208 
TURBO. TURBAN . 
by a rib, without perforation behind the pillar: length an 
inch 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 arc 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 bauds, 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; 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. Clathrus : 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 stria?., a character not in the 
faintest degree observable in T. Clathrus. 
In many parts of Ireland, but especially about Balbriggan, 
they are found crawling among the rocks. We have also ob¬ 
served imperfect specimens on the coast of Devonshire, v. v. 
3/. Turbo Clathratulus. Small JFertile trap. 
Lister , pi. 588. f. 51, lower fig.— Linn. Trans, vm. pi. 5. 
f. 1— JFaIker, f. 4 5 . 
Shell slender, thin, transparent, glossy-white: spires 
eight 
