PLATE XXXVII 



PAGE 



Pigs. 1-3. PLATYCERAS ERECTUM Hall (?) 296 



1. Lateral view of partly exfoliated specimen. X 1*4. 



2, 3. Two views of exfoliated specimen, wrinkled by crushing toward 



the margin. X 1*4. 



Romney formation, Hamilton member, Hancock-Harrisonville 

 Road, about 2 miles north of Hancock. 



Figs. 4, 5. PLATYCERAS ERECTUM Hall 296 



Two views of specimen from Hamilton formation of New York. 



Fig. 6. PLATYCERAS CF. SYMMETRTCUM Hall 297 



Dorsal view of partly exfoliated specimen. Romney formation, Hamil- 

 ton member, Evitts Creek. 



Figs. 7-12. DIAPHOROSTOMA LINEATUM (Conrad) 298 



7. Lateral view. 



8. Enlarged portion of same to show surface markings. X 7. 



Romney formation, Hamilton member, Ernstville. 



9. The aperture and spire of a symmetrical specimen. 



10. Lateral view of the same. 



11. Side view of a specimen preserving the surface in great perfection. 



12. Enlargement of the surface of the preceding. 



Hamilton formation, New York. 



Figs. 13-15. PLATYSTOMA CF. EUOMPHALOIDES Conrad 299 



Upper, side and lower views. Hamilton formation, New York. 



Fig. 16. (?) GASTROPOD. 



Squeeze from external impression (?). X 10. Romney formation, 

 Hamilton member, road east of Pine Hill, about 4 miles north 

 of Oldtown. 



Figs. 17-20. STYLIOLIXA FISSURELLA ( Hall) 300 



17. Lateral view of small specimen. X 6. 



18. Similar view of larger specimen. X 6. 



Romney formation, Hamilton member, Iron Bridge over Town 

 Creek, northeast of Oldtown. 



19. Specimen strongly striated longitudinally. X 6. 



20. Specimen showing transverse and longitudinal striae. X 6. 



Marcellus formation, New York. 



Fig. 21. TENTACULITES ATTEXUATUS Hall 301 



Specimen showing internal impression for larger end and external 

 impression for the remainder. X 5. Romney formation, Hamil- 

 ton member, National Road, west of Tonoloway Ridge. 



Figs. 22-25. TENTACULITES BELLULUS Hall 302 



22. External impression. X 3. 



23. Same enlarged to show annulations and fine transverse striae. X 8. 



Romney formation, Hamilton member, Iron Bridge over Town 

 Creek, northeast of Oldtown. 



24. A specimen showing the general features of the species. 



25. Enlargement of the same showing annulations and encircling 



striae. 



Hamilton formation, New York. 



