168 WORMS. TESTACEA. 52. Bulla. 



52. BULLA. : 



343. B. lignaria. Ohovate, thin, yellowish-brown, with 

 numerous pale transverse striae ; the crown narrower 

 and slightly umbilicate. 



Sr. Zool. t. 70. /. 83. Donovan t. 9.7. Da Costa t. i. /. g. 

 Shell nearly a inches long, with a very large aperture which is 

 contracted at top, white within : pillar flexuous and visible up 

 to the crown. 



344. B. Ampulla. Oblong-oval, smooth, glossy, whitish 

 mottled and varied with light-brown; the crown 

 narrower and slightly umbilicate. 



Montagne Brit. Shell, p. 206. tab. "j.f. \. 



Shell hardly half an inch long, with a wide aperture at bottotta : 

 pillar not visible to the end: spire none. 



345. B. patula. Oblong, glossy white, smooth, length- 

 ened at each end into a canal, slightly umbilicate 

 at top. 



Br. Zool. tab. 70. /. 85. A. Donov. t. 142. descrip. t, 143. 



Shell about an inch long, involute, the aperture narrower to- 

 wards the top, produced at both ends, one end more elongated, 

 with a flat margin: : pillar twisted* 



346. B. aperta. Suborbicular, pellucid, white, faintly 

 striate, almost entirely open. 



Donovan t. 120. /. i. Da Costa tab. 2. /. 3. 



Shell about half an inch long thin, brittle : pillar small, 

 slightly involute, visible to the end. 



341, R. Haliotoidea. Suboval, pellucid, white, slightly 

 striate; the aperture closed at the top where it is 

 twisted sideways into 2 whorls. 



Montague t. "j.J", 6. Vign. 2. f. 6. 



Shell 3 quarters of an inch long, half an inch broad, thin, very 

 open but closed and twisted obliquely at the top. 



^48. B. Plumula. Ovate-oblong, depressed, pellucid, 

 yellowish-white, concentrically wrinkled, almost en- 

 tirely open, rounded and convolute with a single 

 turn at top. 



Montague tab. 15. /. g. fign. a,/. 5. 



Shell half an inch long, a quarter broad, and nearly as broad at 

 top, tinged with brown at one end, Wrinkled Within, open over 

 the whole shell : pillar-lip slightly turned in. 



349. B. Cattna. Ovate, white, pellucid, transversely 

 striate, almost entirely open, obtuse at top with a. 

 single turn. 



Montague t. 7. /. 7. Linn. Trans, v. t. i.f. 6-8.? 



Shell minute, With chain-like striae, slightly umbilicate. 



350. B. emarginata. Pellucid, smooth, gibbous, with the 

 aperture emarginate and the lip slightly arched. 



Adams Linn. Trans, v. tab. i.^f. 9. 10. M. Minute. 



351. B. denticulata. Oblong, white, pellucid, nearly 

 equal, obtuse, smooth; the aperture at top ending 

 in a very acute tooth. 



Adams Lion. Trans, v. tab. i.f. 3. 4, 5. Minute. 



352. B. Hydatis. Oval, brittle, subpellucid, tumid, 



