PLATE VII. 



AsTROPECTEN Leckenbyi, Wright. 



From the Inferior Oolite. 



Fig. 



1 a. AsTROPECTEN Leckenbyi, Wright, p. 114. Dorsal surface, natural size. 



c. Two of the marginal plates, magnified four times, to show the size and arrangement 



of the tubercles on their surface. 

 h. Lateral view of the same specimen, showing the thickness of the border and a section 



of the marginal plates. 



. AsTROPECTEN SCARBURGENSIS, Wright. 



3 a. AsTROPECTEN ScARBURGENsis, Wright, p. 115. Dorsal surface, natural size. 

 h. Portion of one of the rays, magnified four times, 

 c Two marginal plates, exhibiting the tubercles on their surface. 



