154 



three, smooth, longitudinally oblong ; aperture oblong, 

 body lip a little thickened and flattish. 0,08. Inter- 

 stices of rocks covered at high water, Devonshire. 



TRIRE. MACROSTOM^:. 



Auriform, with the aperture very wide and the mar- 

 gins disunited ; without an operculum or columella. 



GENUS. SIGARETUS. 

 Subauriform, suborbicular ; inner Up short and spirally 



intorted ; aperture entire, dilated, rounded oblong, 



not nacreous ; margins disunited. 



S. PERSPICUA. HELIX P. Lin. not Gmel. 

 S. HALIOTOIDEUS. F. p. 360. BULLA H. Mont. p. 

 211. t. 7./. ^.(Animal vignette. 2.f. 6.)Lin.T.S. 

 p. 123. Dor. Cat. p. 43. t. 22. / 5.* HELIX H, 

 var.? D. p. 973. S. CONVEXUS. Blainv. t. 42. 

 /. 2. Suboval, ear-shaped, extremely thin, white, 

 pellucid, glossy, smooth but not quite destitute of 

 wrinkles; aperture oval, not quite extending to the 

 apex which is small, obtuse, and laterally convoluted, 

 scarcely making two volutions ; the body of the shell 

 very small and only turning a little inwards spirally ; 

 inner lip visible to the end. i...i: Devon, rare. 



S. TENTACULATUS, F. p. 360, LAMELLARIA. T, 



