ANOMIA. 280 



Shell about three-eighths of an inch in diameter, marked on 

 the convex valve with longitudinal prickly striae, except on 

 the umbo which is smooth, and the lower valve is porous in 

 concentric rows ; the colour is dirty white or brownish. 



muricata. 8. Shell orbicular, pellucid, with longi- 

 tudinal striae, and vaulted slightly imbricated 

 spines ; summit recurved. 



Anomia muricata. Gmelin, p. 3346. 

 Anomia imbricata. Bruguiere Enc. Meth. p. 73. 

 Anomia, No. 6 and 7- Schroeter Einl. iii. p. 409. 

 Chemnitz, viii. Vign. at p. 65. f. A to D. Enc. Method. 

 t. 171. f. 12 to 15. 



Inhabits the coasts of Guinea ? Chemnitz. 



Shell sometimes nearly an inch and a half in diameter, very 

 thin, and almost as transparent as glass ; the striae on the up- 

 per convex valve are armed with hollow, vaulted, slightly 

 imbricated spines ; the lower valve is flat, and the margin of 

 its perforation elevated. Chemnitz discovered this shell on 

 a keel of a vessel when it arrived from Guinea, and therefore 

 supposes it is an inhabitant of that coast. 



undtjlata. 9. Shell sub-orbicular, with irregular 

 undulated longitudinal strise, and minutely 

 striated transversely. 



Anomia undulata. Chemnitz, viii. p. 88. t. 77. f. 699* 

 Gmelin, p. 3346. Bruguiere Enc. Meth. p. 74. Mon- 

 tagu Test. p. 157, and p. 580. t. 4. f. 6. Maton and 

 Racket, in Lin. Trans, viii. p. 103. Dorset Cat. p. 39- 

 t. 11. f. 4. 

 Anomia, No. 4. Schroeter Einl. iii. p. 408. 

 Ostrea striata. Da Costa Brit. Conch, p. 162. t. 11. f. 4, 



Donovan, ii. t. 45. Montagu Test. p. 153. 

 Lister Anim. Ang. t. 4. f. 27, and Conch, t. 202. f. 36. 

 Enc. Meth. t. 171. f. 16 and 17, and t. 184. f. 5 and 6. 

 Inhabits the coasts of Great Britain. Lister, fyc. Norway 



and the Mediterranean. Chemnitz. 

 Shell about an inch, or an inch and half in diameter, thin, pel- 

 lucid, and marked with fine undulated, longitudinal, rib-like 

 striae, and obsoletely striated transversely ; the lower valve 

 is wholly white, and the upper more or less mottled with 

 reddish brown. 

 vol. i. u 



