HO CO^ CHY LI A— DITHYR A. 27. 



Tellina fausta. Montagu, Test. Brit. p. 64. 



Donovan, British Shells, iii. (ab. 98. 



Liinn. Trans, viii. p. 53, tab. 1, fig. 8. 



Tnt'ton, British Fauna, p. 150. 



Dorset Catal. p. 30, tab. 5, fig. 5. 



Wood, Conch, p. 185. 



Turton, Conch. Diet. p. 1 75. 

 Tellina rigida. Donovan, British Shells, iii. tab. 103. 

 Pectunculus depressior. Da Costa, Brit. Conch, p. 194, tab. 13, 



lig. 4, right hand. 

 Pectunculus planus. Lister, Conch, tab. 299, tig. 136. 

 Mus. nost. Western and Irish coasts. 



Shell an inch and a half or two inches long, and something 

 more in breadth, thick and strong, but semitransparent, and 

 fvhen held up to a strong light resembling a newly-laid egg held 

 in the same way, with numerous transverse rounded striae, which 

 grow thicker towards the produced end, and crossed with most 

 minute longitudinal ones, which however are not always visible: 

 one of the valves a little deeper than the other : color yellowish- 

 white, often finely marked with longitudinal scarlet rays: inside 

 glossy, frequently tinged with rosy red ; and under the hinge on 

 the rounded side is a strong oblique rib reaching as far as the 

 anuscular impression : beaks not quite central, with a short im- 

 pression under them. 



We are much inclined io think, that all the above mentioned 

 British species will concentrate into one, whatever denomination 

 may at last be fixed to it. We possess them from an inch to two 

 inches and a half in diameter, Tarying much in their outline : 



