496 BULLA. 



bicarinata. 55. Shell ovate, obtuse, ventricose, 

 with the whirls reversed and bicarinated ; 

 pillar truncated. 



Bulimus bicarinatus. Bruguiere Enc. Meth. p. 359' 



Bulla Zebra, Var. y. Gmelin, \>. 8431. 



Bulla achatina sinistrorsa. Chemnitz, ix. part 1. p. 28. t. 



103. f. 875 and 876. 

 Buccinum, No. 72. Schroeter Einleitung, i. p. 374. 

 Lister Conch, t. 37. f. 36. 



Inhabits 



Shell six inches long, and half as broad ; it differs from B. 

 achatina, not only in haviug the whirls reversed, and the 

 summit less pointed, but the body-whirl has a double trans- 

 verse keel in the middle, which follows the course of the 

 spire at the base of the second whirl, and the inside is bluish 

 white. 



cylindrica. 56. Shell cylindrical, involuted, urn- 

 bilicated at the apex, and striated at the two 

 extremities. 



Bulla cylindrica. Helbings Beytrage, iv. p. 122. t. 2. f. 

 SO and 31. Chemnitz, x. p. 121. t. 146. f. 1356 and 

 1357. Gmelin, p. 3433. 

 Bulla solida. Bruguiere Enc. Meth. p. 374. 

 Favanne, t. 27. f. F 5. Enc. Method, t. 360. f. 2. 



Inhabits the East Indies, and the South Sea. Chemnitz. 



Chemnitz says that the largest specimen in his own collection 

 measured only eleven lines, but those from Spengler's Mu- 

 seum, which he has figured, are seventeen lines long and 

 eight broad. The colour is white, and the shell is smooth 

 in the middle, but striated transversely at the two extremities. 

 The aperture is oblong, extending the whole length of the 

 shell, with the outer lip replicated, and the pillar sinuous. 



cylindracea. 57. Shell cylindrical, involuted, urn- 

 bilicated at the apex, smooth, aperture very 

 narrow. 



Bulla cylindracea. Pennant Brit. Zool. iv. p. 117. t. 70. 

 f. 85. Montagu Test. p. 221. t. 7. f. 2. Maton and 

 Racket, in Lin Trans, viii. p. 127. Dorset Cat. p. 43. 

 1. 18. f. 22. 



Bulla Oliva. Gmelin, p. 3433. 



Bulla cylindrica. Donovan, iv. 1. 120. f. 2. 



Bulla, No. 16. Schroeter Einl. i. p. 192. 



