75 
os beskrevne Slegt Ankyroderma, er at den danner ligesom 
et Led imellem Synaptiderne og Molpadiderne, idet der bi 
Huden er de for Slægten Synapta saa karakteristiske An- 
kere, imedens den forøvrigt har Molpadidens Karakter. 
For at faa en bedre Oversigt over Arterne af Slæg- 
terne Trochostoma og Ankyroderma, skulle vi nu i Korthed 
give en Karakteristik af dem. 
Uden Kloak. 
Trochostoma Thomsomii. Tentakler smaa. Hudens 
Farve bleg-violet, brunlig Afskygning paa Bugfladen. 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 gjennembrudte Kalkplader med 
Krone, indenfor disse et tæt Lag dels ovale, dels mere 
runde, mørk-vinrøde Kalklegemer. 
Tentaklerne store med 
graagron, spillende lidt i 
gjennembrudte Kalkplader 
Trochostoma arcticum, Marenz. 
4—6 Papiller. Hudens Farve 
det violette. I Corium kun 
med Krone. 
Trochostoma (Molpadia) ooliticum, Pourt. 
I Corium temme- 
Ingen Kalkplader. 
Tentaklerne smaa. Faryen violet. 
lig store, ovale Kalklegemer. 
 Ankyroderma Jeffreysii, n. g., n. sp. 
' Yderst smaa Tentakler. Hudens Farve violet med 
isprængte rode Punkter. Overalt paa Kroppen gjennem- 
borede Papiller. Genitalpapillen stærkt fremstaaende. I 
Corium stjerneformige Kalklegemer med Ankere, imellem 
disse gjennembrudte Kalkplader med Krone, samt gruppe- 
vis ovale, mørk-vinrøde Kalklegemer. 
esting, forming as it does, a kind of transition link be- 
tween the Synaptide and the Molpadide; 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 Cloacum. 
Trochostoma Thomsonii. Tentacles small. Colour of 
skin pale violet, tinged with brownish on the ventral sur- 
face. Embedded in the corium, and scattered between the 
perforate calcareous plates with a corolla, are calcareous cor- 
puscles, some oval in form, violet or colourless, some ellip- 
tic-shaped, of a dark vinous red. 
With a Cloacum. 
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 greyish-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. 
Exceedingly small tentacles. 
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. 
Colour of skin violet, 
10* 
