Descriptions of Xew Species and A^eiv Varieties 229 



Parapholyx pusilla. New Species 

 Plate 117, fijis. 1-6 



Shell small, with three whorls, scalariform, the second whorl standing on 

 the body, turban-shaped; sutures distinct. Aperture roundly ovate, lips 

 simple, lower lip rounded at base. Columella callus narrow, not expanded, 

 separated from the columella region where it often projects leaving a dis- 

 tinct umbilical chink. Aperture continuous by the presence of a parietal 

 callus. Sculpture coarse, often costate. 



Shell Maximum Aperture Aperture 



Height Diameter Height Diameter 



4.0 5.0 2.3 2.3 Holotvpe 



4.5 4.3 2.5 2.1 Paratvpe 



4.5 4.5 2.4 2.4 Paratvpe 



Type Locality. Six miles west of Pyramid Lake, Washoe County, 

 Nevada. 



Type Material. One hundred twenty-five specimens taken from a Pleis- 

 tocene deposit by Elbert Howard^ are deposited in the United States 

 National Museum, Accession no. 308925. The individual from this lot 

 chosen as holotype is shown on plate 117 as fig. 1. Figures 2 to 5 on the 

 same plate are of paratypes. 



Parapholyx pusilla differs from Parapholyx rievadensis in that the 

 new species has a more rounded shell, with elevated and turban-shaped 

 second whorl and the lower portion of the aperture lacks the sharp angle 

 caused by the columcllar callus in Jievadensis. The new species differs 

 from P. solida in the form of the spire, aperture and base of lip. 



This is apparently an extinct sj^ecies. 



GENUS Planorhula 



Planorhula smithii. New Species 



Plate 118, figs. 11-12; plate 119, figs. 10-12 



Shell resembling that of wheatleyi but larger, of five whorls, the spire 

 whorls in the same plane and not so sunken toward the nucleus as in 

 wheatleyi; no dorsal ridge as is developed in wheatleyi; umbilical opening 

 wdth the whorls rounded, not flat sided and without the sharp carina dis- 

 tinctive of wheatleyi. Crest behind aperture not as heavy or as thickened 

 as in ivheatleyi. Sculpture of distinct spiral lines. Apertural lamellae as in 

 armigcra not as in wheatleyi. 



Shell Greater Lesser Aperture Aperture 



Height Diameter Diameter Height Diameter 



3.0 7.1 5.5 2.0 1.3 Holotvpe 



2.8 7.0 5.0 1.7 1.0 Paratvpe 



2.9 6.9 5.8 1.5 1.0 Paratype 



Type Locality. Jackson County. Alabama. 



Type Material. Fifteen specimens, collected by H. H. Smith, are de- 

 positee! in the United States National Museum, Accession no. 321196. The 

 holotype is figured on plate 119. as fig. 10; jiaratyjies on the same plate 

 as figs. 11 and 12. 



Externally Planorhula smithii resembles wheatleyi but the newly recog- 

 nized species is readily distinguishable by the absence of the L-shaped 



