141 



PHASCOLOSOMA STB0MB1 VABIETAS 

 VEBBUCOSUM, Nobis. 



Kroppen cylindrisk, omtr. 20 Mm. lang; den bagerste 

 Ende afstumpet og overalt besat med store conisk til- 

 spidsede Papiller, der ved Grunden af Snabelen og den 

 bagerste Kropsende ere end større og staa tættere sam- 

 men. Snabelen omtrent saa lang som Kroppen, paa dens 

 forreste Ende forsynet med 6 — 8 Ringe med korte, af- 

 stumpede Hager. Tentaklerne omkring 20. Huden halv- 

 gennemsigtig. Den indre Bygning svarer i det Væsent- 

 lige til Hovedformen med Undtagelse af, at de to Re- 

 tractorer ikke udspringe ganske i Kropsbunden, men nogle 

 Mm. længere fortil. 



Farven varierer meget, dels gulhvid, dels svag gul- 

 grøn med et mørkegrønt Belte paa den bagerste Ende 

 og ved Grunden af Snabelen. Fundet i Korsfjorden og 

 Bergensfj orden, tildels i Dentalium entale paa sandig 

 Bund, 100—200 Favnes Dyb. G. O. Sars har fundet den 

 i Hardangerfjorden. 



ONCHNESOMA, 1 ) Nobis. 

 SLÆGTSCHARACTER. 

 Kroppen liden, pæreformig. Snabelen lang. Anal- 

 aabningen lidt foran Snabelens Grund. Ingen Tentakler. 

 Intet Karsystem. En Retractor. 



*) Denne af os opstillede Slægt, der er dannet af "oyx y Vi Pære, 

 øgSjuot, Legeme, nærmer sig Grubes Anoplosomatum; men det maa 

 være os tilladt at bemærke, at Grubes Slægt, der er beskrevet efter 

 et i Spiritus mindre godt conserveret Exemplar, er saa svævende 

 i sine Charactermærker, at vi ikke have kunnet henføre Onchne- 

 soma til den. Imidlertid forekommer det os, at Grubes Slægt Ano- 

 plosomatum er fuldstændig misforstaaet af flere senere Forfattere, 

 saasom Keferstein, Diesing, Quatrefages, idet de iblandt Slægtscha- 

 ractererne angive en „Terminalanus." Grube siger udtrykkelig: 

 „Anus ender i Sidevæggen, noget foran Dyrets bagerste Ende," 

 der er forsynet med en Porus, som fører ind i Kropshulheden. 

 Denne Porus er det, hine Forfattere have kaldt Analaabning; men 

 Grube har aldrig benævnt den saaledes. Det er ikke alene Slægten 

 Anoplosomatum, der er tvivlsom, men ogsaa enkelte af de opførte 

 Arter ere meget usikkre, som f. Ex. Kefersteins Anopl. antillense, 

 Steenstrup. Denne Art er ifølge Meddelelser fra Dr. Lütken ingen 

 Gephyré; men uden al Tvivl Polyperne af Physalia Arethusa. Lüt- 

 ken udtrykker sig saaledes : „Det er ganske rigtigt, at Glasset med 

 disse Skabninger i sin Tid er sendt Keferstein tilligemed det øv- 

 rige sipunculuslignende Materiale under hint Navn Anoplosomatum 

 antillense, hvorunder det henlaa i Samlingen; men dette Navn 

 hidrører ialfald ikke fra Steenstrup, — fra hvem er det ikke mu- 

 ligt at oplyse, da vore Sipunculider i Tidens Løb ere blevne un- 

 dersøgte af mange, der have noteret deres Bestemmelser paa Eti- 

 ketterne." 



PHASCOLOSOMA STBOMBI VABIETAS 

 VEBBUCOSUM, Nobis. 



The body cylindrical, about 20 Mm. long; the pos- 

 terior end truncated, and everywhere covered with large, 

 conically tapered papillæ, which at the base of the pro- 

 boscis and at the posterior end of the body, are still 

 larger and stand more closely together. The proboscis, 

 about as long as the body, has on its anterior extremity 

 6—8 rings of short obtuse hooks. The tentacles about 

 20. The skin semi-transparent. The interior structure 

 corresponds in essential points to that of the main form, 

 with the exception that the two retractors do not issue 

 quite from the end of the body, but a few Mm. further 

 forward. 



The color varies considerably: it is sometimes yel- 

 lowish white, sometimes light yellowish green, with a 

 dark green belt on the posterior end, and at the base 

 of the proboscis. Found in the Korsfjord and in the 

 Bergensfjord, sometimes in Dentalium entale on sandy 

 bottom, at the depth of 100—200 fathoms. Gr. O. Sars 

 has found it in the Hardangerfjord. 



ONCHNESOMA, 1 ) Nobis. 

 GENERIC CHARACTERISTICS. 

 The body small, pear-shaped. The proboscis long. 

 The anal aperture a little in front of the base of the 

 proboscis. No tentacles; no vascular system. One re- 

 tractor. 



') This genus established by us, is named from "oyx^Vi Pear, 

 and office, body; it resembles Grube's Anoplosomatum; but we must 

 be allowed to remark, that Grube's genus, which is described 

 according to a specimen not very well preserved in spirit, is so 

 vague in its characteristics, that we have not been able to class 

 the Onchnesoma in it. However it appears to us that Grube's 

 genus Anoplosomatum has been completely misunderstood by several 

 later authors, as for instance Keferstein, Diesing, Quatrefages; for 

 they mention among the generic characteristics, a „terminal anus." 

 Grube says expressly: „The anus terminates in the side-wall some- 

 what in front of the posterior extremity of the animal, which has 

 a porus leading into the perivisceral cavity," It is this porus which 

 the said authors have called an anal aperture; but Grube has 

 never given it that name. It is not only the genus Anoplosomatum, 

 which is doubtful, but also some of the species mentioned are very 

 uncertain, as for instance Kefersteins Anopl. antillense, Steenstrup. 

 This species is according to communications from Dr. Lütken no 

 Gephyrea, but without any doubt the polyps of Physalia Arethusa. 

 Lütken expresses himself thus: „It is quite true that the glass with 

 these creatures was sent at the time to Keferstein, together with 

 the other preserved things of sipuncular nature, under that name 

 Anoplosomatum antillense, which it bore in the collection; but the 

 name does not in any case come from Steenstrup, — from whom it 

 is not possible to ascertain; as our Sipunculides have been in the 

 course of time examined by many who have noted their name on 

 the labels." 



