VENERUPIS PERFORANS. PSAMMOBIA. 49 



*' These genera consist mostly of small shells, 

 inhabiting stones, into which they bore holes. S. 

 rugosa is British. Vetiertqns lyerforans is found 

 on our coasts in stones. The valves of these 

 shells have no accessory pieces like Pholas. 



" Nymphacea is the next family, containing, 

 in the first section, 



Sanguinolarla Soleii . 



Psammohia Tellina. 



Psammotcea 



'^ In the genus Psammohia we find our Tel- 

 Una Feroensls. (Plate 4.) The shells of this 

 and the preceding genus resemble the solens in 

 a trifling degree, being a little open at the sides. 

 In form they are near Tellina, but have not the 

 fold on the anterior valve, but an angle on each 

 valve. The ligament is exterior. 



" In the second section are — 



Tellina Tellina. 



Tellinides Tellina. 



Corhis Venus. 



Lucina Venus and Tellina. 



Donax Donax. 



Capsa Donax. 



Crassina Venus. 



