198 BULLETIN OF THE 



Sink, Alachua County, Florida, where it was abundant. Some twenty specimens 

 were picked up in a few moments during a hurried visit made with other ends in 

 view, and a quart could easily have been gathered in half an hour. This form is 

 distinguished by its generally smaller size (max. diam. 12.0, min. diam. 10.0, alt. 

 6.0 mm.) as compared with the type (15.0, 12.0, and 7.9 mm.), and by being more 

 closely rolled, thus having not only an actually smaller umbilicus, but one in 

 which one third less of the preceding whorl is visible. The specimens were uni- 

 form iu this, and in all other respects were like the typical auriculata. 



Polygira uvulifera, Shottleworth. 

 auriformis, Bland. 

 Postelliana, Bland. 

 espiloca, Bland. 

 a vara, Say. 

 ventrosula, Pfeiffek. 

 Hindsi, Pfeiffer. 

 Texasiana, Moricand. 

 triodontoides, Bland. 

 Mooreana, w. G. B. 

 hippocrepis, Pfeiffer. 



Through the kindness of Mr. Singerly, I have the opportunity of examining 

 the jaw and lingual membrane. 



Jaw long, low, ends blunt ; anterior surface with over 14 ribs denticulating 

 either margin. 



Lingual membrane long and narrow (Plate III. Fig. 8, a, b). Centrals tri- 

 cuspid, laterals bicuspid, marginals low, wide, irregularly denticulate. Teeth 

 30-1-30, the ninth lateral having its inner cutting point bifid. 



Polygyra Jacksoni, Bland. 



A form was found abundantly near Fort Gibson, Indian Territory, by Mr. 

 C. T. Simpson, who thus describes it in Proc. U. S. Nat. Mus., 1888, p. 449. 



Instead of the bicrural tooth on the body whorl, at the aperture there is a heavy 

 elevated deltoid callus, which is joined to the upper and lower margins of the peri- 

 stome, and which occupies about the same area as the tooth in the type. The num- 

 ber of whorls is 5 ; greater diam. 7, lesser 6, height 3 mm. In examining several 

 hundred specimens, I have found none which approach the type, and I would 

 therefore propose for it the varietal name of deltoidea. 



Polygyra oppilata, Moricand. 

 Dorfeuilleana, Lea. 

 Ariadnse, Pfeiffer. 

 septemvolva, Say. 

 cereolus, Muhlfeldt. 

 Carpenteriana, Bland. 



