ASCIDIA. 25 



resembles a species which I received from Europe imder the iicame 

 of A. mc/itula, but does not agree with the descriptions of that 

 species. {Stimpson.^ 



Probably synonymous wnth the earlier described A. occllaia. 



Ascidia carnea. 



Plate XXIV. Figs. 3.34, .33.5. 

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



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

 water, ui)on shells. Not immature. (^Agassiz.) 



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 si»ecics better than any description taken from a 

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



Ascidia Manhattensis. 



Ascidia Manhattensis, De Kay, N. Y. j\Io11. 259 (1843). — Stimpson, Check Lists, 2 



(18G0). 



01)long-oval, glolnilar; orifices distant, elevated, and surrounded 

 by ten to thirteen vcrrucose 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 sluipe varies according as they are crowded together 

 or isolated; in the latter case they are oval-orl)icular. Uniform 

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



In the young, the orifices arc Ijoth terminal. The aperture in- 

 carnata; attributed by LiniiiBus to the rustica are wanting in this 

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

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

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

 tember and October, adhering to stones, dock-logs, and other sub- 

 merged l)odies. 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 establish the 

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

 Ascidia in Dr. Stimpson's Smithsonian Check Lists. 



