1922] NATURAL SCIENCES OF PHILADELPHIA. 51 



Caloplisma C. and F. (1893). Type (monotype) H. rostrata Morelet 



(1851). Guatemala. 

 Retorquata A. J. W. (1905). Type (first species) H. zephyrina Duclos 



(1833). Mexico. 

 Turbinata A. J. W. (1905). Type (by tautonomy) H. turbinata "Wieg. 



Menke" Pfr. (1846). Mexico. 

 Rostrata A. J. W. (1905). Type (by tautonomy) H. rostrata Mo. (1851). 



Not Rostrata Gray (1855). 



H. rostrata rostrata Morelet (1851). Vera Paz, Guatemala. 



H. salvini Tristram (1861). Coban, Guatemala. 



H. rostrata simplex C. and F. (1893). 



H. dalli "Bartsch" Fluck (1906). Wani, Nicaragua (bare name). 

 ?H. rostrata mategalpensis A. J. W. (1910). Matagalpa, Nicaragua. 

 H. rostrata denticulata Pfr. (1855). Honduras. 

 H. funcki funcki Pfr. (1849). S. Yago, New Granada. 



H. funcki costaricensis A. J. W. (1905). San Jose and Santa Clara, Costa Rica. 

 ?H. funcki pitalensis A. J. W. (1910). El Pital, Rio Naranjo, s. w. Costa Rica. 

 H. funcki parvidens Pilsbry (1920). Juen Vinas, 3000-3300 ft., Costa Rica. 

 H. zephyrina zephyrina Duclos (1833). Tampico to Nicaragua. 



H. turbinata "Wieg. Menke" Pfr. (1848). 



?? H. ambeliana Sowerby (1842). 



? H. sinuosa Pfr. (1850). Mexico? Monstrosity? 



? H. sandozi Sh. (1852). Monstrosity. 



H. berendti Pfr. (1861). Vera Cruz, Mex. Excavatoangulate var. of 

 Mart. (1908). 



H. turbinata minima Strebel (1873). Not H. minima d'Orb. (1845). 



H. zephyrina elatior "von Marten" C. and F. (1893) = higher race. 

 ??H. zephyrina deppeana von Martens (1863). Oaxaca, Mex. 

 H. zephyrina dientensis Pilsbry (1903). Diente, Nuevo Leon, Mex. 

 H. chrysocheila chrysocheila A. Binney (1851). s. w. U. S (Tex. to N. Mex.). 

 H. chrysocheila shuttleworthi von Martens (1890). Cordova, V. C, Mex. 



H. chrysocheila Sh. (1852), not Binney (1851). 

 H. chrysocheila vanattae Pilsbry (1909). Loj Canoas, San Luis Potosi, Mex. 



Iii this group, the radula of H. zephyrina™ was examined. The 

 radular formula is given in Table III. No cusps are present on 

 the A-central (Plate III, fig. 9) ; the B-central is simply a curved, 

 almost rectangular plate with spatulate crenulations on the upper 

 margin. The lanceolate C-central bears one, large, rounded hook. 

 The comb-lateral (Plate IV, fig. 13) is heavy and bears large, 

 spatulate cusps. The accessory plate is small and has but little 

 reflection of the anterior border. The marginals are large and 

 quite strictly ligulate; the bases form oblique rows but the tips 

 are in nearly transverse rows, at least towards the center. The 

 cusps of each tip form disc-like crowns, with the cusps arranged 

 transversely on each. The calcareous operculum is degenerate, 

 but the horny operculum is thick and brilliantly colored red. 

 This group, to my mind, represents the most complete develop- 

 ment of the genus Helicina on the mainland. 



29 3 alcoholic specimens; University of Michigan-Walker Expedition in South- 

 ern Vera Cruz, Mexico; Hacienda Cuatotolapam, Canton Acayucan (1910). 



