BRITISH FOSSILS. 



1 



Spe- 

 cimen. 



Height. 



Length. 



JBreaulh. 



Form of 

 hinder dorsal inter 

 ambulacral area. 



Contour of 

 the dorsal surface. 



3 



9 6 



Q G 



3 



Carinated 



Wide and rather 



A 



4 





Q G 



3tV 





Garinated 



TV^ide and very 

 flat. 



5 



9 6 



q 2 

 «JX2^ 



9 4 

 ^T2 



Much carina- 

 ted and ele- 

 vated. 



Gently declining 

 from apex. 



6 



2A 



9 * 



i ^ 





Rounded 



Gently curving. 



7 







2A 



Carinated 



Gently curving. 



8 



111 



12 



211 



172 



2tV 



Carinated 



Flattened slightly. 



9 





9 5 



m 



Carinated 



Flattened. 



10 



111 



9 6 





Carinated 



Gently curving, 

 and slightly 

 flattened. 



1 1 



O 1 



2x2- 



O 4 



9 1 



^T2- 



Carinated 



Curving. 



12 



9 3 



2A 



9 3 



Carinated 



Flattened. 



13 







2A 



Carinated 



Rapidly curving, 

 and flattened 

 behind. 



14 



9 2 



2-R 



2A 



Sub-carinated 



(Tumid below, and) 

 Conic above. 



15 



9 5 



24f 



12 



Carinated 



(Tumid below, and) 

 Conic above. 



16 



1 8 

 '^12^ 



lA 



^12 



Carinated 



Conical, with 

 slightly curved 

 sides. 



17 



9 2 



2A 



1 9 

 ^T2 



Sub-carinated 



Pyramidal, with 

 straight sides. 



The last specimen in this table is the original example of Anan- 

 chytes pyramidata of Portlock, and the most extreme of all the 

 varieties. 



Locality and Oeological Position. J. ovata is a characteristic 

 fossil of the White Chalk, and is found abundantly in the south-east 

 of England, especially in Kent, Surrey, Sussex, and the Isle of Wight. 

 It occurs in both middle and lower parts of the series. Forma 5 

 suhglobularis and ^ striata are prevalent in the Lower Chalk. In 



