PLATE VI. 



AsTROPECTEN CoTTEswoLDiiE, var. Stamfordensis, Wriglit. 

 From the Stonesfield Slate. 



Fig. 



1 n. AsTROPECTEN CoTTESWOLDi/E, var. Stameordensis, Wright, p. 118. Dorsal surface, 



natural size. 



h. Two marginal plates, with rows of spines at their distal border. 



2 n. AsTROPECTEN CoTTEswoLDiiE, Buck., p. 116. Small specimen, natural size. 



h. Four marginal plates of this specimen, showing the sculpture on their surface, the 

 distal spines, and connecting ossicula, magnified. 



AsTROPECTEN HastingiyE, Forbos. 

 From the Marlsfone. 



3 a. AsTROPECTEN HASTiNGiiE, Fovb., p. 113 Dorsal surface, natural size. 

 b. Marginal plates and inter-marginal ossicles of the same, magnified. 



4 a. AsTROPECTEN HASTiNGiiE, Forb. Ventral surface of Mr. Leckenby's specimen, 



showing the ambulacral avenues, natural size. 

 b. Angle-plates, ambulacral avenues, biserial pores, and inter-ambulacral plates of the 

 same, magnified three diametci's. 



