108 MANUAL OF THE MOILTJSCA. 



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

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

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



Bistr., 16 sp. AV. Indies, Medit., W. Africa, India, Australia, S. Pacific, 

 W. America. 



Fossil, 28 sp., U. chalk — . France, 



TuKBiNELLA, Lam. 



Btym., diminutive of turho, a top. 



Type, T. pynmi. PI. V., fig. 2. 



Shell thick ; spire short ; columella \\ath several transverse folds. Oper- 

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

 Cingalese, and reversed varieties of it, from which the priests administer 

 medicine, are held sacred. 



Bistr., 70 sp. W. Indies, S. Amei'ica, 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. Smaragdida, L. sp. N. Australia. 



Cancellaria, Lam. 



Etym., cancellatus, cross-barred. 



Type, C. reticulata. PL V., fig. 5. 



Shell cancellated ; aperture channelled in front : columella with several 

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

 (Desh.)* 



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



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



Trichotropis, Broderip, 1829. 



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



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



Shell thin, umbilicated ; spirally fiuTOwed ; the ridges with epidermal 

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



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

 middle ; proboscis long, retractile. 



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

 tmcini 3 : 1 denticulate 2 and 3 simple. 



* Cancellaria and trichotropis form a small natural family connected with ceri' 

 ihiadce and strombidce. 



