4 1 4 MONOTOCARDI A — TAENIOGLOSSA 



309), last whorl disconnected, often reflected back upon the 

 spire, (iii-) Pupininae, shell more or less lustrous, bluntly- 

 conical, lip with a channel above or below. Genera : Pupina 

 (subg., Registoma^ Callia^ Streptaulus, Pupinella, Anaulus)^ Hyho- 

 cystis (Fig. 205, p. 305), Oataulus, Coptochilus, Megalomastoma, 

 (iv.) Cyclophorinae^ shell turbinate or depressed, operculum corne- ' 

 ous or calcareous. Genera : Alycaeus, Craspedopoma, Leptopoma^ 

 LagocMlus^ CyclopJiorus (Fig. 206, p. 306 ; including Piadema^ 

 Aulopoma^ Pitropis, and others), Aperostoma (including Cyrto- 

 toma and others), Cyathopoma^ Pterocyclus (subg., Myxostoma^ 

 Spiraculum^ Opisthoporus, and Rhiostoma (Fig. 180, p. 266), 

 Oyclotus, Cyclosurus^ and Strophostoma. 



Fam. 13. Oydostomatidae. — Ctenidium replaced by a pul- 

 monary sac, tentacles obtuse, foot with a deep longitudinal me- 

 dian groove ; central tooth, lateral, and first marginal more or less 

 bluntly cusped, second marginal large, edge pectinate; shell 

 variously spiral, spire usually elevated, 

 aperture not quite circular ; operculum 

 generally with an external calcare- 

 ous and an internal cartilaginoid lam- 

 ina, rarely corneous. Terrestrial only. 



Cretaceous . Genera : Cyclostoma I 



(subg., Leonia^Tropidophora^ Rochebrunia, 



Fig, 274:. — Cyclostoma cam- Georgia^ Otopoma^ Lithidion, Revoilia)^ 



IZclT"^ Pfr., Mada- Cyclotopsis, Ohoanopoma (subg., Licina, 



Jamaieia, Ctenopoma, Plplopoma^ Adam- 



siella)^ Oistula (subg., Chondropoma^ Tadora)^ Omphalotropis 



(subg., Realia, Cydomorpha'), Hainesia^ Acroptychia. 



Fam. 14. AcieuUdae. — Ctenidium replaced by a pulmonary 

 sac, tentacles cylindrical, pointed at the end, eyes behind their 

 base, foot long and narrow ; central tooth and lateral ver}^ similar, 

 pinched in at the sides, external marginal broad, edge finely pec- 

 tinate ; shell small, acuminate, with a blunt spire, operculum 



corneous. Terrestrial only. Tertiary . Genus, Acicida 



(^ = Acme), 



Fam. 15, Truncatellidae. — Ctenidium replaced by a pul- 

 monary sac, proboscis very long, eyes sessile, behind the base of 

 the tentacles, shell small, evenly cylindrical, apex truncated in 



the adult. Eocene . Genera : Truncatella (subg., Taheitia^ 



Planfordia^ and Tomichia)^ Creomelama (subg., Chittya and 

 Blandiella)^ Cedna (?). 



and • I 



i 



