PLATE VIII. 



Fig. 



1 . Camaraphoria multiplicata, King. Lateral aspect, of a short variety ; cast, 



natural size. Humbleton Hill. 



2. — — Lateral aspect of the specimen represented by fi^s. 29, 30, 



in Plate VII. 



3. — — Internal view (partly restored), showing plates of the 



arch («) ; supporting plate of do. (p) ; crural base or 

 platform (c) ; boss or cardinal muscular fulcrum {d) ; 

 spatula-shaped process {e) ; supporting plate of do. (/); 

 spurs or crura {g) ; socket-plates {li). Highly magnified. 

 (The socket-plates have inadvertently been marked 6.) 



4. — — Diagram of a longitudinal section of the shell exhibiting 



the different internal structures, as lettered in the last 

 figure. 



5. — — Enlarged view of the platform, spatula-shaped process, 



&c., looking down on them. The letters in the last 

 figures refer to the same structures. Letter g simply 

 represents the origin of the spurs. The upper edge 

 of the plate supporting the spatula-shaped process is 

 indicated by letter/. 



6. — — Enlarged view of the large valve, showing cast of the arch 



{a), and impressions of the veins [i). Humbleton 

 Hill. 



7. — — Enlarged view of the small valve, showing cast of the plate 



supporting the spatula-shaped process (/), and impres- 

 sions of the arteries [j) within the veins. Humbleton 

 Hill. 



8. Camaraphoria Schlotheimi, Von Buck. Figure (natural size) of a cast showing 



lateral marginal expansions, and impressions of the 

 vascular system. Humbleton Hill. 



9. Trigonotreta- cristata, SMotheim. Cast of the large valve, natural size : o, im- 



pression of the ventral median plate ; h, impressions 

 of the dental plates. Humbleton Hill. 

 10. — — Cast of the small valve, natural size : «, impressions of the 



socket plates ; c, impression of dorsal median plate. 

 Humbleton Hill. 



