TAB. XIII. 



Fig. 

 1 a — d. Cardium Groenlandicuni, paye IGO. 



„ venustum,^. 160. 



,, nodosulum, />. 154. 



„ „ portion of surface magnified. 



,, nodosum, p. \Wi. 



„ „ portion of surface magnified. 



„ strigilliferum, /I. 154. 



„ ,, portion of surface magnified. 



„ „ young specimen, showing the introduc- 



tion of an intermediate ray. 



„ angustatura, /I. 157. 



„ Parkinsoni, yj. 1.58. 



The linen indicate the size of the s-pecimens. 



