232 MALACOZOA. TROPIOPODA. LAMELLIBRANCHIATA. 



4. Anomia aculeata. Prickly Scale-Oyster. 



Shell roundish, thin, opaque, white ; the upper valve little 

 convex, with numerous radiating lamelloso-spinous ridges, the 

 umbo glossy, and projecting beyond the margin; the lower 

 valve flat, or slightly convex, frequently costate and spinous 

 like the upper, the aperture roundish. Diameter about half 

 an inch. 



Not uncommon on shells, crabs, stones, and fuci ; often in 

 deep water ; found by me at Aberdeen in September, 1 841 ; 

 at Peterhead by Mr. Alex. Murray, in September, 1842. 



Anomia aculeata. Mont. Test. Brit. 157. PI. 4. f. 5. Anomia 

 aculeata. Turt. Brit. Biv. 233. Anomia aculeata. Flem. Brit. 

 Anim. 396. Anomia aculeata. Penn. Brit. Zool. Ed. 2. iv. 233. 



5. Anomia punctata. Pustulated Scale-Oyster. 



Shell orbicular, thin, transparent, white or yellow ; the upper 

 valve little convex, undulatingly rugose, with irregularly dis- 

 posed pustular prominences ; the umbo rather small, convex, 

 obtusely pointed, curved, not projecting beyond the margin. 

 Diameter about half an inch. 



Found by me, in August, 1 842, among shells on the beach, 

 near Don-mouth ; and subsequently in various places. 



Anomia punctata. Gmel. Syst. i. 3346. Anomia punctata 

 Turt. Brit. Biv. 232. PL 18. f. 11. 



6. Anomia cylindrica . Lamellate Oval Scale-Oyster* 



Shell subovate, thin, subpellucid, white ; the upper valve 

 very convex, concentrically squamoso-rugose, the umbo convex, 

 glossy, narrowed to an obtuse decurved point, projecting far 

 beyond the lower valve ; which is flat, irregularly striate or 

 lamellate, with the aperture large, roundish. Length about a 

 fourth of an inch, breadth a third or a fourth less. 



It varies considerably in form, being oblong, ovate, or 

 roundish. 



First found by me on Sertularise on the beach near Tar- 

 bathie ; afterwards on various corallines, and the roots of 

 fuci. Also at Cruden, Peterhead, and Banff. 



Anomia cylindrica. Gmel. Syst. Nat. 3346. Anomia cylindrica. 

 Penn. Brit. Zool. iv. 233. Anomia cymbiformis. Mont. Test. 

 Brit. Suppl. 64. Anomia cyliudriea. Turt. Brit. Biv. 232. Ana- 

 inia cylindrica. Flein. Brit. Anim. 396. 



