222 BULLION. 



Foimd by Professor Adams in the mud of New Bedford Harbor. 

 It was originally found by Colonel Totten in the harbor of New- 

 port. 



Maine (Mig-hcls) ; New Bedford (^Stimpsoti) ; Connecticut (Lins- 

 ley). Fossil, Montreal (^Dawson) ; Buzzard's Bay, southward 

 (^titiinpson). 



In solidity, color, polish, and general shape, this is allied to Utric- 

 ulus Gouldii; but is much smaller, and is at once distinguished 

 by its exhibiting no spire. 



Cicnus BULLiA, Lin. 1759. 



Eyes conspicuous, sessile on the middle of the frontal disk. Man- 

 tle with the outer margin forming a thick, fleshy lobe. Foot with 

 the lateral lobes moderate, and the hind part not extending beyond 

 the shell. 



Shell convolute, ovate or sub-globose, smooth, mottled ; spire in- 

 volute, sunken, causing the apex to be tubular or perforate ; aper- 

 ture extending the entire length of the body whorl ; inner lip sim- 

 ple ; columella none ; outer lip acute. 



Bulla incincta. 



Bulla incincta, Migiiels, Proc. Bost. Soc. i. 188 (1844). — Stimpson, Check Lists, 4 

 (18G0). 



Shell small, cylindrical, o]mque, white ; whorls three, the first 

 slightly depressed, the last distinctly girded above the middle ; epi- 

 dermis yellowish ; spire obtuse, elevated ; suture canaliculate ; aper- 

 ture narrow behind, wide and rounded before ; right lip sharp, 

 entire, advanced in the central region, with a fissure posteriorly. 

 Length, tliree twenty-fifths of an inch ; breadth, three fiftieths of 

 an inch. Casco Bay (3Iig-hels}. 



Bulla solitaria. 



Fig. 92. 



Shell oval, bluish-white, frap^ile, the last Avhorl enveloping all the others, and 

 covered with minute, regular, revolving lines, with an imperfect opening in the 

 region of the spire. ' 



Bulla in:^riilpta, Tottkn, Silliman's Jonrn. xxviii. 350, fig. 4. — Gould, Inv. 162, fig. 92. 

 -De Kay, N. Y. Moll. 14, pi. 5, fig. 100. 



