DESCRIPTION. 143 



Fig. 6. A. grnnosa. 

 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 suborbicuiar, 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 striae extremely fine ; hinge bowed. 



Inhabits the EngHsh and other seas. 



PLATE IX. 



Fig. 1. OsTRE A sudruf a. 

 Shell with 20 finely striated rays. 

 Donovan's British Shells, vol. 1. tab. 12. 

 Specimen, bright yellow with brown beaks; ears 

 transversely striate, thin, 

 inhabits the British shores. 



