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Plate XV. Fig. 1 — 5. Stenopus cruentatus 527 



1. Animal repens auctum. 



2. ad latus visum. 



3. Discus gressorius angustatus. 



4. Testa prona. 

 5. supina. 



6 — 10. Helicina Occidentals 529 



6. Pullus. 



7. Animal retractum. 



8. repens. 



9. Testa. 



10. Operculum. 



Plate XVI and 



XVII. Osteology of the Chlamyphorus truncatus. 544 

 Fig. 1. The entire Skeleton. 



2. The head, front view. 



3. Upper jaw, and under surface of the 



head, seen from below. 



4. Lower jaw, side view. 



5. Cervical vertebrae, first bone of the 



sternum, with parts of the 1st and 

 2d ribs, seen from below. 



6. The Pelvis, seen from behind. 

 '7, seen from below. 



8. Caudal vertebrae. 



9. Truncated extremity and tail. 



