1922] NATURAL SCIENCES OF PHILADELPHIA. 45 



actually belong here, this section will be represented around the 

 main West Indian centers of evolution, but is best represented in 

 places where it does not come into competition with the more 

 advanced types of the Helicinidae. 



Section Succincta A. J. Wagner. Mex. to S. A. 



Succincta A. J. W. (1905). Type (by tautonomy) H. succincta von Mar- 

 tens (1890). Mexico. 



Gemma A. J. W. (1907). Type (by tautonomy) H. gemma Preston (1903). 

 Costa Rica. Not Gemma Deshayes (1853) teste Fischer (1885). 

 O. arenicola (Morelet) (1849). Sisal, Yucatan. 

 O. arenicola raresulcata (Pfr.) (1861). Vera Cruz, Mex., sandy. 

 O. arenicola succincta (von Martens) (1890). Cordova, V. C, Mex. 

 O. flavida flavida (Menke) (1828). Described as from Jamacia, but not since found 

 there. Generally recognized as Guat. 



??? H. ambieliana Boissy (1835). Tobago, Antilles; more probably near 

 H. fasciata Lam. 



H. trossula Morelet (1849). Vera Paz, Guatemala. 

 .^O. flavida brevilabris (Pfr.) (1857). Guatemala. A larger form. 



? H. microdina incommoda A. J. W. (1905). Guatemala. 

 O. flavida strebeli (Pfr.) (1861). Mirador, Vera Cruz, Mex. 

 O. oaxacana (Pilsbry) (1920). Puerto Angel, Oaxaca, Mex. 



? H. microdina A. J. W. (1905, 1910), not Morelet (1851). Vera Paz, Guat. 

 O. fragilis fragilis (Morelet) (1851). Peten, Guatemala. 

 O. fragilis elata (Shuttleworth) (1852). Cordova, Vera Cruz, Mex. 

 O. fragilis merdigera (" Salle "Pfr.) (1855). Vera Cruz, V. C, Mex. 



? H. mohriana Pfr. (1861). Orizaba, Vera Cruz, Mex. (intermediate 

 between two). 

 O. oweniana oweniana (Pfr.) (1849). Chiapas, Mex. 

 O. oweniana coccinostoma (Morelets) (1849). Vera Paz, Guat. (very close). 



? H. anozona von Martens (1875). Coban, Guat. (color form). 

 O. beatrix beatrix (Angas) (1879). Costa Rica. 

 ?0. beatrix nicaraguae (A. J. W. ) (1908). Nicaragua. 



??0. beatrix confusa (A. J. W.) (1908). Costa Rica, (figure looks more like next). 

 O. gemma (Preston) (1903). Costa Rica 7 . 



In this section, the radulae of 0. flavida strebeli*, 0. oweniana 

 coccinostoma? , and a form near 0. cacaguelita (Pilsbry and Clapp) 

 (1903) 10 have been examined. The radular formulae of all three 

 forms are shown in Table II, while the first two species are figured. 

 Theradula of 0. flavida strebeli (Plate III, fig. 3; Plate IV, fig. 12) is 

 very similar to that of Oligyra s. s., but shows a divergence in the 



7 H. autoni Pfr. (1848) was described originally without habitat; in Chemnitz 

 it is figured with the habitat Sandwich and Gambier I. (South Pacific); while 

 in 1852, the habitat is given as Honduras. From the figure and description, 

 I doubt if it is an American shell, but consider it near H. pazi " Hidalgo "Crosse 

 (1S65), also from the same general region as the habitat given in the second 

 paper. 



8 1 alcoholic and 5 dried specimens; collected on IT. of Mich. -Walker Exped. 

 in Vera Cruz Mex.; Hacienda Cuatotolapam, Canton Acayucan (1910) 



9 1 dried specimen; A. N. S. P. no. 107628, collected in mts. w. of Livingston, 

 in Guat. by A. A. Hinkley (1913). 



10 2 dried specimens; A. N. S. P. no. 146582; collected at Cincinnati, Sierra 

 Santa Marta Colombia, by Rehn and Hebard. (1920). 



