TAB. XIII. 
Fig. 
1 a—d. Cardium Groenlandicum, page 160. 
2a, b. 35 venustum, p. 160. 
3a, b. is nodosulum, p. 154. 
C. < Ps portion of surface magnified. 
4a, b. aA nodosum, p. 153. 
Cs > - portion of surface magnified. 
5a, b _ strigilliferum, p. 154. 
d. ¥ Bs portion of surface magnified. 
C. 5 “9 young specimen, showing the introduc- 
tion of an intermediate ray. 
6 a—e. * angustatum, p. 157. 
Oso: Ps Parkinsoni, p. 158. 
The lines indicate the size of the specumens. 
