46 Mr. Broderip and Mr. G. B. Sowerby on Mollusca. 



phreys, near Cork. 1 have before me another individual of larger size 

 (one inch ^ long, and about >- 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. Ohservatio7is on new or interesting Molhiscay can- 

 tained, for the ynost part, in the Museiim of the Zoological 

 Society. By W. J. Broderip, Esq., F.R.S., b)C., Sec. 

 G.S., and G. B. Sowkrby, F.L.S., ftc. 



(Continued from Vol. IV. p. 379.) 



Group. 



Tunicata. 



Family. 



Genus. 



Chelyosoma. 



Corpuj sessile, fixvm testd coriaced supernk diviso-laminatd indutum. 

 Orificia conica, utrumque valvalis 6 trigonis clausum. 



Specific Character. 

 Chelyosoma MacLeayanum. 

 Ck. elongato-ovatum, basi affixnm, superne planum, uctopartitum, 

 laminis striatis, orificiis prominent ibus. 

 Hah. m Oceano Arctico, saxis adhaerens. 



Tab. 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. MacLeay'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 Chelyosoina is furnished with a 

 complicated one. From the Ascididee, 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. 



