120 CO^CHYLW—DJTHYRA. 29. 



Shell orbicular and nearly equilateral, with arched striae which 



form right angles at both the sides. 

 Tellina divaricata. Linn. Syst. Nat. p. 1120. 



Gmelin, Syst. p. 3241. 



Titrton, Linn. Syst. iv. p. 196. 



Chemnitz, vi. p. 134, tab. 13, fig. 129. 



Wood, Conch, p. 195, tab. 46, fig. 6. 



Dillwtjn, Descript. Catal. p. 102. 



Turton, Conch. Diet. p. 178. 

 Cardium arcuatum. Montagu, p. 85, tab. 3, fig. 2. 



Pennant, Brit. Zool. iv. p. 190. 



Linn. Trans, viii. p. 67. 



Turton, British Fauna, p. 153. 

 Pectunculus parvus. Lister, Conch, tab. 301, fig. 142. 

 Mus. nost. South of Devon, Teignmouth beach. 



Shell half an inch in diameter, white, thin, brittle, orbicular 

 with a slight flexuosity on the hinder side, rather convex, with 

 regular but not very close striae which form rather oblique curved 

 lines and turn off" at both the sides nearly in right angles : beaks 

 central, very prominent: hinge with a single cloven tooth in one 

 valve, closing between two plain ones in the other ; the lateral 

 teeth remote and small. 



The few specimens which we collected on the shores at Teign- 

 mouth, answer exactly to the above character and description, 

 and differ materially from the Tellina digitaria of Linne. 



This latter shell has very fine and uniform obliquely 

 arched striae, like the lines at the ends of the fingers, with a 

 slight angular curvature on one side only ; the lateral teeth are 



