CONCUR LIA—DITHYR A. 14. 43 



Shell four inches long-, and twice as much broad, coarse, 

 wrinkled transversely in a laminar manner, of a yellowish or 

 ochraceous color, ohliquely truncate at the anterior end, and 

 rregular at the margin. 



14. ANATINA— LAMARCK. 



jTesta transversa vel suhorhicularis, incequivalvis, utrinquh vel 

 latere antico hiante. Cardo dente dilatato concavo intemh 

 piominulo in utrdque valvd : lateralibus nullis. Ligamentuni 

 externum, breve. 



Shell transverse or somewhat orbicular, inequivalve, open at the 

 anterior or both ends. Hinge with a dilated concave tooth 

 projecting a little inwiirds in each valve: lateral teeth none. 

 Ligament external, short. 



This is a very natural genus, and well merits the attention of 

 such conchologists as may have opportunities of examining care- 

 fully the rocky parts of our coasts ; as we are inclined to think, 

 that some very distinct species may yet remain to be discovered. 



And for the purpose of clearer and more decided discrimina- 

 tion, a careful examination of the teeth or spoon-shaped cavities, 

 may ofler much fatility; some of them being placed in an oblique 



G 2 



