TURBO. TURBAN. 221 



The sharp margin of the lip, the strong rib behind it, and 

 the position of the tooth distinguish it specifically. We 

 have obtained it in great abundance, on the sand banks at 

 Portmarnock in Ireland, and among the rejectments of ri- 

 vers in England, v. v. 



71. Turbo sexdentatus. Six-toothed Turban. 

 Montagu, pi. 12. f. 8 Dorset Cat. pi. 19. f. 12.* 

 Shell oval, horn-color, semitransparent, obtuse : spires 



five, a little rounded, faintly striate longitudinally : aperture 

 somewhat triangular and distorted, projecting and rounded 

 at the upper and outer angle, slightly margined and re- 

 flected, with a small rib behind it as in T. Chrysalis ; the 

 outer-lip rather angular, with four obscure teeth ; pillar-lip 

 with two teeth, and a slight perforation behind it : length 

 the tenth of an inch; breadth half its length. 



Without a close examination of the aperture, this spe- 

 cies may be easily overlooked for the young of T. Musco- 

 rum. The teeth are so obscure as hardly to be manifest 

 without considerable magnifying powers, and the younger 

 shells have only four. 



On the water-flag : rare. v. v. 



72. Turbo Carychium. Minute Turban. 



Montagu, pi. 22. f. 2 Dorset Cat. pi. 19. f. 13 Walker, 



f. Or. 



Shell oblong-oval, glossy-white, transparent, obtuse : 

 spires five, rounded and well denned, finely striate obliquely : 

 aperture oblong-oval, oblique, compressed, and margined ; 

 the outer-lip thickened on the inside by a protuberance 

 in the middle ; pillar-lip a little angular and reflected, with 

 two teeth, and sometimes the rudiment of a third above 

 them, without perforation behind it ; length hardly the 

 tenth of a line ; breadth nearly half its length. 



Wet banks : under decaying wood ; and in drifted sand. 



73. Turbo insculptus. Sculptured Turban. 

 Montagu, Supplement, p. 129. 



Shell taper, white, semitransparent, obtuse : spires five 



or .six, a little raised, with fine regular circular stride : 



u 3 aperture 



