ANOMIA. 297 



placenta. 29. Shell orbicular, flat, and pellucid ; 

 hinge with two ribs spreading like the letter 

 V on the inner surface of one valve. 



Anomia Placenta. Linnesus Syst. Nat. p. 1154. Bom 



Mm. p. 120. Chemnitz, viii. p. 116. t. 79. f. 716. 



Schroeter Einl. iii. p. 404. Gmelin, p. 3345. Brooks s 



lntrod. p. 81. t. 4. f. 46. 

 Placuna Placenta. Solanders MSS. Lamarck Syst. des 



Anim. p. 135. 

 Placuna. Enc. Meth. t. 173. f. 1 to 3. 

 Lister Conch, t. 225. f. 60, and t. 226. f. 6\. Seba, iii. t. 



90. f. 5, 6, 12 and 13. Knorr, ii. t. 24. f. 1. Da Costa's 



Elements, t. 7. f. 13. Favanne, t. 41. f. D 2. 

 Inhabits the coasts of Tranquebar and China. Chemnitz. Co- 



roniandel. Humphreys. 

 Shell about five inches in diameter ; white, pellucid, thin, brit- 

 tle, and marked with very fine longitudinal stria; crossing 

 transverse wrinkles ; the upper valve is flatter than the other* 

 and the inside is silvery ; the hinge has two longitudinal ribs 

 diverging like the letter V on the inner surface of one valve, 

 and two corresponding hollows in the other valve. The 

 Chinese are said to glaze the windows of their summer- 

 houses with these shells. 



sella. 30. Shell sub-quadrangular, and the hinge 

 with two ribs spreading like the letter V on 

 the inner surface of one valve. 

 Anomia Sella. Gmelin, p. 3345. 

 Anomia, No. 16. Schroeter Einl. iii. p. 415. 

 Ephippium Anglicanum maximum. Chemnitz, viii pill 



t. 79- f. 714. ' 



Placuna Ephippium. Solander's MSS. Callone's Cat 



p. 45. No. 827. 

 Placuna. Enc. Meth. t. 174. f. 1. 



Seba, iii. t. 90. middle fig. Knorr, iv. 1. 18. f. 2. Favanne, 

 t. 41 . f. D 3. 

 Junior. Ephippium parvum papyraceum. Chemnitz, viii. 

 p. 114. t. 79. f. 715. 

 Placuna. Enc. Meth. t. 174. f. 2. 



Rttmphius, t. 47. f. B. Petiver Amb. t. 20. f. 3. Gualter, 

 t ; 104. f. B. 

 Inhabits the coasts of Amboyna. Rumphius. Molucca Islands. 



Chemnitz. Tranquebar. Humphreys. 

 Shell from four to seven inches long, and the breadth but very 



