PLATE XXXVI 



PAGE 



Figs. 1-3. BELLEROPHON (BUCANOPSIS) LEDA Hall 285 



1. Dorsal view, showing surface markings. X l a /4. Romney forma- 



tion, Hamilton member, Evitts Creek. 



2. Dorsal view of specimen with finely preserved surface. X 2. 



3. View of one side of dorsal surface, showing surface markings. X 3. 



Hamilton formation, New York. 



Figs. 4-7. CYRTOLITES (CYRTONELLA) MITELLA Hall 288 



4. Dorsal view of specimen which is crushed on right side. X 1^4. 



5. Dorsal view of smaller specimen which is distorted toward the 



front. X l 1 ^. 



Romney formation, Hamilton member, road east of Pine Hill, 

 about 4 miles north of Oldtown. 



6. Dorsal view of partly exfoliated specimen. 



7. Side view of the type, an internal impression. 



Hamilton formation, New York. 



Figs. 8, 9. CYCLONEMA LIRATUM VAR. GRABAUI Prosser n. var 290 



8. Squeeze from an external impression, showing part of the body 



whorl, the spire and surface markings. X 1%. 



9. Probably the internal impression of the body whorl of the same 



specimen. X 1^4. 



Romney formation, Hamilton member, Williams Road, about 

 3^ miles southeast of Cumberland. 



Fig. 10. CYCLONEMA ( ?) MARYLANDENSE Prosser n. sp 292 



Side view, showing the surface markings. Romney formation, Hamil- 

 ton member, right bank of Potomac River, 4 miles below Cum- 

 berland. 



Fig. 11. NATICOPSIS sp. undet 293 



Lateral view. X 4. Romney formation, Onondaga member, Ridge- 

 ville, W. Va. 



Figs. 12-15. MACROCHILUS HAMILTONI^; Hall 293 



12, 13. Dorsal and ventral views of internal impression. Romney 



formation, Hamilton member, Western Maryland. 

 14, 15. Views of the opposite sides of the type. Hamilton formation, 



New York. 



Figs. 16-19. LOXONEMA HAMILTONI.E Hall 294 



16. Dorsal view, showing strong longitudinal striae. X 1%. 4^ miles 



northeast of Oldtown. 



17. Body whorl, showing longitudinal striae. X 2. Evitts Creek. 



Romney formation, Hamilton member. 



18, 19. Dorsal and ventral views of specimen of usual size. Hamilton 

 formation, New York. 



119 



