146 



or reflected, without teeth or folds but furnished with a 

 small oblique gibbosity in the middle. 0,30... 0,1 5. 

 Exmouth. 



A. HETEROCLITA. VOLTJTA H. Laskey. Wern. 

 Mem. 1. p. 398. t. S.f. 1,2. ACTEON H. P.p. 337. 

 Glossy, white, veined like ivory in a longitudinal 

 direction, with eight or nine reversed whorls which taper 

 slightly to an obtuse point, the body whorl occupying 

 two thirds of the length ; aperture narrow not quite half 

 the length of the shell ; pillar with one plait, ...0,085. 

 Dunbar. 



GENUS. TRUNCATELLA. LOWE. 

 Turrited, the adult cylindrical decollated or obtusely 



truncated ; whorls well defined, either smooth or 



with longitudinal ribs ; aperture oval and short ; 



the peritreme contiguous ; lip simple, no epidermis. 



T. MONTAGUI. Lowe, in Z. J. 5. p. 303. TURBO 

 TRUNCATA. Mont.p. 300. t. 10. /. l.Turt. D. no. 

 65. TURRITELLA T. 1^.303. Cylindrical, smooth, 

 glossy, pellucid, thin, horn-colored, with four spires ; 

 the apex abrupt as if broken; whorls much raised, 

 the suture deep ; aperture suborbicular, slightly mar- 

 ginated, reflecting a little on the pillar lip variety 

 (rare) longitudinally striated or marked with cre- 

 nulsc in the sutures. 0,20... 0,07. Young, TURBO 



