PLATE XXXVIII 



PAGE 



Figs. 1-3. TENTACULITES BELLULUS VAR. POTOMACENSIS Prosser n. var 303 



1. View of external impression. X 1%. 



2. Squeeze of same, showing the external appearance of the species. 



xi%. 



3. Same specimen enlarged to show annulations and transverse striae. 



X 4. 

 Romney formation, Hamilton member, McCoys Ferry. 



Fig. 4. CONTJLARIA UNDULATA Conrad 304 



Side view of shell. Hamilton formation, New York. 



Figs. 5-8. COLEOLUS TENUICINCTUS Hall 305 



5. Two specimens, showing concentric striae; median longitudinal 



groove due to fracture. 



6. Part of right hand specimen of preceding enlarged, showing appear- 



ance of transverse striae. X 3. 



Romney formation, Hamilton member, Evitts Creek. 



7. An imperfect specimen. 



8. A fragment enlarged. 



Hamilton formation, New York. 



Fig. 9. BACTRITES ACICULUS 320 



Fragment of tube. Romney formation, Onondaga member, Sassin, Va. 

 (After Kindle.) 



Figs. 10, 11. ORTHOCERAS BEBRYX Hall (?) 307 



10. Internal impression of part of an individual. Oldtown Road near 



Cumberland. 



11. Enlargement showing surface markings. X 4. Great Cacapon. 



Romney formation, Hamilton member. 



Fig. 12. ORTHOCERAS BEBRYX Hall 307 



A much compressed and weathered fragment, with the siphuncle ex- 

 posed. Hamilton formation, New York. 



121 



