108 MANUAL OF THE MOLLUSCA. 



Shell fusiform, elongated ; whirls round or angular ; canal open ; co- i 

 lumellar lip tortuous, with, several oblique folds. Operc. claw-shaped. F. i 

 gigantea of the S. Seas, attains a length of nearly two feet. ' 



Distr., 16 sp. W. Indies, Medit., W. Africa, India, Australia, S.Pacific, | 

 W. America. l 



Fossil, 28 sp., U. chalk — . France. ■<' 



TuRBiNELLA, Lam. 



Etym., diminutive of turbo, a top. 



Ti/pe, T. pyrum. PI. V., fig. 2. 



Shell thick ; spire short ; colmnella ^-ith several transverse folds. Oper- 

 culum claw-shaped. Fig. 63. The shank-shell {T. pyrum) is carved by the 

 Cingalese, and reversed varieties of it, fi'om which the priests administer 

 medicine, are held sacred. 



Distr., 70 sp. W. Indies, S. America, Africa, Ceylon, Philippines, 

 Pacific, W. America. 



Fossil, 20 sp. Miocene — . 



Suh-genera. Cynodonta (Schum.) T. cornigera. PI. V., fig. 3. 



Latirus (Montf.) T. gilbula. PI. V., fig. 4. 



Cuma (Humphr.) T. angulifera, inner lip with a single prominent fold 

 operculum like purpura. 



Lagena (Schum.) T. Smaragdula, L. sp. N. Australia. 



Cancellaria, Lam. 



Etym., cancellatus, cross-barred. ^ 



Type, C. reticulata. PI. V., fig. 5. * 



Shell cancellated ; aperture channelled in front : columella with several | 



strong oblique folds ; no operculum. The animals are vegetable feeders. 



(Desh.)* I 



Distr., 70 sp. W. Indies, Medit., W. Africa, India, China, California. \ 

 Fossil, 60 sp. Eocene — . Britain, France, &c. 



I 



i 



Trichotropis, Broderip, 1829. 



Etym., Thrix, (trichos) hair, and tropis, keel. 



Type, T. borealis, PI. VI., fig. 8. (= ? Admete, Phil., no operculiun.) 



Shell thin, umbiJicated ; spirally fiuTowed ; the ridges with epidennal j 

 fringes ; columella obliquely truncated ; operc. lamellar, nucleus external. "' 



Animal -vslth a short broad head ; tentacles distant, with eyes on the ' 

 middle ; proboscis long, retractile. ' 



Lingual dentition similar to stromhus ; teeth single, hamate, denticulated ; \ 

 undni 3 : 1 denticulate 2 and 3 simple. 



* Cancellaria and trichotropis form a small natural family connected with cert- ; 

 ihiadce and strombidce. 



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