HANNA AND JOHNSON: MOLLUSKS OF KANSAS. 119 



forms of a bidentate miiscorum; one, the most common of the two, has one 

 tooth on the parietal wall and one on the columella; in the other the 

 columella tooth is absent and is replaced by one on the palatal wall. The 

 latter form is what is known as bigranata, but only a few specimens 

 were found, while the former is quite common. All four of these forms 

 intergrade to a remarkable degree, and the fact that all are found in the 

 one locality makes the recognition of subspecies not feasible. 



28. Pupilla blandi Morse. 



This form has three teeth, and the shell is smaller and more cylindrical 

 than P. miiscorum. A few fossils were found. The species now lives in 

 the mountains of Colorado. 



29. Bifidaria mcclungi new species. PI., figs. 1, 2. 



Shell light brownish-yellow ; composed of five to five and a half whorls. 

 Lines of growth faint and apex smooth. Whorls well rounded and suture 

 very deep. Umbilicus barely perforate. Peristome very broadly re- 

 flected and greatly thickened by white callous on the inner margin and 

 the face; ends connected across the body whorl by a heavy callous. 

 Teeth six. One parietal, large; heavy, and strongly bifid. The angular 

 or outer portion from the columella is connected to the peristome by its 

 upper extremity. It descends in a gentle curve and meets the parietal 

 portion near the upper extremity of the latter. Both portions of the 

 tooth are often divided transversely, as shown in figure 2. One columel- 

 lar, large and heavy, and with a small, pointed subcolumellar. This is 

 sometimes partly united to the upper tooth, in which case it is bifid, as 

 shown in figure 1. One basal, small and conical. Lower palatal high and 

 lamellar, set oblique to the aperture, and more deeply seated than the 

 other teeth. Upper palatal small and conical. Immediately above the 

 upper palatal tcoth there is a nodule-like thickening of the margin of 

 the lip. A low callous ridge on the outside of the shell just back of the 

 reflected lip. 



Measurements. 



Alt. Diam. 



2.03 .96 



2.07 1.00 



2.44 1.00 



Types in the U. S. National Museum from the Pleistocene of Phillips 

 county, Kansas. 



This species differs from any other of the procera group of Bifidaria 

 in having the compound tooth on the columella. The very gi-eatly thick- 

 ened and expanded lip is also characteristic. 



30. Bifidaria holzingeri Sterki. 



Three specimens were found associated with Vallonia parvula in loam 

 two feet below the surface. It probably does not extend down into the 

 Pleistocene deposits, and it is doubtful if it lives in the region at the 

 present time. 



