PLATE XXV. 



Platyceras milleri. 



Fig. 1. Anterior view of a specimen. Page 165 



Platyceras conicum. 



Fig. 2, 11. Dorsal view of two specimen, showing variation in size. Page 161 



Platyceras bucculentum. 







Fig. 3. Anterior view of a specimen. Page 160 



Platyceras multispinosum. 



Fig. 4. View of a cast of a very large specimen. Page 166 



Platyostoma lineata, var. callosa. 



Fig. 5-7. Apertural, side and dorsal view of a specimen. Page 184 



Platyceras compressum. 



Fig. 8, 9. Dorsal and posterior view of a specimen. Page 162 



Platyceras ventricosum. 



Fig. 6. Anterior view of a specimen. Page 168 



