46 Mr. Broderip and Mr. G. B. Sowerby on Mollusca. 
phreys, near Cork. 1 have before me another individual of larger size 
(one inch Z long. and about Z of an inch broad), but it is very much 
worn. This last came from the collection of Mr. Bennett. The species 
approaches in general appearance to some of those Fusi which have a 
short canal. 
Art. XI. Observations on new or interesting Mollusca, con- 
tained, for the most part, in the Museum of the Zoological 
Society. By W.J.Broperip, Esg., F.R.S., &e., Sec. 
G.S., and G. B. Sowxrsy, F.L.S., &c. 
(Continued from Vol. IY. p. 379.) 
Group. 
Tunicata. 
Family. 
Genus. 
CHELYOSOMA. 
Corpus sessile, fixum testa coriaced superné diviso-laminatd indutum. 
Orificia conica, utrumque valvulis 6 trigonis clausum. 
Specific Character. 
Cuetyosoma MacLEAyYANum. 
Ch. elongato-ovatum, basi afficum, superné planum, octopartitum, 
laminis striatis, ovifictis prominentibus. 
Hab. in Oceano Arctico, saxis adherens. 
Taz. III. fig. 4, 5, 6. 
This extraordinary inhabitant of the Arctic Seas appears to differ from 
any of the Tunicata already described. It comes nearest to those Mol- 
lusca which form Mr. MacLezay’s group Tethya, but there are no traces of 
tentacula surrounding the branchial orifice. From the Thalida it differs, 
inasmuch as the mantle seems to adhere to the orifices only, and, instead 
of a simple valvule, each orifice of Chelyosoma is furnished with a 
complicated one. From the Ascidide, the only simple and fixed fa- 
mily of the Tethya, according to MacLeay, it differs, inasmuch as both 
its orifices are surrounded by six valves, instead of being quadrifid. 
