PLATE LVIII. 



OsTEEA {continued). 

 Pigs. 

 I — 5. 0. semijdana, 8ovf. Zone oi Belemnitella tmicronata, 'Norwich. (P. 379.) 



1. Sedgwick Musoum. (7, ri<,'-lit valve ; h, anterior view. 



2. Norwich Museum, No. 2129. a, right valve; fc, left valve; c, anterior 



view. 



3. Dr. Eowe's Collection. Right valve. 



4. Norwich Museum. One of the types of 0. ala'forini!<, Woodward (pi. vi, 



fig. 3). a, right valve; b, interior. 



5. Norwich Museum, No. 2085. Eight valve. 



(j — 9. 0. ."iaramom.^, Woods. Zone of Adinocamax quadratus, East Hariiliam.- 

 Dr. Blackmore's Collectiou. G, right valve; 7a, 0, left valves; 

 7b, posterior view of 7a ; 8, right valve. (P. 387.) 

 10— lo. 0. Micitrra, Nilss. Right valves. (P. 388.) 



10, 11. Totternhoe Stone (zone of Holaster suhglohosits), Burwell. Sedgwick 

 Museum. 



12. Zone of Terehratulina lata. South Devon Coast. Dr. Eowe's Collection. 



13. Zone of Actinocamax quadratns, East Harnham. Dr. Blacliuujre's 



Collection. 



