PLATE XLII 



PAGE 



Figs. 1, 2. CF. GOMPHOCERAS PINGUE Hall 318 



1. Part of living chamber. 



2. Septum of preceding, showing position of siphuncle. 



Romney formation, Hamilton member, Western Maryland. 



Fig. 3. GOMPHOCERAS PINGUE Hall 318 



Fragment showing ventricose form and curvature of living chamber 

 toward aperture. Hamilton formation, New York. 



Fig. 4. BACTRITES ACICULATUS (Hall) 319 



Part of an individual. X 1%. Romney formation, Hamilton member, 

 21st Bridge. 



Fig. 5. BACTRITES ACICULUM Hall 320 



Shell slightly crushed. Genesee formation, New York. 



Fig. 6. AGONIATITES EXPANSUS (Vanuxem) 321 



Outline figure showing character of surface stria?. Romney formation, 

 Onondaga member, Cumberland. (After Kindle.) 



Figs. 7, 8. PARODICERAS DISCOIDEUM (Conrad) 323 



Lateral and ventral views. Marcellus formation, New York. 



Fig. 9. CYPHASIS CF. STEPHANOPHORA Hall 326 



Fragmentary glabella. X 5. Romney formation, Onondaga member, 

 Berkeley Springs, W. Va. (After Kindle.) 



125 



