434 PROCEEDINGS OF THE ACADEMY OF [PaRT II 



Figs. 11, 12. — Area tolepia crassicardinis Pils. & Johns. Type. 

 Figs. 13, 14. — Area tolepia seapularis Pils. & Johns. Type. 

 Figs. 15, l&.—Area eycHca Pils. & Johns. Type. 



Figs. 17, 18, 19, 20. Area perfaeeta Pils. & Johns. Type and another speci- 

 men. 



Plate XL. — Fig . 1. — Area grandis Brod. Santo Domingo. No. 2720. 

 Figs. 2, 3. — Area chiriquiensis Gabb. Chiriqui. Type and paratype. 

 Figs. 4, 5, 6. — Area chiriquiensis Gabb. Santo Domingo. No. 2722. 



Plate XLI. — Figs. 1, 2, 3. — Area ehiriquiensis Gabb. Chiriqui. No. 2724. 

 Fig. 4.— Area e. websteri Pils. Type. 

 Figs. 5, 6. — Area dolaticosta Pils. & Johns. Type. 

 Fig. 7. — Tellina errati Pils. & Johns. Type. 

 Fig. 8, 9. — Area devexa Pils. & Johns. Type. 



Plate XLIl. — Figs. 1, 2. — Divarieella proletaria Pils. & Johns. Type. 

 Figs. 3, 10. — Area idiodon Pils. Type. Wilmington, N. C. 

 Figs. 4, 5, 6. — Area pomponiana Pils. & Johns. Type and paratype. 

 Figs. 7, — Glyeymeris approximans Gabb. Type. Alt. 8.6 mm. 

 Figs. 8, 9. — Glyeymeris diffidentice Pils. & Johns. Tj^e. 

 Fig. 10. — Area idiodon Pils. Type. 



Fig. 11. — Glyeymeris approximans Gabb. Large specimen, alt. 21 mm. 

 Figs 12, 18. — Glyeymeris santodomingensis Pils. & Johns. Type. 

 Figs. 13, 14. — Area muliilineata Gabb. Type. 

 Fig. 15. — Turritella sidcigyrala Pils. & Johns. Type, 

 ^igs. 16, 17. Turbo dominieensis Gabb. Type and paratype. 

 Fig. 18. — Glyeymeris santodomingensis Pils. & Johns. Type. 



Plate XTjIII. — Fig. 1. — Anomia gabbi Pils. & Johns. Type. 



Figs. 2, 3. — Ostrea bolus Pils. & Johns. Type and paratype. 

 Figs 4, 5. — Spondylus gumanomoeon Brown & Pils. Paratype and type. 

 Fig. 6. — Pteria inornata (Gabb). Type. 



Fig. 7. — Pteria inornata {Gahh). No. 2641. An internal cast. 

 Figs. 8, 9. — Amusium papyraeeum (Gabb). Type and internal cast of an- 

 other valve. 



Plate XlilV. — Figs. 1, 2. — Pecten soror (Gabb). Concave valve and detail o 

 sculpture Type. 



Figs. 3, Q.—Peeten thetidis Sowb. No. 2858. 

 Figs. 4. 5. — Pecten thetidis pelei Pils. & Johns. Type. 

 Figs. 7, 8, 9.— Pecten isehnon Pils. & Johns. Type and paratype. 



Plate XLV. — p'igs. 1, 2. — Pecten plurinominis Pils. & Johns. Type. 

 Fig. 3. — Pecten interlineatus Gabb. Type. 



Figs. 4, 5, 6.^ — Pecten oxygonum Sowb. No. 2867, with detail of basal margin. 

 Figs. 7, 8. — Pecten augustieostatus Gabb. Type, with detail of basal edge 



of same. 

 Fig. 9. — Pecten iiselmoe Pils. & Johns. Type. 

 Fig. 10. — Venericardia aversa Pils. & Johns. Type. 

 Fig. 11 — Pecten inaequalis Sowb. No. 2847. 

 Fig. 12. — Pecten eccentrieus Gabb. Type. 

 Fig. 13.— Pecten correctus Pils. & Johns. Type. 

 Fig. 14. — Venericardia seabrieostata Gabb. Type. 



Plate XLVI. — Figs. 1, 2. — ■Echinochama yaquensis trachyderma Pils. & Johns. 

 Type and paratype. 

 Fig. 3. — Lueina mauryce Pils. & Johns. Type. 

 Fig. 4, 5. — Metis efferta Pils. & Johns. Type. 

 Fig. 6. — Lueina bulla (Gabb). Type. 

 Fig. 7. — Metis ehipolana Dall. No. 2671. 



