U. S. NATIONAL MUSEUM 



BULLETIN 68 PL. I 



5<^ 



6a 



^a 



Sa 



1 . cerrosana, p. 20 



2. bicolor, p. 22 



3. auricotna, p. 20 



Pyramidella 



4. hastata, p. 25 



5. bairdi, p. 19 



6. adamsi, p. 21 



7. mazatlanica, p. 24 



8. panamensis, p. 26 



9. conica, p. 23 



10. achates, p. 27 

 11 . moffati, p. 26 

 1 2. mexicana, p. 23 



