304 INVERTEBRATA OF MASSACHUSETTS. 



with enamel, which rises up by the side of an umbihcal depres- 

 sion ; beak short, shghtly curved ; throat of various hues from 

 light violet, to dark chocolate ; operculum horny, rounded ovate, 

 elements concentric ; the nucleus near one edge. Length 1 inch, 

 breadth - inch, divergence 50^. 



Found on rocks in bays and inlets, about Nantucket, New Bed- 

 ford, &c., and occasionally sheltered under the edges of stones in 

 Boston harbour. I am not aware that it is found to the north of 

 Cape Ann, while it is common at the South, and grows to a puich 

 larger size. 



Animal small, foot scarcely covering the aperture, very little 

 dilated at the front angles, cream-colored, margined with lemon- 

 color beneath, punctured with light drab above ; siphon merely 

 surpassing the tip of the canal ; head scarcely protruded ; tenta- 

 cula nearly united at origin ; eyes black, at the outer upper third 

 of tentacula, which third is a mere filament, contractile. Motions 

 sluggish. 



Mr. Say noticed that its habits were those of Pu'rpura ; but it is 

 removed from both Fusus and Pu'rpura by its operculum, and will 

 probably prove to belong to the genus Po'llia of Gray. Mr. Say's 

 specific name is pre-occupied by another species of Bu'ccinum. 



Bu'cciNUM Donova'ni. 



Shell ovate-conic^ elevated and pointed ; whorls folded length- 

 icise, and marked with revolving lines ; the lowest tvhorl is encircled 

 by a rounded carina ; aperture rounded, lip spreading. 



Figure 20S. 



State Coll., No. 165. Soc. Cab., No. 2378. 



Buccinum glaciale, Donovan ; Brit. Shells, v. pi. 154. Brown; Conch, of Great 



Brit., &,-c., pi. 49, f. 12, 13. 

 Bucciiuini Donovani, Grav ; in Zool. to Beecheys Voyage, 128. 



Shell ovate-conic, spire elevated and pointed, soHd, of a livid 

 brownish-color, folded obliquely lengthwise, the lower whorl being 

 merely plaited at the suture, and covered with rather coarse re- 

 volving lines ; whorls seven or eight, moderately convex, and 



