46 CONCHOLOGY. 



2. Genus Psammobia. 

 Animal. Unknown. 



Shell. Transverse, oblong-ovate, or elliptical, flattened, slightly 

 gaping at one side ; summits projecting ; hinge formed by two 

 primary teeth in the left valve, and one in the opposite one. 

 Inhabits the European seas. Eighteen species. 



Psammobia virgata. Psammobia alba. 



P. ferroensis. P. cayennensis. 



P. vespertina. P. laevigata. 



P. florida, P. tellinella. 



P. muculosa. P. pulchella. 



P. caerulescens. P. aurantia. 



P. elongata. P. fragilis. 



P. flavicans. P. livida. 



P. sqamosa. P. galathea. 



3. Genus ■Psammotsea. 



Animal. Unknown. 



Shell. Of the same form as the Psammobia, but differing in 

 the number of teeth, the left valve of the Psammotaea having only 

 one tooth ; and sometimes one valve is without teeth, while the 

 other has two ; ligament exterior, attached to callosities at the 

 hinge, and without an irregular plait. Inhabits the Australian 

 seas. Seven species. One fossil species. 



Psammotaea violacea. Psammotaea Candida. 



P. zonalis. P. tarentina. 



P. pellucida. P. donacina. 



P. serotina. 



N. Tellirina. Seven Genera. 

 The two last of these genera have no lateral teeth, the rest have 

 one or two. 



4. Genus Tellina. 



Animal. Body triangular, much compressed ; the free edge of 



the mantle furnished with a row of tentacular largest and longest 



in the rear ; foot very large, compressed and pointed to the front ; 



buccal appendages nearly as large as the bronchial laminae, of 



