Figs. 56 & 57. /. anglicus Woods, Red Chalk : 56, right valve ; 57, anterior. 

 58 & 59. /. crippsi Mant., Pecten-asper Zone : 58, right valve ; 59, 

 anterior. 60. /. crippsi var. reachensis Eth., Holaster-suhglobosus 

 Zone; right valve. 61-63. I.labiatus Schloth., Ehynchonella-cuvieri 

 Zone: 61, right valve of inconipletelj-grown individual; 62, right 

 valve of fully-grown individual ; 63, anterior view of part of right 

 valve. 64. /. labiatus var. latiis Sow., Holaster-'planus Zone ; right 

 valve. All @ half of the natural size, except fig. 62, which is a 

 third of the natural size. 



