224 



POPULAR CONCHOLOGY. 



freely open in front, with fringed or partially fringed 

 margins; siphons separated to their bases, the branchial 

 with pinnated cirrhi round the orifice, the anal with 

 simple denticulations ; foot very large, apiculated, sharp 

 edged ; branchial laminae on each side distinctly separated : 

 labial palpi long and triangular.* — 40 species ; also 

 fossil. 



The species are found in all parts of the world buried in 

 the sand of the shore ; many of them very beautiful, though 

 few have any striking colours ; they have a horny, light 

 coloured epidermis. Several are natives of our shores. 



Amphichcena. Philippi. — Shell elongated, almost 

 lineal, nearly equilateral, gaping on both sides; bosses small; 

 hinge with two teeth in one valve, and three in the other, 

 no lateral teeth ; ligament external, on scarcely meeting 

 hinge plates ; two muscular impressions, and a deep mantle 

 sinus. Animal unknown. — 1 species. 



The species A. Kindermanni from Mazatlan, appears to 

 be a form between Donax and Solen. 



Gkateloupia. Desmoulins. — Shell equivalve, nearly 

 equilateral, sub-cunei- 

 form, rounded anteriorly ; 

 subrostrated posteriorly ; 

 hinge, with three car- 

 dinal teeth, a series of 

 five or six irregular small 

 diverging teeth behind 

 the umbones, and one 

 lateral anterior tooth in 

 each valve ; ligament ex- 

 ternal ; muscular impres- 



Gra tcloupia JIou linsii. 



* Forbes 1 * British Moll. 



