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75
os beskrevne Slægt Ank yr oderma, er at den danner ligesom
et Led imellem Synaptiderne og Molpadiderne. idet der i
Huden er de for Slægten Synapta saa karakteristiske
An-kere. imedens den foravrigt har Molpadidens Karakter.
For at faa en bedre Oversigt over Arterne af
Slægterne Trochostoma og Ankyroderma, skulle vi nu i Korthed
give en Karakteristik af dem.
Uden Kloak.
Trochostoma Thoinsonii. Tentakler smaa. Hudens
Farve bleg-violet, brunlig Afskygning paa Bupffladen. I
Corium dels ovale, violette eller farvefri, dels elliptiske
mørk*vinrøde Kalklegemer, spredte. imellem de
gjennem-brudte Kalkplader med Krone.
Med Kloak.
Trochostoma boreale, Sars. Tentaklerne smaa. Farven
jevn mørk-violet. I Corium gjenuembrudte Kalkplader med
Krone, indenfor disse et tæt Lag dels ovale, dels mere
runde, mørk-vinrøde Kalklegemer.
Trochostoma arcticum, Marenz. Tentaklerne store med
4—6 Papiller. Hudens Farve graa grøn. spillende lidt i
det violette. I Corium kun gjenuembrudte Kalkplader
med Krone.
Trochostoma (Molpadia) ooliticum, Pourt.
Tentaklerne smaa. Farven violet. I Corium
temmelig store, ovale Kalklegemer. Ingen Kalkplader.
esting, forming as it does, a kind of transition link
between the Synaptidæ and the Molpadidæ; for the skin
is furnished with the anchors so characteristic of the
genus Synapta, whereas in other respects it agrees with
Molpadia.
In conclusion, we will briefly characterize the several
species comprised in the genera Trochostoma and
Ankyro-derma.
Without a Cloaoum.
Trochostoma Thoinsonii. Tentacles small. Colour of
skin pale violet, tinged with brownish on the ventral
surface. Embedded in the corium, and scattered between the
perforate calcareous plates with a corolla, are calcareous
corpuscles, some oval in form, violet or colourless, some
elliptic-shaped, of a dark vinous red.
With a Cloaoum.
Trochostoma boreale, Sars. Tentacles small. Colour
a uniform dark-violet. Embedded in the corium. perforate
calcareous plates with a corolla; underneath the latter, a
compact layer of calcareous corpuscles, some oval, some
roundish, in colour a dark vinous red.
Trochostoma arcticum, Marenz. Tentacles large, with
4—6 papillæ. Colour of skin grevish-green, bordering on
violet. In the corium. only perforate calcareous plates with
a corolla.
Trochostoma (Molpadia) ooliticum, Pourt.
Tentacles small. Colour violet. Embedded in the
corium, comparatively large oval calcareous corpuscles. No
calcareous plates.
Ankyroderma Jeffreysii, n. g., n. sp.
Yderst smaa Tentakler. Hudens Farve violet med
isprængte røde Punkter. Overalt paa Kroppen
gjennem-borede Papiller. Genitalpapillen stærkt fremstaaende. I
Corium stjerneformige Kalklegemer med Ankere, imellem
disse gjennembrudte Kalkplader med Krone, samt
gruppevis ovale, mørk-vinrøde Kalklegemer. .
Ankyroderma Jeffreysii, n. g., n. sp.
Exceedingly small tentacles. Colour of skin violet,
flecked with red. On all parts of the body perforate
papillæ. Genital papilla very projecting. Embedded in
the corium. stellate calcareous corpuscles, with anchors,
between which are perforate calcareous plates with a corolla,
and, grouped together, oval calcareous corpuscles, of a
dark vinous red.
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