290 ANOMIA. 



Shell about an inch and a quarter, or sometimes an inch and 

 a half long, and the breadth rather exceeds the length ; the 

 colour is greyish white, and the inside of the flattest valve 

 has a curiously folded, gristly appendage, extending from the 

 hinge. 



psittacea. 27. Shell ovate, gibbous, longitudi- 

 nally striated, with the umbo of the convex 

 valve much produced and perforated ; mar- 

 gin sinuated, entire. 



Anomia Psittacea. Gmelin, p. 3348. 



Anomia Rostium-psittaci. Chemnitz, viii. p. 106. t. 78. f. 



713. 

 Anomia aquilina. Solanders MSS. 

 Anomia, No. 14. Schroeter Eint. iii. p. 413. 

 Lampas Psittacea. Cal/one's Cat. p. 45. No. 834. 

 Terebratula. Erie. Method, t. 244. f. 3. 

 Lister Conch, t. 21 1. f. 46. Argenville, t. 23. f. O. Klein 

 Ost. t. 1 2. f. 84. D 'Avila, t. 20. f. B. Favanne, t. 

 41. f. A 5. 



Inhabits the Indian Seas. D' Avila. Coasts of Greenland. 

 Chemnitz. Newfoundland. Humphreys. 



Shell about three-quarters of an inch long, and the length ra- 

 ther exceeds the breadth ; it is somewhat horny, pellucid, 

 and finely striated longitudinally ; the valve which has the 

 produced perforated summit is less convex than the other, 

 and the perforation is somewhat triangular ; the colour is 

 blackish or greenish brown. 



TRIDENTATA. 28. Shell tricuspidatcd with tubular 

 points, thin, pellucid, and finely striated 

 transversely ; valves united. 



Anomia tridentata. Forskael Descrip. Anim. in Itin. p. 

 124, and t. 40. f. B. Chemnitz, viii. p. 108. Vign. 13. 

 fig. F and G. Gmelin, p. 3348. 

 Anomia, No. 15. Schroeter Einl. iii. p. 414. 

 Hyalaea cornea. Lamarck Si/st. des Anim. p. 140. 

 Hyale tridentata. Shaw Nat. Misc. xvi. t. 664. 

 D 'Avila, t. 20. f. D and E. 



Inhabits the Mediterranean. Forskael. 



Forskael describes this singular species to be as large as a nut, 

 of a yellowish colour, and very thin and pellucid ; the sum- 

 mit is rounded, the base mucronated, and each side is armed 

 with a projecting tube. 



