216 MANUAL OF THE MOLLUSCA. 
has observed that B. limbosum, ¢ has the teeth seven cusped, 
while in the females they are six cusped. 
Distribution, 108 species. West Indies, Mediterranean, West 
Africa, India, Australia, South Pacific, Western America. 
Fossil, 30 species, U. chalk—. France. 
TURBINELLA, Lam. 
Etymology, diminutive of turbo, a top. 
Tope, VT. pyrum.. Pl, Vi,-Fie. 2. 
Shell thick; spire short; columella with several transverse 
folds. Operculum claw-shaped. Fig. 70. The chank-shell 
(7. pyrum) is carved by the Cingalese, and reversed varieties of 
it, from which the priests administer medicine, are held sacred. 
Distribution, 70 species. West Indies, South America, Africa, 
Ceylon, Philippines, Pacific, Western America. 
Fossil, 20 species. Miocene—. 
Sub-genera, Cynodonta (Schum.), T. cornigera. Pl. V., Fig. 8. 
Latirus (Montfort), T. gilbula. Pl. V., Fig. 4. 
_ Lagena (Schum.), T. Smaragdula, L. species. Northern 
Australia. 
CANCELLARIA, Lam. 
Etymology, cancellatus, cross-barred. 
Type, OC. reticulata. Pl. V., Fig. 5. 
Shell cancellated ; aperture chanelled in front; columella with 
several strong oblique folds; no operculum. The animals are 
vegetable feeders. (Desh.)* 
Distribution, 71 species. "West Indies, Mediterranean, West 
Africa, India, China, California. 
Fossil, 60 species. Up. Chalk—. Britain, France, &c. 
Admete (vyiridula) is a boreal form of Cancellaria, without 
plaits. 
DIBAPHUS, Phi. 
Synonym, conohelix edentulus. (Sw.) Shell subcylindrical, 
spire acute; aperture narrow, linear, edentulous, excised at the 
base; lip thickened, rectilinear, rounded and abbreviated below. 
TRICHOTROPIS, Broderip, 1829. 
Etymology, Thrix (trichos), hair, and tropis, keel. 
Type, T. borealis, Pl. VI., Fig. 8. (=? Admete, Phil., no 
operculum). 
* Cancellaria and trichotroms form a sme} natnralfamily connected with ceritriada 
and strombide. 
