19 



kan trækkes over Mundskiven. Denne er stærkt hvælvet 

 og forsynet med 24 Folder, der udgaa straaleformigt fra 

 Mundaabningen til Tentakelranden. Tentaklerne 24, retrak- 

 tile, korte, sidde i en Række paa Kroppens øverste Rand. 

 Farven: Krop og Fod næsten hvid med et blegt Rosen- 

 skjær. Mundskiven sniuk laxerød med lidt mørkere Straa- 

 ler. der udgaa fra Mundaabningen. Tentaklerne lidt lysere 

 end Mundskiven. 



Stelidiactis Tubulariæ. n. sp. 



Tab. II. Fig. fi, 7; Tab. VIII, Fig. 12. 



Fodskiven er aflang, 25""" lang. temmelig tynd med 

 enlappetRand og siddende paa et uddødt Rør af Tubularia 

 imperialis saaledes, at en stor Del af Fodskivens Underflade 

 sees. Tab. II. Fig. 6, 7: Tal,. VIII, Fig. 12. Den omfat- 

 ter ikke som den foregaaende Art ganske Gjenstanden, 

 hvorpaa den sidder, og den er heller ikke limet til denne 

 ved en afsondret, klæbende Masse, saa at Dyret med tem- 

 melig Letbed kan bevæge sig paa Koret, hvilket jo ikke er 

 Tilfældet med Stelidiactis Mopsiæ. 



Kroppen er cylindrisk, 20""" lioi. glat, glindsende og 

 lidt indsnøret paa Midten, hvorved den nærmer sig noget 

 Timeglasformen, Tab. II. Fig. 6. 7; Tab. VIII, Fig. 12; 

 paa dens nederste Del sees nogle faa. yderst smaa, lidt 

 afiange Fordybninger (Spalter, Cinclides?), der synes at 

 perforere Huden. 



Mundskiven er rund. 20""" bred. stærkt hvælvet, for- 

 synet med 48 tine Folder, der udstraale fra Mumien, og 

 hvoraf 24 strække sig lige hen til den indre Tentakelrække, 

 imedens de andre 24 naa kun halvt paa Skiven. Munden 

 er næsten rund. stærkt fremspringende med tykke Læber 

 og i hver Mundvig en stor Gonidialknude. Tab. VIII, 

 Fig. 12. 



Tentaklerne ere retraktile, sidde i Mundskivens Peri- 

 pheri og danne 2 afvexlende Rækker, 24 i hver. De ere 

 temmelig korte, og de i den indre Række ere baade lidt 

 tykkere og længere. end de i den ydre Række. Mund- 

 skiven med de indtrukne Tentakler kan ganske dækkes af 

 Kropsranden. Saavel Kroppen som Mundskiven er tem- 

 melig gjennemsigtig. Farven: Perlemorglindsende rosenrød. 

 Tentaklerne. især de i den indre Række, ere noget mør- 

 kere oa: omgivne af en hoirod Rine. 



margin is thick. tentacular. and may be drawn over the 

 oral dise. The latter strongly areuate. and firrnished with 

 24 folds issuing. radially. from the oral aperture to the 

 tentacular margin. 24 tentacles, retractile, short, seated 

 in one series on the uppermost margin of the body. Colour. 

 Body and base almost white, with a pale rose tinge. The 

 oral dise a beautiful salmon-red colour, with slightly darker 

 rays issuing from the oral aperture. The tentacles sonie- 

 what lighter in colour than the oral dise. 



Stelidiactis Tubulariæ, n. sp. 



IV II. figs. 6, T: Pl. VIII. fig. I'.'. 



The pedal dise oblong, measures 2. r )""" in length. is 

 rather thin, lias a lobate margin, and is seated on a life- 

 less tube of Tubularia imperialis in such manner that a large 

 part of the under-surface ut' the pedal dise is visible (Pl. 

 II, figs. li. 7. Pl. VIII. fig. 12). It does not. like the 

 preceding species. quite enclasp the object upon which it is 

 seated, neither is it glued to it by a deposited glutinous 

 mass. so that the animal can, with considerable ease, move 

 itself upon the tube. which is certainly not the case with 

 Stelidiaetis Mopsiæ. 



The body is eylindrical. 20"™ in height. sinooth. 

 shining, and somewhat constricted at the middle, which 

 imparts to it somewhat the form of a sand-glass (Pl. II. 

 figs. (5. 7; Pl. VIII. rig. 12); upon its lowest part, there 

 are seen a few extremely minute. slightly oblong depres- 

 sions (fissnres, cinclides?) which appear to perforate the 

 integument. 



The oral dise is round, 20 mm in breadth, strongly 

 areuate. furnished with 4* fine folds that radiate from 

 the mouth, and of which 24 extend themselves right up to 

 the in ner tentacular series, whilst the other 24 reach only 

 half way on to the dise. The mouth is almost round, strongly 

 protuberant, with thick labiæ, and in each oral angle 

 there is a large gonidial knot (Pl. VIII. fig. 12). 



The tentacles are retractile, are seated on the peri- 

 phery of the oral dise, and form 2 alternating series. 24 

 tentacles in each. They are rather short, and those of 

 the innermost series are both somewhat thicker and longer 

 than the tentacles of the outer series. The oral dise with 

 the retracted tentacles. is capable of being quite covered 

 by the margin of the body. Both the body aud the oral 

 dise are pretty transparent. The colour. Rosy-red, with 

 mother-of-pearl lustre. The tentacles. especially those of 

 the inner series, are somewhat darker in colour and are 

 surrounded bv a bright-red annulus. 



