18 ASCIDIID^. 



water on rocky bottoms among nullipores, sometimes at low-water 

 mark, but usually in four or five fathoms. (^Stimpson.} 



Grand Manan {Slimpson} ; Straits of Belle Isle {Packard). 



The figures which I have given of this species are drawn by Mr. 

 Morse, from specimens dredged by Dr. Packard. They show the 

 species to vary from a circular to an oblong form, and sometimes 

 to be attached by a short, broad peduncle rather than by its base. 

 The orifices form prominent protuberances on the upper surface. 



Cynthia partita. 



Cynthia partita, Stimpson, Proc. Bost. Soc. N. II. iv. 231 (1852) ; Check Lists, 1. 



Body oblong, or subglobular, attached liy the base. Test hard, 

 strong, coriaceous, rugose, wrinkled in various directions, and of a 

 dark purplish brown color. Apertures square, on prominent emi- 

 nences, opening widely, the branchial being largest. The tubes are 

 very beautifully marked exteriorly by alternating triangular areas 

 of white and purple, arranged as in the sliell of a Balanm ; the 

 white ones having their bases, and the purple ones their apices, on 

 the margin of the aperture. In one instance parallel stripes took 

 the place of triangles. Diameter, one inch. 



It is occasionally dredged in Boston Harbor, west of Governor's 

 Island, in four fathoms, among stones and shells. {Stimpson.) 



Cynthia echinata. 



Plate XXIII. Fig. 326. 



Asr.idia echinata, Linn^.us ; 0. Fabricids, Fauna Gra-nl. 331. — Forbes and Hanlet, 



Br. Moll. pi. C, f. 4. 

 Ci/nthia echinata, Stimppox, Grand Manan, 20, no descr. (1854); Check Lists, 2.— 



Packard, Invert, of Labrador in Mem. Bost. Soc. i. 277 (18G7), no. descr. 



Body circular, adhering by its base, yellowish, or brownish in 

 parts; surface crowded with short, upright, sharp protuberances, 

 from near the top of which radiate about six sharp short bristles. 

 Diameter, one inch. 



The figure is drawn from a specimen preserved in alcohol, col- 

 lected by Dr. Packard. In shape, and in the bristles of the sur- 

 face, it bears some resemblance to Ascidia echinata, Lin., as fig- 

 ured by Forl)es and Hanley, Plate C, Fig. 4, but the star-like 

 bristles on that species are much less crowded and numerous. 



Grand Manan {Stimpson) ; Chateau Bay {Packard). 



