GASTROPODA 561 



H. ventricosa Lam. (Fig. 884). Length 12 cm.; color brownish, 

 with square spots of purple forming broad spiral bands on the whorls; 

 between the ribs are scallops of light and dark 

 brown: Indian Ocean; often used as an ornament. ^i^^^ 



Division 5. TOXOGLOSSA. /SP^^i^^ >\ 



Radula long and narrow, with 2 rows of long I^^SSV'-5')*'^| 



teeth, which are the marginals, the centrals and lat- P-^;^55 "i^- '.V^/ 



erals being absent ; proboscis with a poison gland ; VX\-i^ ^-^ / 



siphon distinct ; aperture either notched below or pro- V ^S^v >■• v/ 

 longed to form a siphonal canal; shell spiral: 4 fami- V'^^>"i^ 



lies, all marine, and mostly carnivorous, the animals ^-<i''-7 



feeding largely on moUusks which they kill by means Fig. 884 



of their long teeth and the poison. (Rogers). 



Key to the families of Toxoglossa: 



Ci Shell a reversed cone 2. Conidae 



flj Shell not a reversed cone. 

 6i Shell with a tall spire. 



Ci Aperture ending below with a notch 1. Terebridae 



C2 Aperture channelled below notched above 3. Pleurotomidae 



62 Shell more or less ovate 4. Cancellariidae 



Family 1. TEKEBEIDAE. 



Shell elongate, w^ith a very tall acute spire and with flattened 

 whorls; aperture small, with a deep notch below; operculum horny; 

 tentacles short, wide apart, with eyes at their tips or wanting: 1 genus. 



Terebra Lamarck. With the characters of the family : 200 species, 

 mostly tropical. 



T. dislocata Say. Shell 44 mm. long, 8 mm. wide; color brownish 

 or yellowish, with a pale revolving band and numerous minute revolving 

 lines; whorls 13, with 15 to 18 ribs on each and numerous minute revolv- 

 ing grooves: Maryland to Texas and in the West Indies; in shallow 

 water. 



Iamily 2. CONIDAE. 



Shell thick, conical, with a low, flattened spire and a very large 

 lower whorl which tapers towards the lower end; surface often smooth 

 and brightly colored; aperture long and narrow; operculum present or 

 absent ; proboscis long ; siphon short and thick : numerous species, mostly 

 tropical, many very beautiful. 



CoNUS L. With the characters of the family: 300 species. 



C. calif ornicus Hinds. Spire without protuberances; color of shell 

 white, of periostracum chestnut; latter sometimes hirsute; length 25 

 mm.: California, towards the south. 



