322 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.37. 



OMPHALINA PITTIERI, new species. 

 Plate 33, figs. 2, 7, 8. 



Shell with depressed broadly conic spire, thin, semitransparent, of 

 lieht olive color. Nuclear whorls two and one-fourth, vitreous with 

 a few feeble distant axial striations in the early portion. On the 

 later they become gradually stronger and closer spaced until they 

 assume the character of the sculpture of the succeeding turns. Post- 

 nuclear whorls well rounded, marked by numerous quite regular, 

 closely crowded, decidedly retractive, axial riblets. Sutures well 

 impressed. Periphery of the last whorl well rounded, marked by the 

 continuations of the axial riblets. Base broadly, openly, umbili- 

 cated, well rounded, marked by the continuations of the axial riblets, 

 which are less strong here than on the upper surface. In addition to 

 these riblets the base is marked by quite evenly distributed, strongly 

 impressed axial lines which lend it the appearance of being rather 

 coarsely ribbed. These impressed lines are much more distantly 

 spaced than the riblets on the spire and are strongest within the um- 

 bilicus. Entire surface minutely spirally striated. Aperture sub- 

 circular, its walls very thin. 



The type (Cat. No. 207783 U.S.N.M.) was collected by Prof. H. 

 Pittier at Alta Vera Paz, in the vicinity of Secanquim, Guatemala, 

 at an altitude of 550 meters. It has 6^ whorls and measures: Alti- 

 tude 21.0 mm., greatest diameter 33.4 mm., lesser diameter 29.0 mm. 



The present species is related to 0. euryomphala Pfeffer, but is 

 smaller and has the whorls more rounded. This difference in the 

 whorls renders the aperture of euryomyhala oval, while that of 

 pittieri is almost circular. 



Named for Henry Pittier. 



EUGLANDINA PILSBRYI, new species. 



Plate 33, fig. 5. 



Shell elongate ovate, chocolate brown. Nuclear whorls four, 

 marked by fine retractive axial riblets, which have a tendency to 

 form two series, one a little stronger than the other, the two alternat- 

 ing. Succeeding whorls almost four, moderately rounded, shoul- 

 dered at the summit, marked by irregular and irregularly slanting 

 sinuous, strong axial riblets, which extend equally strong over the 

 entire surface of the whorl. In addition to the axial sculpture the 

 intercostal spaces show traces of spiral striation at irregular intervals. 

 Sutures strongly marked. Periphery and base well rounded, the 

 latter slightly produced. Aperture auriculate, chocolate brown with 

 a bluish cast within; posterior angle acute; outer lip thin, sinuous. 



