PLATE 2 



Dentatus Zone Indices 

 Hoplites (Isohoplites) eodentatus Casey 

 Figs, i a, b. Lateral and peripheral views X i of an example from Bed i, eodentatus Subzone, 

 Coney Hill Sand pit, Tandridge, Surrey. (BMNH. C 76480) 



Lyelliceras lyelli (d'Orbigny) 

 Figs. 2 a, b. Lateral and peripheral views X 1 of an example from Division 2 (iv), lyelli Sub- 

 zone, Horton Clay Pit, Upper Beeding, Sussex. (BMNH. C 76481) 



Hoplites (Hoplites) spathi Breistroffer 

 Figs. 3 a, b. Lateral and peripheral views X 1 of a late mutation from Bed 4, upper part of 

 the spathi Subzone, Buckland Sand & Silica Co. pit, Reigate, Surrey. (BMNH. C 76483) 



Hoplites (Hoplites) dentatus (J. Sowerby) 

 Figs. 4 a, b. Lateral and peripheral views X 1 of a late mutation from the same bed and 

 locality as Figs. 3 a, b. (BNMH. C 76482) 



(All specimens author's coll.) 



