BULLA. 493 



Shell from fourteen to twenty-two lines long, and from six to 

 eight broad ; is very nearly allied to B. strigata, but is wholly 

 white, and has not a vestige of any bands or other markings. 



exarata. 49. Shell oblong, acuminated, white, 

 grooved ; sutures crenulated, and the body- 

 whirl transversely keeled below. 



Bulla exarata. Gmelin, p. 3431. 



Buccinum exaratum. Muller Verm. ii. p. 148. Schroeter 

 Flussconch. p. 390. Chemnitz, ix. part 2. t. 120. f. 1031, 

 1032. 

 Bulimus exaratus. Bruguiere Enc. Meth. p. 36 1. 



Inhabits Guinea, and is a fresh-water species. Chemnitz. 



Shell two inches long, and rather more than half as broad, 

 brittle, pellucid, grooved (or rather wrinkled) longitudinally, 

 white, without any coloured markings. Whirls six or seven, 

 crenulated at the sutures, and the upper ones smooth ; outer 

 lip acute, slightly reflected ; pillar straight, imperforate. 

 Chemnitz's shell has an unpolished, unfinished appearance, 

 and only the body-whirl is keeled. 



truncata. 50. Shell oblong, turrited, white, stri- 

 ated longitudinally ; sutures crenulated ; pil- 

 lar truncated and inflected. 



Bulla truncata. Gmelin, p. 3434. 



Buccinum striatum. Muller Vermium, ii. p. 149. Chem- 

 nitz, ix. part 2. p. 36. t. 120. f. 1028 to 1030. 



Bulimus striatus. Bruguiere Enc. Meth. p. 366. 



Helix tenera. Gmelin, p. 3653. 



Seba, iii. t. 71. f. 6. Kcemmerer Cab. Rud. p. 128. t. 10 

 f. 5. 



Inhabits 



Shell two or three inches long, and not much more than one 



third as broad ; white, longitudinally striated, and has the 



same unpolished and unfinished appearance as B. exarata t 



to which it is nearly allied, but may at once be distinguished 



by its far more slender form. 



priamus. 51. Shell ovate, ventricose, with trans- 

 verse rows of distinct spots ; pillar sinuated, 

 outer lip acute. 



Bulla Stercus-pulicum. Gmelin, p. 3434. 

 Buccinum Stercus-pulicum. Chemnitz, ix. part 2. p. 35. 

 t. 120. f. 1026 and 1027. 



