PLATE VIII. 



Fig. 



1 — 4. Ammonites Coupei. 



la and 6. Tuberculated variety ; from the Chloritic Marl of Bonchurch, 

 Isle of Wight, in the collection of Mr. Saxby. 



2a and b. Commonest of the species ; from the Chalk with siliceous grains 

 of Chardstock, in the collection of Mr. Wiest. 



2c. Outline of the septum of a young specimen of the tuberculated variety. 



3. Outline of the septum of the specimen, fig. 2a. 



4. Tuberculated variety, young ; from the Chalk with siliceous grains of 



Chardstock, in the collection of Mr. Morris. The lateral tubercles 

 have been partially rubbed off. 



i) — 10. Ammonites varians. 



ba, b, and c. Common form of the species ; from the Chalk with siliceous 

 grains of Chardstock, in the collection of Mr. Morris. 



6a and b. Broken specimen of the same variety as fig. 5, showing the 

 form of the shell when young ; from the Chalk with 

 siUceous grains of Chaldon, in the collection of Mr. Morris. 



la and b. Ribbed variety with obsolete lateral tubercles ; from the Chalk 

 with siliceous grains of Chardstock, in the collection of 

 Mr. Morris. 



8a and b. Another variety ; from the Chalk with siliceous grains near 

 Lyme Regis, 



9a and b. Smooth variety ; from the Chalk with siliceous grains of 

 Chardstock, in the collection of Mr. Wiest. 



1 Oa, b, and c. Young specimen of a smooth variety ; from the Chloritic 

 Marl of Bonchurch, Isle of Wight. 



