118 



MANUAL OF THE MOLLUSCA. 



PLEUROTOMA, Lam. 



Etym., pleura, the side, and toma, a notch. Syn., turns, Humph. 



Types, P. Babylonica, PL VII., fig. 3. P. miteformis, &c. 



Shell fusiform, spire elevated ; canal long and straight ; outer lip with a 

 deep slit near the suture. Operculum pointed, nucleus apical. 



Distr., 430 sp. World-wide. Greenland, Brit., 17 ; Medit., 19 ; Africa, 

 15; Red Sea and India, 6 ; China, 90; Australia, 15; Pacific, 0? W. 

 America, 52 ; W. Indies and Brazil, 20. The typical sp. about 20 (China, 

 16 ; W. America, 4.) Low water to 100 fathoms. 



Fossil, 300 sp. Chalk. Brit., France, &c. Chile. 



Sub-genera. Drillia, Gray. D. umbilicata, canal short. 



Clavatula, Lam., canal short, operc. pointed, nucleus in the middle of the 

 inner edge. C. mitra, PL VII., fig. 4. 



Tomella, Sw., canal long ; inner lip callous near suture. T. lineata. 



? Clionella, Gray. C. sinuata, Born sp. (= P. buccinoides) freshwaters, 

 Africa. 



Mangelia, Leach, (not Reeve). Apertural slit at the suture ; no operc., 

 M. tamiata, PL VII., fig. 5. Greenland, Brit., Medit. 



Bela, Leach. Operc. nucleus apical. B. turricula, PL VII., fig. 6. 



Defrancia, Millet,* no operc. D. linearis, PI. VII., fig. 7. 



? Lachesis, Risso, L. minima, PL VII., fig. 8, apex mammillated ; operc. 

 claw-shaped. Medit., S. Brit. In shallow water. 



Daphnella, Hinds. D. marmorata. New Guinea. (Buc. junceum. L. clay). 



FAMILY V. VOLUTION. 



Shell turreted, or convolute ; aperture notched in front ; columella 

 liquely plaited. No operculum. 



Fig. 73. t 

 Animal with a recurved siphon ; foot very large partly hiding the \ 



* According to Mr. S. Hanley, Defrancia is synonymous with Mangelia. 

 t Fig. 73. V. undulata, Lam. Australia (from Quoy and Gaiinard), 



