18 ASCIDITD^. 



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

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



Grand Manan (Stimpson) ; 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 })rominent protuberances on the up}jer surface. 



Cynthia partita. 



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



Body oblong, or subglol)ular, attached by the base. Test hard, 

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

 darlv purplisli Ijrown color. Apertures square, on ])roniincnt emi- 

 nences, opening widely, the branchial 1)eing largest. Tlie tubes are 

 very beautifully marked exteriorly by alternating triangular areas 

 of white and purple, arranged as in the shell of a Balanus ; 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. {Stiinpson.} 



Cynthia echinata. 



Plate XXIII. Fig. 326. 



Ascidia echinata, Linn.f.us ; O. Fabricius, Fauna GroL'nl. 331. — Forbes and Hanley, 



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

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



Packard, Invert, of Labrador in Mem. Bost. Soc. i. 277 (1867), no. dcscr. 



Body circular, adlicring by its liase, yclloAvish, or brownish in 

 parts ; surface crowded with sliort, upright, sharp jn-otuljcrances, 

 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 Forbes and Hanley, Plate C, Fig. 4, but tlic star-like 

 bristles on tliat species are much less crowded and numerous. 



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



