PLATE VI. 

 AsTROPECTEN CoTTEswoLDiyE, var. Stamfordensis, Wright. 



'From tie Stonesfeld Slate. 



Fig. 



1 n. AsTROPECTEN CoTTESWOLDi^E, var. Stamfordensis, Wright, p. 118. Dorsal surface, 



natural size. 

 /;. Two uiarginal plates, with rows of spines at their distal border. 



2 a. AsTROPECTEN CoTTEswoLDi^, Buck., p. 116. Small specimen, natural size. 



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

 distal spines, and connecting ossicula, magnified. 



AsTROPECTEN Hastingi^, Forbes. 



From the Marlstone. 



8 a. AsTROPECTEN Hastingi.e, Forb., p. 113= Dorsal surface, natural size. 

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



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

 showing the ambulacral avenues, natural size. 

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

 same, magnified three diameters. 



