82 CONCHYLIA — D/r/^F«^. 25. 



Shell straight^ in one valve a single compressed obtuse slightly 

 cloven tooth, and two in the other. 



Tab. nost. 6, fig. 6. 

 Mus. nost. From the sands in Torbay. 



Shell resembling the Solen Siliqua in every respect, except in 

 the teeth, which preserve a constant character. In the species 

 under consideration, the single tooth is compressed, rounded and 

 obtuse at the top where it is slightly cloven. 



In the Solen Siliqua the tooth is depressed or flattened in a 

 contrary direction, with a strong rib in the middle ending in an 

 extremely sharp acicular point, answering to its description by 

 Linne in the Mus Lud. Ulr. p. 473, " Cardo dente unico sub- 

 nlato in allerd testa.'' Hinge with a single subulate tooth in 

 one of the valves. 



On the sands at Tor Abbey, at low water mark, this species may 

 be dug up in great abundance, mixed with the Solen Siliqua and 

 S. Vagina, and is probably equally common on all sandy shores : 

 but the differences may not have been remarked, as cabinet spe- 

 cimens in general are dead shells, with the teeth shed or much 

 defaced. 



;>. 



Ensis. Solen testa subarcuatd, valvd alterd unidentatd, alterd biden- 

 tatd dentibus simplicihus. 

 Shell somewhat curved, with a single tooth in one valve and two 



in the other, all undivided. 

 Solen Ensis. Ltim. Syst. Nat. p. 1 114, 



Gmelin, Syst. p. 3224. 

 Turton, Linn. Syst. iv. p. 180. 

 rennant, Brit. Zool. p. 172, tab. 48, %. 2. 



