PLATE CLXI. 



MACTRA RADIATA. 



RADIATED MACTRA. 



GENERIC CHARACTER. 



Animal a Tethys. Shell bivalve, sides unequal. Middle tooth com- 

 plicated, with a little groove on each side ; lateral tooth remote. 



SPECIFIC CHARACTER 



AND 



SYNONYMS. 



Shell thin, fragile, somewhat triangular, compressed, whitish, and 

 finely striated with testaceous rays. 



Mactra radiata : testa tenui fragili subtriangulari compressa 

 albida subtilissime striata testaceo radiata. 



Several valves of this shell were found upon Langston beach, near 

 Portsmouth, after a severe storm that happened in the year 1800, 

 by J. Laskey, Esq. of Crediton ; from whom we received the spe- 

 cimens figured in the annexed plate. 



This is a thin, brittle shell, of a large size ; colour sordid white, 

 tinged with reddish, and faintly marked with rays of a testaceous 

 colour, beneath a brown filmy epidermis. 



E 3 



