228 TUliBO. TURBAN. 



89. Turbo paludosus. White Turban. 



Helix paludosa. Linn. Trans, viii. pi. 5. f. 5 Dorset Cat 

 pi. 19. L2b Walker, f. 23. 



Shell white or very pale horn-color, semitrans parent, a 

 little convex on the upper side, with a large and deep per- 

 foration on the other : spires four, rounded and well de- 

 fined, obscurely striate across : aperture quite circular, very 

 slightly attached to the body volution, with a thick opake 

 white reflected margin : diameter the tenth of' an inch. 



Variety. The spires striate or annulate with membrana- 

 ceous ridges. 



Helix Crenella. Montagu, pi. 13. f. 3. 

 Marshes, and drifted sand. v. v. 



90. Turbo depress us. Depressed Turban. 

 Helix depressa. Montagu, pi. 13. f. 5. 



Shell flattish, very thin, transparent, pale horn-color, 

 olackish where any part of the animal is attached, slightly 

 wrinkled across : spires three or four, a little raised on the 

 upper side and rounded and well denned ; the base convex, 

 with a large perforation exposing the interior volutions ; 

 aperture orbicular, not clasping the body, but placed a little 

 obliquely and slightly spreading at that part ; the margin 

 prominent and very thin : diameter not half a line. 



This very minute species we find in the crevices of the 

 rocks about Teignmouth, at low water. To obtain them 

 alive we are obliged to detach small fragments of the rock, 

 and examine the pieces with a good glass. They something 

 resemble the Helix umbilicata, but the upoer volutions are 

 not *o prom nent and well defined, and they are hardly a 

 fourth-part the size, presenting on a card a mere dark speck. 

 In Bantry bay we have found them of u hue bronze color* 

 v. v. 



91. Turbo Serpuloides. Flat Turban. 



. Helix Serpuloides. Montagu,pl.2l. f. 3. JPalker,f.27? 



Shell flat, white, glossy, smooth : spires three or tour, 

 nearly flat and level oa Loth sides ; the upper surface being 

 very slightly raised ; the under side with a large and deep 

 perforation exposing the interior volutbws : aperture orbi- 

 cular. 



