18 ASCIDIID^. 



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

 mark, but usually in four or five fatboms. {Stimpson.) 



Grand Manan {Stimpsoti^ ; Straits of Belle Isle (^PackarcC). 



Tlic figures wliicli I bave given of tliis species are drawn by Mr. 

 Morse, from specimens dredged by Dr. Packard. Tbey sbow tlie 

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

 to be attacbed by a sbort, broad peduncle ratbcr tban l)y 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, attacbed by the base. Test bard, 

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

 dark purplish brown color. Aj^ertures square, on ])romincnt 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 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. (^StimpsonS) 



Cyntliia echinata. 



Plate XXIII. Fig. 326. 



Ascldia echinata, Linn^us; 0. Fabricius, Fauna Gra'iil. 331. — Fonr.ES and Hanlet, 



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

 Ci/nthia echinata, Stimpson, Grand Manan, 20, no descr. (18.")4) ; 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 croAvded with short, upright, sharp ])rotuberances, 

 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 Ascldia echinata, Lin., as fig- 

 ured by Forlics and Hanley, Plate C, Fig. 4, but Ihc star-like 

 bristles on tliat species are much less crowded and numerous. 



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



