318 PROCEEDINGS OF THE ACADEMY OF [1896. 



The first and second of these groups consist, at present, of one 

 species each. Strophiops is by far the most numerous in species. 

 We are unable to make any subgeneric division into long- and short- 

 toothed forms ; the various species present a perfectly graduated 

 series. Maynardia Dall and Loiujidens Maynard are, therefore, in 

 our opinion, merely subordinate divisions oi Stroj^hioj'is. 



Genus OERION (Bolton, 1799.) Morch, 1850. 



Morch, Catal. Yoldi, p. 63. Dall. Bull. M. C Z. XXV, No. 9, p. 120 

 Sb-ophia Albers, 1850, not of Meigen, 1832. 



Subgenus EOSTKOPHIA Dall, 1890. 



1. Cerion anodonta Dall.*^ Trans. Wagner Free Inst. Sci., Ill, p. 13, pi. 1, figs. 8c, 

 8d. 



Miocene : Silex Beds, Ballast Point and Old Tampa Bay, West 

 Florida. 



la. Cerion anodonta floridanum Dall.* L. c, fig. 6. 



Miocene : Ballast Point. 



Subgenus CERION «. «?/■. 



Distribution, Curacoa. This is the most distinct of the subordin- 

 ate groups of the genus. The teeth of the inner whorls are frequently 

 absent. 



2. Cerion uva Linne.* Syst. Nat. (10), p. 765. Fer., Hist., pi. 153, f. 11-14. 



Island of Curacoa ! The locality " Guadeloupe " is erroneous. 

 2a. Cerion uva desculptum P. & V.* PI. XI, fig. 1. 

 Curacoa. 



Subgenus STROPHIOPS Dall, 1894. 



Bull. Mus. Comp. Zool. Vol. XXV, p. 121 (October, 1894). 



-\- Maynardia Dall, /. c. (type S. neglecta Mayn.). 



-\-Senictiltis Maynard, Contrib. to Sci., Ill, p. 17 (type S. niumia Brug.). 



-f Umhonis Maynard, Contrib to Sci., Ill, p. 28 (type S. scalarma Gundl ). 



-\- Piyiguitia Maynard, Contrib to Sci._, III, p. 30 (type S. " diinidiada " Pfr.). 



-\-Longidens Maynard. Contrib. to Sci., Ill, p. 39 (type S. pannosa Mayn.). 



-\-Multostrophia Maynard, Contrib. to Sci., II, p. 177 (type S. exintea Mayn.). 



Group of C. punnosum (Longidens Maynard). 



Distribution, Cayman Island.*. Maynard correctly separates this 

 group of species from typical Strophiops. 



3. Cerion nanum Maynard.* Contr. to Sci., i, p. 27. 



Little Cayman. 



^Species and varieties marked with an asterisk (*) are represented in the col- 

 lection of the Academy of Natural Sciences of Philadelphia. 



