68 



X. AZECA. 



Shell subcylindrical, rather obtuse : aperture pear- 

 shaped, curved and pointed at the top ; the mar- 

 gin thick, obtuse, and united all round : umbilicus 

 none : operculum none. 



In shape, colour, polish and habitat, this shell so 

 exactly resembles the Bul'imus lubricus, that some 

 have questioned if this latter shell be not the same 

 in its earlier stage of formation before the teeth 

 appear : but the singular shape of the aperture 

 decidedly removes it into a distinct genus, whicli 

 is adopted from Dr. Leach. 



52. AzECA Matoni. Leach, Mollusc, jo. 122. t. 8./. 8. 

 Turbo tridens. Montagu, p. 338. t.ll.f. 2. 

 Laskey, Wern. Soc. i. p. 406. t. 8. 



f.n. 



a. with three teeth, one above and one on each 

 side. 



b. with two additional denticles, alternating 

 with the larger one. 



Shell two tenths of an inch long, and a third part 



