44 POPULAR BRITISH CONCHOLOGY. 



texture^, but in less degree, ornaments the surface. 

 The siphonal tubes of the animal are rather longer ; 

 they are straight and ciliated; the foot as in Pandora. 

 The British species is L. Norvegica. 



ANATINIDJB. 



The shell of the genus from which this family takes its 

 name is one of the most beautiful of bivalves. The Anatma^ 

 in form Hke Lyonsia, but much more gracefully curved, 

 more inflated and equivalve, is exquisitely delicate and trans- 

 parent, as well as beautifully pearly : the same cannot be 

 said of the only two genera which will come under our 

 notice in this work as containing British species. 

 I. Thracia. — We still have to repeat the oval shape and 

 nearly closed mantle, with the tongue-shaped foot 

 passing through it ; the siphons are rather long, sepa- 

 rated close to the body, fringed at their openings; 

 the shell is oval, rather flat, thin, with one valve rather 

 deeper than the other ; it is of a dull pale-brownish 

 tint, and the animal is quite colourless ; the hinge has 

 a thick swelling called a fulcrum, with a partly internal 

 ligament and a little free bony plate attached to it by 

 cartilage. The British species are — 



