DESCRIPTION. 
131 
nal margin crenate, internal one entire ; area with 
angular brown lines and impressed marks. 
Inhabits the Mediterranean, Red, Atlantic, and 
Indian Seas. 
Fig. 6. A. granosa. 
Shell subcordate with muricated ribs. 
Lister Conch. Tab. 241, Fig. 78. 
Specimen white, nearly equilateral ; ribs 20, 
tuberculate with obtuse spines. 
Inhabits the Indian and American Ocean. 
Fig. 7. A. Glycymeris. 
Shell suborbicular, gibbous, substriate. 
Lister Conch. Tab. 247. Fig. 82. 
Specimen white, marked with irregular, inter- 
rupted, transverse bands, and angular lines of red- 
dish brown, white within ; the longitudinal and 
transverse strise extremely fine ; hinge bowed. 
Inhabits the English and other seas. 
— ^ — - 
PLATE IX. 
Fig, 1. OsTREA Radula. 
Shell sub-equivalve, with 12 convex rays, and 
decussate, crenate striae. 
