1896.] NATURAL SCIENCES OF PHILADELPHIA. 319 



4. Cerion copium Maynard.* Contr. to Sci., i, p. 22. 

 Cayman Brae. 



4a. Cerion copium parvum Maynard.* Contr. to Sci., i, p. 24. 

 Cayman Brae. 



5. Cerion glaber Maynard.* Contr. to Soi., i, p. 25, 

 Cayman Brae. 



5a. Cerion glaber perplexum Maynard.* Contr. to Sci., i, p. 71. 

 Cayman Brae. 



6. Cerion levigatum Maynard.* Contr. to Sci., i, p. 12. 

 Little Cayman. 



S.f estiva Mayn.* t. c, p. 17, is a more variegated form. 



6a. Cerion levigatum acutum Maynard.* Contr. to Sci., i, p. 15. 



S. nitela Mayn.,* t. c, p. 73. 

 .S". picfa Mayn.,* A c., p. 18. 



These seem to be very elosely allied, differing from acutum merely 



in size and degree of mottling. 



Little Cayman. 



7. Cerion pannosum Maynard.* Contr. to Sci., i, p. 10. 



S./usca Mayn.* /. c, p. 77. Seems to be the same thing differing only "in 

 color. 



S. intermedia Mayn.* /. c , p. 13. A smaller form. 



Little Cayman. 



8. Cerion lineotum Maynard.* Contr. to Sci., i, p. 20. 



Little Cayman. 



Gronp of C. maritimum. 



9. Cerion dimidiatum Pfr. Zeitschr. f. Mai., 1847, p. 16. 



F. proteus Gnndlach mss., Pfr., Malak. Bl., VII, 1860, p. 19; Novit. Conch, 

 t. 66, f. 13-22, 



Gibara, Cuba. 



An altogether ribless form occurs. The species varies toward the 

 following. 



10. Cerion incrassatum Sowb.* C. Icon., XX, pi. 1, f. 6. 

 Cuba, Gibara. 



10a. Cerion incrassatum microdon P. & V.* PI. XI, fig. 5. 

 Cuba. 



11. Cerion multicostum KUster.* Conchyl. Cab., p. 77, t. 11, f. 6, 7. 

 Punta Maisi, Cuba. 



