208 TURBO. TURBAN. 



by a rib, without perforation behind the pillar : length an 

 hjch and a half ; breadth half an inch. 



On most sandy coasts, v. v. 



36. Turbo Turtonis. Turtons Turban. Fig. 97. 



Shell tapering to a fine point, rather opake, pale choco- 

 late-brown : spires from twelve to sixteen, a little rounded, 

 but not deeply separated like the last, and barred the whole 

 length with eleven or twelve ribs, which are flat and very 

 little raised above the surface, and do not as in the last tra- 

 verse the divisions of the volutions, but generally terminate 

 at the line of separation ; some of them are usually much 

 stronger and broader, and irregularly striate longitudinally ; 

 the spaces between the bars very finely but distinctly stri- 

 ate transversely ; on the body volution are three faint brown 

 transverse bands, and two on each of the rest : aperture 

 roundish-oval, margined ; the inner-lip a little spread, with- 

 out perforation, whitish and polished : length often two 

 inches and a half 5 and three-quarters of an inch broad. 



We had considered this shell as a mere brown variety of 

 the last, till its specific differences were pointed out to us 

 by Miss Turton, whose name we have attached to it : and 

 frequent comparison and examination with our concholo- 

 gical friends, have induced us to consider it as distinct. It 

 is never found mixed with theT. Clatlirus : the colors are 

 uniform ; and no intermediate shades have been detected. 

 It is of a larger size, stronger and more opake, and much 

 more elongated and taper : the volutions, though well 

 defined, are never deeply divided, and the ribs always flat- 

 tened, not rising into thin plates, some of them broader and 

 irregularly striate longitudinally : but above all, the spaces 

 between the ribs are obscurely but distinctly marked with 

 numerous close-set transverse striae, a character not in the 

 faintest degree observable in T. Clathrus. 



In many parts of Ireland, but especially about Bajbriggan, 

 they are found crawling among the rocks. We have also ob- 

 served imperfect specimens on the coast of Devonshire, v. v. 



37. Turbo Clathratulus. Small Wentletrap. 

 Lister, pi. 588. f. 51, lower fig. Linn. Trans, viii. pi. 5. 

 f. 1 Walker,*. 45. 



Shell sjender, thin, transparent, glossy-white : spires 



eighi 



