326 PROCEEDINGS OF THE ACADEMY OF [1896. 



58. Cerion eximeum Mayn.* Contr. to Sci., 1894, Vol. 2, p. 177, f. 59. 



Cat Island. We have a small form ; alt. 145-18 mm. from San 

 Salvador. 



58a. Cerion eximeum agrestinum Mayn.* Contr. to Sci., 1894, Vol. 2, p. 179, f. 60. 

 New Providence. A pure white specimen was collected by Mr. W. 

 Bendall, and kindly presented to the Academy, with others varying 

 from sparsely to heavily marked. The claim of this variety to dis- 

 tinction rests solely on its locality. The shells of eximeum and 

 agrestinimi are often indistinguishable. 



59. Cerion multistriatum Pils. &, Van.* PI. XI, fig. 8. 

 Crooked Island. 



Grou]) of C. vulneratum. 



60. Cerion infiatum Mayn. Contr. tu Sci., I, p. 126. 

 Galena Point, Auklin Is. 



61. Cerion marmoratum Pfr.» Zeitschr. f. MaL, 1847, p. 83: Conch. Cat., t. 19, f. 

 10-12. 



Cat Island, Bahamas (according to Bland.). 



62. Cerion vulneratum Kiister.* Conch. Cat., p. 161, t. 19, f. 16-18. 

 Gibara, Cuba. 



Subgenus DIACERION Dall, 1894. 

 Bull. Mus. Comp. Zool. 1804, Vol. XXV, p. 122. 



Group of C. striatellum {Paracerion Pils. & Van., 1895.) 



See Proc. Acad. Nat. Sci. Phila., 1895, p. 206. 



Distribution, Cuba. Maynard's name Tridentistrophia (Contrib. 

 to Sci., Ill, p. 9, 1896) is a synonym. The group has much affinity 

 with Diacerion, but the parietal folds are short. 



63. Cerion tridentatum P. & V.«- Proc. A. N. S., 1895, May 4, p. 206. PI. XI, fig 27. 

 Cuba. 



64. Cerion striatellum Fer.* Icon. Kegne Animal, Moll., 1829-1843, p. 60, t. 6, 

 f. 12. 



Cabo Cruz, Cuba. 



65. Cerion basistriatum P. <fe V.* Proc. A. N. S., May 4, 1895, p. 206. 

 Cabo Cruz, Cuba. 



Group of C. rubicundum (Diacerion Dall). 



Distribution, Inagua. The species or forms of this group form an 

 excessively complex problem, which is far from being satisfactorily 



