468 LUCINID-ffl. 



ribbed, as well as concentrically striated. Ligament concealed 

 between the valves. 



Autillarum, Reeve. obliqua, Reeve. 



exasperata, Reeve. occidentalis. Reeve. 



fibula, Adams and Reeve. pecten, Lam. 



imbricatula, C. B. Adams. punctata, Linn. 



insculpta, Reeve. ramulosa, Gould. 



interrupta, Lam. rugifera, Reeve. 



munda, A. Adams. tigerina, Linn. 



Sub-gen. miltha, H. and A. Adams. 



Shell inequivalve, with the surface of the valves nearly 

 smooth. Hinge with the lateral teeth obsolete. 



* 



Childreni, Gray. 



Sub-gen. myrtea, Turton (Cyrachsea, Leach). 



Shell somewhat compressed, with the surface of the valves 

 lamellated, imbricated, or decussated. Hinge with a single 

 cardinal tooth in one valve, and two in the other. 



fabula, Reeve. scabra, Lam. 



Layardi, A. Adams. spinifera, Mont. 



lenticula, Reeve. Strangei, A. Adams. 



muricata, Spengl. venusta, Phil. 

 ochracea, Reeve. 



Genus loripes, Poli. 



Animal with a greatly-prolonged, contractile anal tube. 



Shell thin, orbicular ; surface of valves concentrically 

 striated or lamellated ; beaks small, inflexed ; lunule short. 

 Hinge with a single primary tooth in the right valve, and 

 two very small primary teeth in the left valve ; lateral 



