of several new Species of Ascidia. 323 



some, and brownish in other individuals, somewhat in appear- 

 ance like a truffle ( Tuba-). — This species lives in society, 

 attached to madrepores, rocks, shells, and each other; 

 grouped with them are smaller ones, of nearly the same form, 

 and of a beautiful red colour; but not having particularly 

 examined these smaller specimens, I am not certain of their 

 being the same species with their larger associates. — Length, 

 about one inch and a half, by one inch in breadth. — Inhabits 

 the bay of the Island of St. Thomas. 



6. A. claviformis. Body small, sub-cylindric, elongated, 

 larger towards the extremity, or sub-clavate, terminated by 

 two small unequal approximate tubercles open at their sum- 

 mit; substance gelatinous, diaphanous, glabrous. It lives in 

 society, attached by the base to fuci and other marine bodies, 

 and is also found thus attached floating on the surface of the 

 water. — Inhabits the bay of St. Vincent in the West Indies. 

 — Length about one inch, breadth 2 lines. 



7. A. plicata. Body ovate, sessile ; surface sub-glabrous, 

 but with many large inflated folds on the side of the inferior 

 aperture, crossed by smaller folds, presenting on that side the 

 appearance of small imbricated dilatations; the remaining 

 part of the body is covered with much smaller folds ; aper- 

 tures approximate, unequal, terminal ; but being much com- 

 pressed by their position in the preserving liquor, I am unable 

 to determine their natural form; substance opaque, readily 

 yielding to pressure ; colour white ; when air is forcibly intro- 

 duced into the body, the latter becomes inflated like a small 

 vesicle. — Length about two inches. — Cabinet of the Academy. 

 — This species was found attached to the bottom of a vessel 

 in this port. See Plate V. fig. B. 



8. A. ovalis. Body sessile, resembling the preceding 

 species, but smaller, less rugged, being destitute of large in- 

 flated folds, with some slight, irregular wrinkles on the sur- 

 face ; apertures large, distant, placed at the extremity of two 

 short, plaited tubes ; the skin which margins the apertures is 

 very thin, and apparently divided into many small obsolete 

 angles ; one of these apertures is placed lower than the other 

 and lateral; colour, m the alcohol, white; nearly the size of 

 plicata. —Cabinet of the Academy. 



The base of this specimen is surrounded by numerous in- 

 dividuals of a species of Lepas, which covered the bottom of 

 the vessel on which it was found. See Plate V. fig. A. 



9. A. proboscidea. An elongated proboscis containing the 

 two tubes ; extremity obliquely truncated on each side ; aper- 

 tures subequal, placed on the summit of the proboscis, and 

 separated only bv a membrane, which extends the whole 



S s 2 length 



