NO. 2023. A BRACKISH WATER PLIOCENE FAUNA— DALL. 235 



PALUDESTRINA CURVA, new species. 

 Plate 22, fig. 4. 



Shell of about six whorls, which are notably rounded, giving a con- 

 stricted aspect to the suture; surface smooth, polished; aperture 

 entire, ovate; the peristome sunple with a marked chink behind the 

 iimer lip. Length, 3.5; maxunum diameter, 2 mm. 



Station 6040, near .Alexandria, Louisiana, Matson. Type, U. S. 

 Nat. Mus., No. 166308. 



This species is less elevated than P. aldricM, and has much more 

 rounded whorls than P. turricula. 



PALUDESTRINA CINGULATA, new species. 

 Plate 22, fig. 1. 



Shell small, slender, regular, with about 6 whorls, evenly rounded 

 and with a distinct suture; surface polished, sculpture only of faint 

 spiral grooves of which 1 or 2 near or in front of the periphery are 

 more pronounced than the others; apex rather blunt, smooth; aper- 

 ture ovate, simple, the peristome not reflected, simple, interrupted by 

 the body over which there is a moderate coat of enamel; there is no 

 umbilicus, but a minute chink behind the pillar lip. 



Length, 4.6; diameter, 1.5 mm. 



Station 6040, near Alexandria, Louisiana. Type, U. S. Nat. Mus., 

 No. 166304. 



PALUDESTRINA TURRICULA, new species. 

 Plate 22, fig. 9. 



Shell small, compact, acute, of about 6 whorls ; nucleus very small, 

 blunt; surface of subsequent whorls smooth, polished, the incremental 

 Imes and occasional faint microscopic spirals form the only sculpture. 

 The whorls are somewhat straight-sided, and the portion immediately 

 m front of the suture is compressed into a small rounded shoulder 

 which gives a turriculate aspect to the spire. Length, 4; diameter, 

 1.75 mm. 



Station 6040, near Alexandria, Louisiana. Type, U. S. Nat. Mus., 

 No. 166307. 



This species is very common along with P. aldriclii, which is differ- 

 entiated by its more elongate form, its rounded whorls, and more 

 slender shell. The aperture m both species is exactly alike except 

 for the little curve corresponding to the shoulder of the whorl. 



PALUDESTRINA MILIUM, new species. 

 Plate 22, fig. 2. 



Shell minute, ovate, of nearly 5 whorls ; apex minute, rather blunt, 

 last whorl much the largest; suture distinct, surface smooth and pol- 



