PLATE XVI 



PAGE 



Figs. 1, 2. PYROPSIS TROCHIFORMIS (Tuomey) Gabb 446 



1. Ventral view. 



2. View of spire. 



Monmouth formation, Brightseat, Prince George's County. 



Fig. 3. PYROPSIS LENOLENSIS Weller 453 



View of squeeze of mold of exterior. Matawan formation, locality 

 unknown. 



Fig. 4. PYRIFUSUS sp. (immature) 463 



View of squeeze of mold of exterior. Monmouth formation, 2 miles 

 southwest of Oxon Hill, Princs George's County. 



Figs. 5, 6. PYRIFUSUS MONMOUTHEXSIS Gardner n. sp 459 



5. Dorsal view. 

 6 Ventral view. 



Monmouth formation, Brightseat, Prince George's County. 



Figs. 7-9. PYRIFUSUS MARYLANDICUS Gardner n. sp 457 



7. Dorsal view of cast. X 2. 



8. Ventral view of same. X 2. 



9. View of squeeze of mold of exterior. X 2. 



Monmouth formation, Brightseat, Prince George's County. 



Fig. 10. PSEUDOMELAXIA Mox MouTiiExsis Gardner n. sp 480 



Ventral view. X 3. Monmouth formation, Brightseat, Prince George's 

 County. 



912 



