226 



POPULAR CONCHOLOGY. 



Psammobia. 



They are found in all parts of the world ; ten of the 

 species are natives of the British shores. 



Psammobia. Lam. (Grari Schum.) — Shell transverse, 

 oval, equivalve, rather 

 ine unilateral, and slightly 

 gaping at each end ; sur- 

 face smooth or striated ; 

 hinge ha vino; two teeth 

 in one valve, and one in 

 the other : ligament pro- 

 minent ; epidermis thin. 

 Animal, oblong and compressed ; mantle open throughout 

 its length, and bordered by a fringe of fine simple filaments ; 

 the siphons are very long, slender, and delicate, marked 

 with longitudinal ciliated lines, which terminate in more 

 or less conspicuous cirrhi, few in number, surrounding their 

 orifices ; foot rather large and linguiform ; the labial ten- 

 tacles are triangular and internally pectinated ; one of the 

 branchial leaflets on each side is shorter than the other. * — 

 24 species ; also fossil. 



This genus presents a good deal of beauty in some of its 

 species, the shells being often ornamented with lively 

 colours. The animals live in sand or gravelly mud, and are 

 found in the Indian Ocean, the shores of New Holland, 

 the North Sea, and four or five very pretty species are 

 found on the British shores as P. costulata, tellinella, vesper- 

 tina, and ferroensis. They differ chiefly from Tellina in 

 having their ends more gaping. 



Sanguinolabia. Lam. — Shell 

 transverse, equivalve, inequilateral, 

 slightly gaping at both ends; hinge 

 having in each valve two teeth ap- 

 proaching each other, no lateral teeth ; 



Sanguinolaria rosea. 



* Forbes's British Moll. 



