44 MYA. 



in Lin. Trans, viii. p. 37. Wood's Conch, p. 94. t. 24. 



f. 7 to 9- 

 Chama praetenuis. Petiver Mus. t. 94. f. 4. 

 Inhabits the British Shores. Petiver, #c. 

 Shell about half an inch long, and twice as broad, ovate, nearly 

 flat, brittle, of a whitish colour, and marked with a few fine 

 concentric stria?. The Myae, with spoon-like hinges in Mon- 

 tagu's Supplement, have been formed into a separate genus, 

 with the name of Ligula, but the name had been before ap- 

 propriated by Bloch and Gmelin for a genus of intestinal 

 worms, and it is my present plan to refrain from adopting 

 any alterations in the Linnaean genera. 



anatina. 6. Shell sub-orbicular, covered with de- 

 cussated striae ; hinge with a spoon-shaped 

 tooth. 



Mya anatina. Chemnitz, vi. p. 28. t. 2. f. 13 to 16. Gme- 

 lin, p. 3221. Wood's Conch, p. 94. 



Mya, No. 4. Schroeter Einleitung, ii. p. 015. 



Le Tugon. Adanson. Senegal, p. 263. t. 19. f. 2. 



Erie. Method, t. 229- f. 3. 

 Inhabits the mouths of the Niger. Adanson. 

 The length is about one inch, which scarcely in the proportion 



of a third exceeds either the breadth or the height, when the 



two valves are together. It is said by Adanson to be a thin 



but firm shell, and that the hiatus has a marginated border ; 



the colour is white, and the whole surface is covered with 



longitudinal as well as transverse stria?. 



globosa. 7. Shell suborbicular, with transverse 

 striae decussated on one side; hinge with a 

 spoon-shaped tooth. 



Mya globosa. Wood's Conch, p. 95. t. 24. f. 4 to 6. 



Inhabits 



This species is of the same size, and nearly resembles M. Ana- 

 tina; but instead of being decussated all over, the longitudi- 

 nal striae extend over only half of each valve, and Mr. Wood 

 says that the hiatus terminates in a sharp reflected margin. 



nicobarica. 8. Shell ovate-oblong, with equal 

 valves and decussated striae ; hinge with a 

 broad perpendicular spoon-shaped tooth. 

 Mya nicobarica. Gmelin, p. 3221. Wood's Conch, p. 97. 



