CONCHYLIX—DITHYRA. 26. »I 



one of the teeth is cloven, with one of the segments pointing 

 towards and nearly in a line with the cartilage ; and between the 

 teeth in each valve is a short white longitudinal rib. 



PsAMMOBiA testa oblongd leevi, latere antico ab umbone deeUvo, «licH»i«. 



dente altera concavo. 

 Shell oblong smooth, sloping from the beak on the anterior side, 



with one of the teeth concave. 

 Solen diclivis. Turton, Conch. Diet. p. 164, fig. 80. 



Chama angustior. Lister^ Conch, tab. 421, fig. 265. 

 Mus. nost^ From Scilly, 



Shell three quarters of an inch long, and two inches broad, 

 thin, white or covered with a dark brown skin, irregularly striate 

 transversely, rounded and nearly equal at both ends, sloping 

 from the hinge on the anterior side, and very slightly contracted 

 in the middle: bealis nearly central, small, pointed: in each 

 valve two teeth, one of them concave,, and in one valve orief^ of 

 them oblique. 



PsAMMOBiiA testd oblongd reniformi, sirus transtersis ad Ititera antiquata. 



sublamellatis, dentibus erectis. 

 Shell oblong kidney-form, with transverse striae which become a 



little laminar at the sides, and all the teeth erect. 

 Solea antiquatus. Pennant, iv. p. 174, tab. 49, fig. 4. 

 Montagu, Test. Brit. p. 52. 

 Liinn, Trans^ viii. p. 46^ 

 Donovan, British Shells, iV, tab. 114. 

 Turton^ British Fauna> p. 148. 

 H 2 



