MALACOZOA. TROPIOPODA. LAMELLIBRANCHIA TA. 231 



they have grown in the opposite direction to that of the Pecteu 

 on which they have lived. This property which the Anomiae 

 have of assuming and retaining the impression of the foreign 

 bodies to which they adhere ought to vender us very circum- 

 spect in defining species." 



Common on stones, live and dead shells, crustacea, and 

 tangles. 



Auoraia Epliippium. Linn. Syst Nat. i. 1150. — Anemia Ephip- 

 pium. Penn. Brit. Zool. iv. 109. PI. 62; Ed. 2. iv. 232. I'l. 6J.— 

 Anemia Epliippium. Flem. Brit. Anim. 395. — Anemia Ephippium. 

 Turt. Brit. Biv. 227. PI. 18. f. 1,2, 3.— Anemia Ephippium. Lamk. 

 Syst.vi. 1, 226; Ed. 2,vii. 273. — Anemia patellaris. I amk. Syst. vi. 

 2,' 227; Ed. 2. vii. 273.— Anemia Ephippium. Mont. Test. Brit 155. 



2. Anomia Squamula. Thin Scale-Oyster, 



Shell roundish, very thin, semitransparent, white ; the upper 

 valve little convex, even, with the heak small, glossy, rather 

 pointed, and projecting beyond the margin; lower valve ex- 

 tremely thin, glossy, uneven, concentrically striated, with the 

 aperture circular; the opercidar plate extremely thhi. Dia- 

 meter nearly an incii. 



On live and dead shells, crabs, and stones, along the rocky 

 coasts, and often in deep water. 



Anomia Squamula. Linn. Syst. Nat. i. 1151. — Anemia Squa- 

 mula. Turt. Brit Biv. 229. PI. 18. f. 5,6,7. — Anemia Squammula. 

 Penn. Brit Zoel. iv. 109; Ed. 2. iv. 232. — Anomia Squamula. 

 Mont. Test. Brit. 156. — Anomia Squamula. Flem. Brit. Anim. 

 395. — Anemia Squamula- Lamk. Syst vi. 1, 228; Ed. 2. vii. 275. 



3. Anomia undiddta. Undulated Scale-Oyster. 



Shell roundish, moderately thin, white or reddish ; the upper 

 valve convex hi various degrees, concentrically squamoso-ru- 

 gose, radiated v/ith irregular undulated slender ribs, running 

 out a little on the margin, the umbo convex, not projecting, 

 the inside generally greenish, glossy, or somewhat iridescent, 

 with a subcentral opaque white patch ; the lower valve irre- 

 gular, thin, with the aperture large, communicating with the 

 margin by a slit. Diameter about an inch and a-half. 



Not uncommon on shells, crustacea, and stones, off Aber- 

 deen. Found also by Mr. Alex. Murray, near Peterhead. 



Anomia undulata- Gmel. Svst. Nat. 3346. — Anemia undulata. 

 Mont Test Brit 157. PI. 4/f. 6.— Ostrea striata. Mont. Test 

 Brit. 153.— Anemia undulata. Turt Brit. Biv. 230. PI. 18. f. 8,9, 

 10. — Anomia undulata. Flem. Brit Anim. 395. 



