CONCHOLOGY. 49 



L. Pennsylvanica. L. reticulata. 



L. mutabilis. L. carnaria. 



L. squamosa. L. concentrica. 



L. Peruviana. L. fimbriata. 



8. Genus Donax. 

 Animal. As in Tellina. 



Shell. Transverse, inequilateral, equivalve ; anterior side short 

 and obtuse ; tv^'o primary teeth in one or both valves ; one or two 

 lateral teeth varying in distance ; two round muscular impressions ; 

 ligament, external, short, and inserted at the posterior impression. 

 Inhabits the seas of Europe. Twenty-eight species. 



Donax pubescens. Donax'columbella. 



D. cuneata. D. australis. 



D. radians. D. bicolar. 



D. abbreviata. D. merois. 



D. ringens. D. scripta. 



D. Cayennensis. D. trunculata. 



D. denticulata. D. flabagella. 



D. cinatina. D. Martiniaensis. 



D. cardioides. D. triquetra. 



D. scorta. D. rugosa. 



D. compressa. D. elongata. 



D. deltoides. D. granosa. 



D. veneriformis. D. epidermia. 



D. vittata. D. minima. 



9. Genus Caps a. 

 Animal. As above. 



Shell. Transverse, equivalve, valves approximate and close : 

 three primary teeth in the right valve, and a single bifid tooth in 

 the left, inserted into a cavity in the opposite one ; no lateral 

 teeth; ligament external and on the short side, as in Donax. 

 Inhabits the Indian Ocean. Three species. 



Capsa levigata. Capsa Braziliensis. 



C. Donaoides. 



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