PLATE LIII. 



Inoceramus (continued). 

 Figs. 

 1, 2. I. Lamarcki var. Websteri, Mant. Upper Chalk. (P. 318.) 



1. Upper part of zone of Holaster planus, Borstal pit. Mr. Dibley's Collec- 



tion. Right valve. 



2. Zone of Micraster cor-testudinarium, Chelsham, Surrey. British Museum, 



No. L21 76. a, right valve (the anterior part concealed by flint) ; 

 b, posterior view. 



3. /. Lamarcki, Park. Southeram, Lewes (probably zone of Holaster 

 planus). British Museum, No. 4767. The Type of I. undulatus, 

 Mant. a, left valve ; b, dorsal view. (P. 319.) 



4 — 6. 1. Lamarcki var. apicalis, Woods. (P. 319.) 



4. Zone of Ehynchonella Cuvieri, Hitchin. Sedgwick Museum, a, right valve ; 



b, anterior view. 

 5 Zone of Rhynchonella Cuvieri, Peter's pit, Burham. Mr. Dibley's 



Collection. Left valve. 

 6. Zone of Holaster planus, Newmarket. Sedgwick Museum, a, left valve ; 



b, anterior view. 



7. /. Lamarcki var. Cuvieri, Sow. Zone of T erebratulina lata, Royston. 



Sedgwick Museum. Right valve. (P. 320.) 



8. J. cordiformis, Sow. Zone of Micraster cor-anguinum, Gravesend. 



British Museum, No. 43277. The Type, a, left valve ; b, dorsal 

 view of both valves. (P. 334.) 



