FUSUS antiquus. MUELLER. 



Fig. 15. Apertural view of a specimen. Sinistral. Page 23 



a. Posterior canal. 



b. Anterior canal, 

 f. Labrum. 



Faludina listen. HANLEY- 



Fig. 21. Apertural view of a specimen. Dextral. Page 23 



a. Aperture, closed by operculum. 



b. apex. 



Ampullaria bolteniana. CHEMNITZ. 

 Fig. 10. Apertural view of a specimen. Sinistral. Page 2 



Chiton squamosus. 

 Fig. 11. Dorsal view of a specimen. Page 22 



Helix desertorum. FOSSKAL. 

 Fig. 13. View showing animal and manner of bearing shell. Page 22. 



PLATE I. 



PTEROPODA. 



Hyalaea tridentata. LAMARK. 

 Fig. 4. Dorsal view of a specimen. Page 23 



Conularia trentonensis. HALL. 

 Fig. 5. Front view of a specimen. Page 23 



