426 



operculum present or absent. Cretaceous 



MONOTOCARDIA — TOXOGLOSSA chap, xiv 



Principal 

 genera: Oliva (Figs. 283, and 98, p. 199), 

 Olivancillaria (including Lintricula and 

 Agaronia)^ Olivella^ Aneilla (subg., Aneil- 

 lind), 



{e) ToxoGLOSSA (p. 218). — Radula with 

 normal formula 1-0-1, teeth large ; oesophagus 

 with a large poison gland; animal carnivo- 

 rous, exclusively marine. 



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

 the tentacles, shell subulate, 

 many whorled, operculum 

 with terminal nucleus. 



Eocene . Single genus, 



Terehra^ with several sec- 

 tions. 



Fam. 2. Conidae. — Eyes 

 on outer side of tentacles. 

 Fig. 284.-rere6m sub- siphon prominent ; shell 



ulata L,, Ceylon. ^ c f 



conical or fusiform, aperture 



narrow. Cretaceous . 



Principal genera: Conus, shell solid, spire 

 short, aperture narrow, straight, internal par- 

 titions partly absorbed; Conorhis^ Genotia 

 (with several sections, chiefly Tertiary), ^^^ 285. — Pieuro- 

 JPusiofiella, Columbarium, Qlavatula, Surcula, tomatigrinaLa.m., 

 Pleurotoma ; Borsonia (Eocene), Drillia 

 (subg., Spirotropis), Bela, Mangilia (including 

 BapJinella, Clathurella, and others), Halia. 



Fam. 3. Cancellariidae. — Proboscis short, usually no 

 radula, shell oval, columella strongly plicate ; no operculum. 



Cretaceous . Single genus, Cancellaria (subg., Merica, 



Trig ono stoma, Admete). 



