138 MACTRA. 



marked 'with numerous concentric ridges, except at the urn- 

 bones, which as well as the inside are said to be glabrous. 



radiata. 17. Shell sub-triangular, thin, brittle, 

 compressed, with fine transverse and minute 

 longitudinal striae. 



Mactra radiata. Donovan, v. t. 161. Maton and Racket, 



in Lin. Trans, viii. p. 69. 

 Cardium edentula. Montagu Supp. p. 29. 



Found upon Langston beach near Portsmouth after a severe 

 storm, by Mr. Laskey. Donovan. 



Shell about two inches and a half long, and three inches broad, 

 covered with a brownish epidermis, beneath which it is 

 white, tinged with flesh colour, and faintly marked with lon- 

 gitudinal testaceous rays ; the posterior end is rounded, and 

 the anterior somewhat angulated ; it is wrought with stria; 

 in both directions, of which the longitudinal ones are more 

 numerous, and more minute ; the hinge has a central depres- 

 sion, with the rudiment of a minute oblique denticle, and a 

 small lamina on each side. Mr. Montagu says, it resembles 

 Cardium lavigatum, which is only applicable to its form. 



stultorum. 18. Shell sub-triangular, diaphanous, 

 smooth, obsoletely radiated, and the umbonal 

 region gibbous ; inside purplish. 



Mactra stultorum. Linn&us Syst. Nat. p. 1126. Chem- 

 nitz, vi. p. 226. t. 23. f. 224 to 227. Schroeter Einl. 

 iii. p. 77. Gmelin, p. S258. Montagu Test. p. 94. 

 Donovan, iii. t. 106. Maton and Racket , in Lin. Trans. 

 viii. p. 69. Dorset Cat. p. 32. t. 8. f. 3. Lamarck 

 St/st. des Anim. p. 121. Brooks's Introd. p. 62. t. 2. 

 f. 21. 



Tellina radiata. Pennant Brit. Zool. iv. p. 87. t. 49- f. 

 30. 



Trigonella radiata. Da Costa Brit. Conch, p. 196. t. 12. 

 f. 3. 



Gualter, t. 71. f. C. Adanson Senegal, t. 17. f. 16.? 

 Knorr, vi. t. 5. f. 1. Born. Mus. Vign. at p. 50. Erie. 

 Meth. t. 256. f. 3. 

 Inhabits the European Ocean. Linnmus. Mediterranean and 



West Indies. Chemnitz. Coasts of Britain. Pennant, fyc. 



North America. Solander. 

 The length is most commonly about an inch and a half, the 



breadth au inch and three quarters, and the height rather 



