Artskarakter for Ankyroderma Jeffreysii. 
Legemet langstrakt, cylindrisk: Den haleformige For- 
længelse lang. Tentaklerne yderst smaa, forsynet med 3 
Papiller, den midterste størst. Genitalpapillen stor, frem- 
ragende. Kalklegemerne i Huden fremtræde under 3 For- 
mer: Ankere, fæstede til spateldannede Kalkstave, gjennem- 
brudte Kalkplader med Krone, og ovale, vinrøde Legemer, 
placerede i Grupper. Hudens Farve, naar Dyret er levende, 
er grønlig, spillende i det violette med isprængte røde 
Punkter. Kroppens forreste Ende har en hvid pentagonal 
Ring, indenfor denne den hvide Mundskive med hvide Ten- 
takler. Genitalpapillen dels gulhvid, dels stærk gul; den 
haleformige Forlængelse hvid. 
Artskarakter for Ankyroderma affine. 
Den haleformige Forlængelse 
kortere end hos Jeffreysu. Tentaklerne yderst smaa med 
3 Papiller. Genitalpapillen ikke fremsprimgende. Paa 
Hudens Overflade temmelig regelmæssige Rækker af Ankere, 
fæstede til spateldannede Kalkstave. Imellem disse dels 
særegne Kalkgrene, fra hvis Fællesudspring (Midtparti) 
hæver sig enten en treknoppet Krone eller en lang Kalk- 
naal, — dels yderst forskjelligformede, gjennembrudte 
Kalkplader med Krone, og i det dybere Hudlag en stor 
Mængde farvefrie, mere eller mindre afrundede Legemer, 
bestaaende af et Conglomerat af Kalkkorn eller. Kalk- 
prismer. Huden grgnlig; Mundskiven og Halespidsen hvid. 
Legemet cylindrisk. 
Foruden de af Professor Semper i hans Reiseværk 
opstillede Slægter, henhørende til Molpadidernes Familie, 
have vi fundet det nødvendigt at opstille to nye Slægter, 
hvis Hjem er de arctiske Have. Af Molpadider fra disse 
existere (foruden de af os beskrevne), saavidt os bekjendt, 
kun 3 Arter, hvoraf den ene blev fundet ved Vest-Fin- 
markens Kyster, den anden ved Novaja Semblia og den 
tredie ved Nord-Amerika; desforuden forekommer der ved . | 
Kerguelens Land en Molpadide, nemlig Molpadia violacea, 
Studer, som efter al Sandsynlighed er identisk med Sars's 
Molpadia borealis. Saavel denne som Molpadia oolitica, 
Pourt., og Haplodactyla arctica, Marenzeller, maa henføres 
til den af os opstillede Slægt Trochostoma. 
Hvad der frembyder en særlig Interesse ved den af 
74 
Specific Character: Ankyroderma leffreysii. 
Body elongate, cylindric. Caudiform appendix long. 
Tentacles exceedingly small, furnished with 3 papille, that 
in the middle largest. Genital papilla large, projecting. 
The calcareous corpuscles in the skin occur in three typi- 
cal forms: as anchors webbed to spatulate calcareous 
rods; as perforate calcareous plates with a corolla; 
and as oval, vinous-red corpuscles, arranged in groups. 
Colour of skin in living specimens greenish, bordering on 
violet, freckled with reddish specks. The anterior extrem- 
ity of the body marked with a white pentagonal ring, ap- 
proximating which is seen the white oral disk with its 
white tentacula. Genital papilla sometimes yellowish-white, 
sometimes a vivid yellow; caudiform appendix white. 
Specific Character: Ankyroderma affine. 
Caudiform appendix shorter than 
in Jeffreys. ‘Tentacles exceedingly small, with 3 papillæ. 
Genital papilla not projecting. On the surface of the 
skin occur comparatively regular series of anchors, at- 
tached to spatulate calcareous rods. Between the latter, 
are seen characteristic calcareous branches: a three-knobbed 
Body cylindric. 
corolla, or a long calcareous spicule, springing from their 
common origin (the central portion); also perforate calcare- 
ous plates with a corolla, varying greatly in form; and in 
the deepest tegumentary layer large numbers of colourless, 
more or less rounded corpuscles, consisting of a conglome- 
ration of calcareous granules, or calcareous prisms. Skin 
greenish; oral disk and tip of caudiform appendix white. 
Exclusive of the genera established by Professor 
Semper in his “Travels” as belonging to the family Mol- 
padide, we have found it necessary to institute two new 
genera inhabiting the Polar Seas. Three species only 
of Molpadidæ, exclusive of those here described, have their 
habitat, so far as we are aware, in those regions, one of 
which has been met with off the coast of West Finmark, 
the other on that of Nova Zemlja, and the third off the 
shores of North America; a Molpadia occurs, too, off Ker- 
guelen, viz. Molpadia violacea, Studer, which in all pro- 
bability is identical with Sars’s Molpadia borealis. The 
latter, no less than Molpadia oolitica, Pourt., and Haplo- 
dactyla’ arctica, Marenzeller, must be referred to our new 
genus Trochostoma. 
The genus Ankyroderma has proved specially inter- 
