90. CONCHYLIA—DITHYRA. 26. 



»^# Valvis bidentatis. 6-14. 

 With two teeth in each valve* 



i^egiimea. Psamivlobia UstA linear i'obhngd leevi, dente altera bipartite 

 segmentis divarivatis. 

 Shell narrow-oblong smooth, one of the teeth deeply cloven w4tk 



the segments divaricate. 

 Soleii Legumen. Linn. Syst. Nat. p. 1114'. 

 Gmelin, Syst. p. 3224. 

 Turton, Linn. Syst. iv. p. 18*1 . 

 Pennant, iv. p. 173, tab. 49, fig. 3. 

 JDa Costa, Brit. Conch, p. 238. 

 Montagu, Test. Brit, p. dOi 

 Chemnitz, vi. p. 49, tab. 5, fig. 32-34. 

 Donovan, British Shells, ii. tab. 53. 

 JLinn. Trans, viii. p. 45-. 

 Tw'ton, British Fauna, p. 148. 

 Dorset Catal. p. 29, tab. 4, fig. 4. 

 Woodi Conch, p. 124], tab. 28, fig. 4^ *. 

 Dillwyn, Descript* Catal. p. 60j 

 Turton, Conch. Diet. p. 162. 

 Cbama, fusca. Lister, Conch, tab. 420, fig. 264. 



AUts. nosi* North of Devon, Swansea, Ireland^ <&& 



Shell three quarters of an incJi ]ongi and nearly four- incbe*' 

 broad, a. little tapering and sloping at one end,' rounded at both, 

 white or, covered. with a greenish-yellow skin, smooth cwr T^&ry«- 

 faintly striate transversely .: hinge marly central; iivoueralre 



