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51
tæt børstebesatte Lcd. Det midterste Halevedhæng næsten
qvadratisk, kun lidet længere end bredt, med Sidekanterne
i den bagre Halvpart forsynede med smaa Torner; det
bagre Indsnit bredt, vinklet, med Kanterne tint saugtakkede;
Endelapperne tilspidsede og bevæbnede med en enkelt apical
Torn. De ydre Halevedhængs indre Plade kortere end den
ydre og langs den indre Kant under Randbørsterne tæt
tandet. Hele Legemet gjennemsigtigt, af hvidagtig Farve,
uden Spor af Pigmentering.
Findesteder. Ståt. 295, 297.
Bemærkninger. Den i min Prodromus givne
Diagnose er kun affattet efter det under vor Expedition tagne
enkelte Exemplar, paa hvilket forskjellige i systematisk
Henseende vigtige Dele manglede eller var ufuldstændige.
Længe efter Expeditiouens Afslutning og efterat nærværende
Afhandling allerede var paabegyudt. blev imidlertid af R.
Collett i Ventrikelen af den mærkelige nye Dybvandstisk,
Bhodichthys regina, Coll., fundet Levningerne af et andet
Exemplar af samme Art, paa hvilket saavel Antennebladene
som samtlige Fødder var i Behold. Jeg har herved i
enkelte vigtige Punkter kunnet supplere min tidligere
Char-acteristik af nærværende interessante Myside og har paa
sidste Planche vedføiet de fornødne Figurer.
Beskrivelse. Da begge de foreliggende Exemplarer,
som ovenfor bemærket, er i en stærkt mutileret Tilstand,
bliver det temmelig vanskeligt med Sikkerhed at bestemme
Legemets almindelige Form. Den synes imidlertid, efter
de erholdte Levninger at domme, at have været forholdsvis
undersætsig og nærmest lignende samme hos Arterne af
Slægten Mysideis, G. O. Sars.
Bygskjoldet er forholdsvis stort og synes fuldstændigt
at have dækket Forkroppen. Det er fortil (se PL V. Fig.
13, og PL XX. Fig. 18) betydelig bredere end Bagkroppen
og viser foran Midten en tydeligt markeret buet
Cervical-fure. Pandedelen springer stærkt frem og er i Midten
udtrukken i en skalp tilspidset, rostrunilignende Fortsats. der
rækker næsten til Midten af 1ste Par Føleres Basalled.
Øiuene (ibid.) er ganske og aldeles rudimentære, kun
dannende et Par skraat udadrettede, stumpt koniske
Fort-satser, uden det mindste Spor af Pigmet eller Synselemeuter.
Ved den stumpt tilrundede Ende. der ikke rækker ud
over Rygskjoldets Sidekanter, tindes fortil et lidet
tand-formigt Fremspring.
1ste Par Føleres Skaft (ibid.) er temmelig kraftigt
bygget, cylindriskt og omtrent af samme Længde som
Rygskjoldets Brede fortil. Af dets 3 Led er 1ste og sidste
omtrent lige store, medens det 2det er ganske kort.
Svøberne var vistnok paa begge Exemplarer
incom-plette; men efter det bevarede basale Parti lader sig dog
slutte, at de har været af temmelig betydelig Længde.
2det Par Føleres Blad var paa det ene større
Exemplar (PI. V, Fig. 13) paa begge Sider defect, idet den
ydre Del var afbrukket. Derimod var det paa det andet
mindre Individ (PL XX, Fig. 18) uskadt og forsynet med
and divided into 7 or 8 short articulations, densely beset
with bristles. Telson well-nigh quadrate, but very little
longer than broad, armed in the posterior half with small
marginal denticles; posterior incision broad, angular, with
the edges finely serrate; the terminal lobes pointed and
armed with a single apical spine. Inner plate of outer
caudal appendages shorter than outer, and, along the inner
margin, closely dentate beneath the bristles. Whole body
translucent, and whitish, without any trace of pigment.
Locality. — Stats. 295, 297.
Remarks. — The diagnosis given in my Prodromus
was worked up exclusively from the solitary specimen taken
on the Expedition, in which however several systematically
important parts were either entirely wanting or incomplete.
Long after the close of the Expedition, and after the present
Memoir had been commenced. Mr. B. Collett found in the
ventricle of the remarkable deep-sea fish, EhodicMhys regina,
Coll., the remoins of another specimen of the same species,
in which both the antennal scales and all the feet remained
intact. Hence, I have, with regard to several important
points, been enabled to supplement my original characteristic
of this interesting form, and on the last plate have annexed
the necessary figures.
Description. — Both of the specimens secured being,
as mentioned above, in a very mutilated condition, it is a
matter of some difficulty to determine the general form of
the body. This, however, judging from the remains found
on the Expedition and by Mr. Collett, would appear to be
comparatively thickset, approximating closest that in the
two species of the genus Mysideis, G. O. Sars.
The carapax is comparatively large, and would appear
to entirely cover the cephalo-thorax. Anteriorly (see Pl. V,
fig. 13, and Pl. XX, fig. 18), it is much broader than the
posterior division, and exhibits, anterior to the middle, a
well-defined, arcuate cervical groove. The frontal part juts
prominently forward, and is drawn out as a sharp-pointed,
rostrum-like projection, reaching almost to the middle of
the basal joint of the 1st pair of antennæ.
The eyes (ibid.) are in every sense rudimentary,
forming merely a pair of obtuse, conical probations, directed
obliquely outward, without the slightest trace of pigment
or visual elements. At the obtusely rounded extremity, which
does not reach above the lateral margins of the carapax,
occurs anteriorly a small dentiform projection.
The peduncle of the 1st pair of antennæ (ibid.)
comparatively powerful in structure, cylindric. and about as long
as the carapax is broad anteriorly. Of its 3 joints, the
first and last are about equal in size, while the second is
exceedingly short.
The flagella were in both specimens. incomplete; but.
judging from the basal portion, their length may be inferred
to have been considerable.
The scale of the 2nd pair of antennæ was in the
larger example (Pl. V, fig. 13) on either side defective, the
outer portion having been broken off’. In the smaller
specimen (Pl. XX. fig. 18), it was wholly uninjured and
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