1911.] NATURAL SCIENCES OF PHILADELPHIA. 373 



Fig. S. — Drillia zooki n. sp. 



Fig. 9. — Conus cemulator n. sp., X 2. 



Figs. 10, 11. — Drillia isthmica n. sp. 



Plate XXIV. — Figs. 1, 2. — Cancellaria dariena trachyostraca n. subsp. 

 Figs. 3, 4. — Cancellaria dariena Toula. 



Figs. 5, 6. — Cancellaria decaptyx n. sp., two views of the type. 

 Fig. 7. — Mitra, sp. undet., part of the columella. 



Fig. 8. — Mitra, sp. undet., internal cast, No. 5,515, coll. Princeton Uni- 

 versity. 

 Fig. 9. — Mitra dariensis, n. sp. 

 Fig. 10. Marginella gatunensis n. sp. 

 Fig. 11. — Mitra longa Gabb, Gatun specimen. 

 Fig. 12. — Marginella coniform is Sowb., vai. 

 Fig. 13. — Marginella leander n. sp. 

 Fig. 14. — Solenosteira dalli n. sp. 



Plate XXV. — Figs. 1, 2. — Phos gatunensis Toula. 

 Fig. 3. — Phos subsemicostatus n. sp. 

 Fig. 4. — Metula gabbi n. sp. 

 Fig. 5. — Anachis fugax n. sp. 



Figs. 6, 7. — Strombina cyphonotus P. and J., n. sp., Santo Domingo. 

 Fig. 8. — Metula gabbi n. sp. 



Figs. 9, 10. — Strombina prisma J. and P., n. sp., Santo Domingo. 

 Figs. 11, 12. — Strombina lessepsiana n. sp. 



Plate XXVI. — Fig. 1. — Murex polynematicus n. sp. 

 Fig. 2. — Murex gatunensis n. sp. 

 Fig. 3. — Strombus gatunensis Toula. 



Figs. 4, 5. — Strombus gatunensis Toula, No. 5,512, coll. Princeton University. 

 Fig. 6. — Typhis gabbi n sp. 

 Fig. 7. — Strombus (?) sp., internal cast. 

 Fig. 8. — Distorsio gatunensis Toula. 



Figs. 9, 10. — Cyproca henikeni Sowb., smoothish var., No. 5,511, Princeton 

 University. 



Plate XXVII. — Fig. 1. — Turritella mimetes n. sp. 

 Figs. 2, 3. — Turritella altilira Conrad. 

 Figs. 4, 5. — Turritella gatunensis Conrad. 

 Figs. 6, 7. — Natica, sp. undet. Internal cast. 

 Fig. 8. — Leda bedboce n. sp. 



Fig. 9. — Turritella gatunensis Con. Pseudomorph in calcite. 

 Fig. 10. — Turritella sapotensis n. sp., Sapote, Costa Rica. 

 Figs. 11, 12. — Niicula (Acila) isthmica n. sp. 



Plate XXVIII. — Fig. 1. — Clementia dariensis Conr. 



Fig. 2. — Pecten scissuratus Dall. Typical form from Santo Domingo. 



Fig. 3. — Pitar eora n. sp. 



Fig. 4. — Pecten effossus n. sp. 



Fig. 5. — Pecten scissuratus Dall. Santo Domingo. 



Fig. 6. — Pecten effossus n. sp. 



Fig. 7. — Pecten toulce n. sp. 



Fig. 8. — Chione tegulum n. sp. 



Fig. 9. — Glycymeris carbasina n. sp. 



Fig. 10. — Glycymeris canalis n. sp. t- ' 



Fig. 11. — Cardium stiriatum n. sp. 



Plate XXIX. — Figs. 1, 2. — Ostrea gatunensis n. sp. 



