228 TURBO. TURBAN. 
89. Turbo paludo.sus. White Turban. 
Helix paludosa. Linn. Trans, via. pi. 5. f. 5— Dorset Cat. 
pi. 19. f.25— Walker, f. 23. 
. Shell white or very pale horn-color, semitransparent, 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. 
80. Turbo depressus. 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 tounded and well defined ; the base cunvex, 
with a large perforation exposing the interior volutions: 
aperture orbicular, not clasping the body, hut 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 Tcigmnouth, at low water. To obtain them 
alive wc are obliged to detach small fragments of the rock, 
and examine the pieces with a good glass. They somethin^ 
resemble the Helix umbilicata, but the upper volutions are 
not so prominent 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 a fine bronze color. 
v. v. 
91. Turbo Serpuloides. Flat Turban. 
Helix Serpuloides. Montagu, p\.2\. f. 3. Walker,i. 2J> 
Shell flat, white, glossy, smooth : spires three or fou’r, 
nearly flat and level on both sides ; the upper surface being 
.very sligntly raised; the under side with a large and deep 
peiioration exposing- the interior volutions : aperture orbi- 
' ■ njlar. 
