37 



Figs. 27. /. neocomicnsis d'Orb., Lower Greensand (Aptian) : left valve. 

 28&29. /. anglicusWoodi^, Eed Chalk : 28, right valve ; 29, anterior. 

 30 & 31. /. jpictus Sow., Holaster-suhglobosus Zone : 30, i-ight valve ; 

 31, anterior. 32 & 33. /. lamarcJci\diV. apicalis Woods, Ehynchonella- 

 cuvieri Zone : 32, left valve ; 33, anterior. 34-38. /. lamarcki Park., 

 Holaster-plamis Zone : 34, left valve ; 35, right valve ; 36, anterior ; 

 37, 38, posterior. 39. /. lamarclci var. we&si'crz Mant., Micraster cor- 

 testudin avium Zone : right valve. 40 & 41. /. lamarcki var. cuvieri 

 Sow., Terebrattdina-lata Zone : 40, right valve ; 41, anterior. All 

 (§0 half of the natural size. 



