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Findested. Ståt. lU. 2 Exemplarer, begge Hunner.
Bemærkninger. Hvorvidt den lier omhandlede Form
i Virkeligheden er specitisk forskjellig fra Stimpsons Scyra
umbonata, er det vanskeligt for Tiden med fuld Sikkerhed
at afgjøre, da der endnu ikke foreligger nogen udførlig
Beskrivelse eller Afbildning af denne sidste. Stimpson’s korte
Diagnose passer i alt væsentligt temmelig godt paa vor Art,
saa at det neppe herefter lader sig gjøre at udhæve for
denne sidste nogen egentlig distinctiv Character ligeoverfor
den amerikanske Fonn.
Skjøndt jeg for min Part skulde være meget tilbøielig
til at ause disse to Former for identiske, tror jeg dog ikke
paa Basis heraf udenvidere at kunne reducere Norman’s
Art, saalænge der endnu ikke er foretaget nogen nøiere
Sammenligning mellem begge de her omhandlede Former.
Den opføres derfor her uuder det af Norman foreslaaede
Artsnavn.
Beskrivelse. Hele Legemets Overflade er ligesom
beklædt med et tæt filtagtigt Belæg, der ved nøiere Undersøgelse
bestaar af 2 forskjellige Slags Hudvedhæng. Inderst bemærkes
talrige smaa tæt sammentrængte knudeformige Udvæxter, der
ved en flygtig Betragtning let vilde kunne tages for
Granulationer ’af selve Hudskelettet, men som nærmere beseede
snart viser sig at være af en helt anden Natur, da de baade
er af temmelig blod Consistens og med den største Lethed
lader jeg skrabe af. Ved Behandling med Kalilud viser
de sig (se Fig. 7) som hudagtige Blærer eller Kapsler,
der med en bred Basis er fæstede til Hudskelettet og i
Midten støttes af en tynd chitingagtig Stav, hvis Spids
rager mere eller mindre tydeligt frem fra Toppen.
Imellem disse eiendommelige Hudvedbæng og
betydeligt overragende dem staar korte, men stive og i Enden
noget hageformigt krummede Haar (Fig. 6), der især er
tæt sammentrængte paa den forreste Del af Bygskjoldets
dorsale Flade, der herved faar et eget fløielsagtigt Udseende.
De savnes imidlertid heller ikke paa andre Dele af Legemet,
saasom Pandehornene, Lemmerne og Bagkroppen, skjøndt
de ialmindelighed her er noget mere spredte.
Rygskjoldet viser (se Fig. 1) den for Oxyrhyncherne
cliaracteristiske afrundet trekantede Fonn, med Længden
noget større end Breden og den bagre Kant i Midten
tem-meMg stærkt udbuet. Dets Overflade er noget ujevn, uden
at dog de forskjellige Regioner markerer sig synderbgt
skarpt fra hverandre. Tydeligst er Begrændsningen mellem
Maveregionen og Gjelleregionerne, hvilken viser sig som to
dybe, bagtil convergereude Furer omtrent ved Midten af
Rygskjoldets Længde. Seet i Profil (Fig. 3) viser
Ryg-fladen sig stærkt hvælvet og temmelig bråt nedadskraanende
saavel mod Panden som den bagre Rand.
men large and broad, almost circular, with an obtuse carina
along the middle. Colour a uniform dirty greyish-brown.
Width between the points of the outstretched legs reaching
250""".
Locality. — Station 10: 2 specimens, both females.
Remarks. — Whether the form treated of here be
indeed specifically distinct from Stimpson’s Scyra umbonata,
is difficult to decide at present with absolute certainty,
since a detailed description or representation of the latter
has not yet been given. Stimpson’s brief diagnosis agrees
well in all essential particulars with our species; and hence
it is hardly possible to assign a pronounced distinctive
character as contrasting with the American form.
Though myself greatly disposed to regard these two
forms as identical. 1 cannot, on the basis of a mere
supposition, presume to reduce Norman’s species, till a further and
more minute comparison shall have been made between the
two forms treated of here. Hence, it is described under
the specific name suggested by Norman.
Description. — The whole surface of the body invested,
as it were, with a dense, felt-like covering, which, on closer
inspection, is found to consist of two different kinds of
cutaneous appeudages. Innermost, crowded together, are
observed numerous small tuberculiform excrescenses, which, at
the first glance, may be readily taken for granulations on
the skeleton of the skin, but, after a closer examination,
are seen to be of a totally different character, since they
have not only a soft consistence, but admit of being scraped
off with the greatest facility. On treating these
protuberances with a solution of potash, they are found (see fig.
7) to be true cutaneous vesicles or capsules, that, with
a broad basis, are attached to the skeleton of the skin and
supported in the middle by a slender chitinous-like rod. of
which the point projects more or less distinctly forward
from the top.
Between these peculiar cutaneous appendages, and
projecting considerably beyond them, are short and comparatively
still’ hairs (fig. 6), somewhat unguiform at the extremity. and
crowded together, in particular on the anterior part of the
dorsal surface of the carapax, which thus acquires a velvety
appearance. These hairs, though not wanting on other
parts of the body, for example the rostrum, the legs, and
the abdomen, occur here as a rule somewhat more scattered.
The carapax (see fig. 1) exhibits the rounded
triangular form characteristic of the Oxyrhyncha, with the
length somewhat greater than the breadth, and the posterior
margin slightly arcuate in the middle. Its surface is
somewhat uneven, but without the various regions of the
body being sharply defined one from the other. The
demarcation is most distinct between the gastric and the
branchial regions, occurring here as two deep, posteriorly
converging furrows about the middle of the longitudinal diameter of
the carapax. Viewed in profile (fig. 3), the dorsal surface
has an exceedingly curved appearance, sloping abruptly down
alike towards the rostrum and the posterior margin.
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