ASCIDIA. 25 



resembles a species which I received from Europe under the name 

 of A. mentn/a, but does not agree with tlic descriptions of tliat 

 species. (Stimpson.^ 



Probably synonymous with the earlier described A. ocellata. 



Ascidia carnea. 



Plate XXIV. Figs. 334, 335. 



Ascidia carnea, Agassiz, Proc. Am. Ass. Adv. Sc. ii. 159 (1850). 



A small species, red-colored, with a smooth body. Lives in deep 

 water, upon shells. Not immature. (^Ag-assiz.') 



The original specimen of this species, from Boston Harbor, was 

 drawn by Mr. Burkhardt. His figure is copied on Plate XXIV. 

 It will fix the species better than any description taken from a 

 drawing alone, which would be unsatisfactory, if not inaccurate. 



Ascidia Manhattensis. 



Ascidia Manhattensis, De Ivat, N. Y. jMoII. 259 (1843). — Stijipson, Check Lists, 2 



(1860). 



Oblong-oval, globular ; orifices distant, elevated, and surrounded 

 by ten to thirteen verrucose processes; externally corrugated, often 

 covered with marine sordes, concealing the natural color. When 

 held against the light, the intestinal canal may be indistinctly 

 traced. The shape varies according as they are crowded together 

 or isolated ; in the latter case they are oval-orbicular. Uniform 

 ashen-gray or brown. Diameter, from three tenths to one inch. 



In the young, the orifices are both terminal. The aperturse in- 

 carnata3 attributed by Liniifeus to the rustica are wanting in this 

 species, and the references to Miiller indicate a very different ani- 

 mal. The ovaUs of Lesueur, another allied species, has the tubes 

 plaited. Our species is commonly found, in the months of Sep- 

 teml)er and October, adhering to stones, dock-logs, and other sub- 

 merged bodies. I refer to it a small Ascidia, about three tenths 

 inch in diameter, adhering to salt grasses. (De Kay?) 



The above description of De Kay does not even estal)lish the 

 generic position of the species. It is, however, admitted as an 

 Ascidia in Dr. Stimpson's Smithsonian Check Lists. 



