TURBO. TURBAN. 
193 
spiral perforation: length three-eighths of an inch; breadth 
a quarter. ^ 
Variety. Strongly striate transversely. Fig. 24, 25. 
On the leaves of Fuci. v. v. 
2. Turbo Puteolus. Cavcrned Turban. Fig. .90, 91. 
Shell oblong-oval, thin, semitransparent, striate or wrin¬ 
kled transversely, whitish covered with a dark purple skin: 
spires three or four, the first very large and produced in 
front, the others placed laterally, but raised rounded and 
well defined: aperture large, roundish-oval, rounded and 
not spread at the front margin ; the outer-lip thin ; pillar- 
Bp with a broad deep groove, ending in a very large deep 
and sc me what spiral perforation: length nearly half an inch 5 
Breadth a quarter. 
Variety. With three or four pale hands on the body vo¬ 
lution which continue round the smaller ones in a single 
band. 
This very distinct species, which we have taken both in 
Dublin bay and on the rocks between Teignmouth and 
Dawlish, may be easily discriminated from T. pal lid id us. 
By its elongated shape and prominent spire, and very large 
groove and perforation. When placed on a table, with the 
outer margin in front, the T. pallidulus has a somewhat 
triangulur appearance, in consequence of the lateral volu¬ 
tions being concealed from the view, and the dilatation of 
the front margin. The T. Puteolus in the same position 
has a well rounded and rather oblique outline, with tne la¬ 
teral volutions very visible, and projecting : the front mar¬ 
gin is also well rounded and not dilated. The T. Lacuna 
has a nearly globular appearance, with the lateral voiutio.ns 
rather prominent. 
We have found it both in Dublin bay, and on tne rocks 
Between Teignmouth andDawlish,in Devonshire, attached 
to Fuci. t*. v. 
3. Turbo Lacuna. Excavated Turban. Fig. S7, 83, 89. 
Helix Lacuna. Montagu, pi. 13. f. 5. i 
Merit a vufa. Da Costa, pi. 8 . f. 12 —Dorset Cat. pi. 1 4. f 1—• 
Shell nearly globular, thin, semitransparent, smooth but 
lotjdosw, covered with a thin skin : spires lour, the first 
s very 
