234 



CO'^GIIYLIA—DITHYRA. 50. 



fornicata. 

 10. 



Shell from a quarter to half an inch in diameter, flat, rounded 

 or oblong, sometimes truncate at the top, brown or whitish, covered 

 with concave or j)rickly scales disposed in longitudinal lines down 

 the raised striae ; the under valve sometimes but rarely prickly on 

 the outside. 



Anomia testa suborhiculari, striis minutis, valvd superiori intus sub 



umhonein fornicata. 

 Shell somewhat orbicular and finely striate, the upper valve furnished 



with a vaulted chamber on the inside under the beak. 

 Tab. nost. 18, fig. 12, 13.^ 

 Anomia fornicata. Lamarck, Syst. vi. p. 228. 

 Mus. nost. From Torbay. 



Shell about half an inch in diameter, white and rather flat, 

 orbicular or inclining to oblong, irregularly sinuous on the margin 

 at the sides, with numerous extremely fine radiating striae which 

 are only visible towards the margin, and on the narrower or hinge 

 part are as fine and regular transverse ones : hinge pointed, termi- 

 nal : inside silvery, with fine longitudinal strise round the margin ; 

 and under the hinge is a large hollow vaulted chamber, which on 

 one side is much curved and scaly on the outside ; the under valve 

 is flat and silvery, with the perforation round and nearly closed. 



tubularis. Anomia testd orbiculari, valvd inferioris foramine integro cylindrico- 

 tubulari. 

 Shell orbicular, with the perforation of the under valve entire and 



forming a cylindrical tube. 

 Mus. nost. Attached to Fuci. 



