1922] NATURAL SCIENCES OF PHILADELPHIA. 49 



over the nucleus; this thickening is peculiarly dead- white to bluish. 

 Probably most of the rather elevated, carinate or subcarinate 

 species of HeMcina of the Andes belong here. I hope to treat 

 them more fully in a future paper, as I have a number of specimens 

 from the foot-hills of the Andes, near the Venezuela-Colombian 

 border. 



Section Tamsiana A. J. W. Northern South America. 



Tamsiana A. J. W. (1907). Type (by tautonomy) H. tamsiana Pfr. (1850). 

 Venezuela. 



In this section, the radulae of H. tamsiana appuni von Martens 

 (1873) 21 and H. nemoralis Guppy (1866) 22 have been examined. 

 I expect to describe them more fully in a future paper, as I have 

 numerous specimens of this group, from various localities in the 

 Cumbres Mts., Venezuela. The radular formulae are shown in 

 Table III. 



Although nearest Oxyrhombus, both in shell and radular characters, 

 this group shows certain resemblances to HeMcina s. s., on account 

 of the more rounded cusps on the comb-lateral and the rather 

 peculiar development of the A-central. The marginals are strictly 

 ligulate. The operculum is similar to that of Oxyrhombus in tex- 

 ture, but H. sanctaemarthae Pilsbry and Clapp (1902), which probably 

 belongs here, has the best development of the calcareous plate that 

 I have seen in any true Helicina. 



Section Angulata A. J. W. 1905. South America to Central America. 



Angulata A. J. W. (1905). Type (by tautonomy) H. angulata Sowerby 



(1842). Brazil. 

 Variabilis A. J. W. (1905). Type (by tautonomy) H. variabilis Wagner 



(1827). Brazil. 



?H. candeana "d'Orbigny" Sowerby (1842). Bay of Honduras. 23 



?H. oxyrhyncha Crosse and Debeaux (1863). Habitat ??. A little larger shell.. 



?H. oxyrhinca of authors. 



??H. rhynchostoma from Central America, of authors. 



?H. pterophora Sykes (1902). Guatemala 24 . 



?H. oxyrhyncha Wagner (1910). Isle of Bonacca, Bay of Honduras 25 . 



21 2 alcoholic specimens; collected for Univ. of Mich. Museum, near Palma 

 Sola, Estado Falcon, Venezuela (1920). 



22 1 dried specimen; A. N. S. P. no. 14610; collected (by Guppy?) in Island of 

 Trinadad. 



23 Not in d'Orbigny (1835 or 1837). As Sowerby says this shell is smooth, 

 it cannot be candeana of authors, from Venezuela (Cf. H. rhynchostoma ernesti 

 von Martens (1873), as that form has 'very evident spiral striaticns. 



24 Ancey (1904) says this is identical with oxyrhyncha; the figures and des- 

 cription certainly coincide very well with candeana. 



25 There may be a mainland and an insular subspecies, but they are not separ- 

 able from the descriptions or figures. 



