CONCHYLIA— D/THri?^. 26. 85 



23. TSAMMOBIA— LAMARCK. 



Testa transversa, ohlonga vel uvata, oequivalvis, lateribus subhiantibus. 



Cardo dentibus subbinis : later alibus nullis. Ligamentum externum. 

 Shell transverse, oblong or oval, equivalve, mostly open at the sides. 



Hinge with two teeth in one or both the valves : lateral teeth 



none. Ligament external. 



This genus comprehends such species of the Linuean Tellina as 

 have no lateral teeth, and of the Solen as have not a linear form 

 with the hinge close to one end. 



From other genera which resemble it in the structure or number 

 of the teeth, it differs in gaping more or less at the sides. 



* Valvd altera bidentatd. 1-5. 

 ^Vith two teeth in one of the valves only. 



PsAiMMOBiA testa ovato-oblongd lavi, costd longitudinali internd, dente 



altera apice complanato. i- 



Shell oval-oblong smooth, with a longitudinal rib on the inside, and 

 one of the teeth flattened at the top. 



Tab nost. 8,_%. 3. 

 Solen fragilis. Montagu, Test. Brit. p. 51, Suppl. p. 26. 



Pennant, Brit. Zool. iv. p. 174 

 Dorset Catal. p. 28, tab. 4. fig. 5. 

 Wood, Conch, p. 126, tab. 29, fig. 4, 5. 

 Dillwyn, Descrijjt. Catal. p. 65. 



