426 



MONOTOCARDIA TOXOGLOSSA 



CHAI'. XIV 



present or absent. Cretaceous- 



Principal genera : Oliva 

 (Figs. 28.3 and 98, p. 200), Olivancillaria (in- 

 cluding TAntricula and Agaronia), Olivella, 

 Ancilla (subg. Ancillina). 



(c) ToxoCxLOSSA (p. 218). — Eadula with nor- 

 mal formula 1"0'1., teeth large ; oesophagus 

 with a large poison gland ; animal carnivorous, 

 exclusively marine. 



Fam. 1. Terchridar.. — Eyes at the end of 

 the tentacles, shell sul)ulate, 

 many whorled, operculum 

 with terminal nucleus. 



Eocene . Single 



genus, Terehra, with several 

 sections. 



Fam. 2. Conidac. — Eyes 

 on outer side of tentacles, 

 siphon prominent; shell coni- 

 cal or fusiform, aperture nar- 

 row. Cretaceous . 



Principal genera : Conns, shell solid, spire 



short, aperture narrow, straight, internal par- 

 titions partly absorbed ; Co7iorhis, GenofAa 



(with several sections, chiefly Tertiary), Pus- 



ionella, Columharium, Clavatida, Surcula, Fleu- 



rotoma ; Borsonia (Eocene), Drillia (sub: 



Mangilia (including Daphnella, Clathurella, and others), Halia. 

 Fam. 3. Ganccllariidae. — Proboscis short, usually no radula, sliell 



oval, columella strongly plicate ; no operculum. Cretaceous . 



Single genus, Cancellaria (subg. Merica, Trigonostoma, Admete). 



Fig. 284. — Terehrasub- 

 ulata L., Ceylon. 



Fig. 285. — Pleurotuma 

 tigrina Lam., E. 

 Indies. 



S2nrotro2ns), Bela, 



