4 ANOMIA. BQJ? r L-SHELL. 



5. Anomia aculeata. Prickly Bowl-shell. 

 Montagu, pi. 4. f. 5. 



Shell roundish, or inclining to oblong, sometimes 

 wrinkled, thin, transparent ; the upper valve flat, covered 

 with concave scales disposed in longitudinal rows, which 

 enlarge towards the margin, with a small and somewhat 

 inflected beak ; lower-valve scaly, smooth, or a little spi- 

 nous towards the margin : color dirty white, brownish 

 or yellowish, silvery within ; the perforation near the 

 hinge : diameter about a quarter of an inch. 



In the many specimens which we have examined from 

 the English and Irish coasts, both loose and attached to 

 the roots of Fuci, we have never been able to observe the 

 numerous rows of concentric pores on the under-valve 

 mentioned by Mr. Dillwyn, but have often found this valve 

 prickly for the greater part of its surface. 



Southern coasts of England and Ireland, v. v. 



6. Anomia undulata. Striated Bowl-shell. 



Lister ,pl. 202. f. 36, and pi. 203. f. 37 Montagu, pi. 4. 

 f. 6 DorsetCat.pl. ll.f. 4. 



Ostrea striata. Da Costa, pi. 11. f. 4 Donovan, 

 pi. 45. 



Shell roundish, more or less inclining to oblong, rather 

 flat, thin and transparent , the upper valve somewhat 

 fiexuous and produced on one side under the hinge, like the 

 valves of the Tellina flexuosa, with longitudinal ribs, which 

 in the young shells are regular and quite straight, but in 

 the older ones more or less undulated and branching into 

 each other or divided, especially towards the front, giving 

 the margin a notched appearance j the interstices trans- 

 versely rugged or striate : beak small, pointed, scarcely 

 reaching to the margin ; under-valve thin, flat, scaly, and 

 ribbed, with an oval perforation under the hinge : color 

 whitish or brownish, with more or less of a purple red or 

 yellow cast, and iridescent when the outer coat is rubbed 

 off; inside ribbed, glossy, with usually a dull oblong chalky 

 patch below the hinge : length an inch or more ; breadth 

 not so much. 



On the English and Irish coasts, v. v. 



7- AiiQinia 



