TURBO. TURBAN . 
20 7 
by finer longitudinal lines, but hardly distinctly reticulate : 
aperture orbicular, the margin thin and faintly marked by 
the outer strias; pillar-lip reflected, forming a slight per¬ 
foration behind it: length five-eighths of an inch 5 breadth 
three-eighths. 
In woods, and at the roots of fern. Near Sidmouth, in 
Devonshire, they are found imbedded in the chalk cliffs, in 
a kind of fossile state 5 probably having been formerly 
washed down, and gradually buried in the cretaceous soil. 
i.v. 
» 34. Turbo fontinalis. Stream Turban. 
Montagu , pi. 22. f. 4— Donovan , pi. 102— Dorset Cat. 
pi. 18. f. 3, 4— Walker , f. 56. 
Shell slightly conic, rather depressed and obtuse at the 
tip, thin, transparent, horn-color: spires five, much rounded 
and deeply divided, slightly wrinkled or striate longitudi¬ 
nally, with often the appearance of a few faint circular 
ridges on the larger volution : aperture quite circular, at¬ 
tached to the body volution at one point only ; the margin 
very thin, a little reflected at the pillar, behind which is a 
large and deep perforation : length sometimes a quarter of 
an inch, and as much broad. 
In canals, and slow streams, v . v. 
E. The spires cross-bar reel, or reticulate , 35 to 56. 
r 35. Turbo Clathrus. False Wentletrap. 
Lister, pi. 588. f. 51— Pennant, pi. 84. f. 2—Da Costa, 
nl. 7 . f. H_ Donovan, pi. 28— Dorset Cat. pi. 15. f. 11. > 
Shell tapering to a fine point, thin, transparent, white 
\ with sometimes obscure brown transverse markings: spires 
ten or twelve, very much rounded, and so deeply divided 
that they appear connected by the bars only which tra¬ 
verse them j these longitudinal bars are ten or twelve in 
rinmber, running rather obliquely from the base to the tip, 
much raised, sometimes a little rounded, but mostly thin 
and membranaceous, and placed at rather remote but equal 
.distances : the interstices between them quite smooth and 
polished : aperture roundish-oval, thickened at the margin 
