Vol. 5] Steams. — John Day and Mascall Mollusca. 69 



regularity of the ribs make this a very pretty shell. The general 

 facies suggests relationship with the extraordinary group of heli- 

 coid forms so widely distributed throughout the vast area denomi- 

 nated by Mr. W. G. Binney, 3 the "Central Province," and listed 

 by Dr. Pilsbury in his recent catalogue as number 340 4 (P. stri- 

 gosa and numerous races or varieties). A comparison of J'. Le 



2 



4 



Fig. 1. Limnaea maxima nom. prov. Natural size. 

 Fig. 2. Pyramidula Le Contei, n. s. X 1|. 



Figs. 3 and 4. Helix (Epiphragmorphora ?) dubiosa nom. prov. Natural 

 size. 



Contei kindly made for me by Professor Dall, with the large 

 series of the strigosa group in the National Museum, determines 

 it, as he says, to be "different from anything we have in the col- 

 lection." 



In memory of the late Professor Joseph LeConte, I have at- 

 tached his name to the above form. 



3 "Manual of American Land Shells," Bull. 18, U. S. National Museum. 



4 "Classified Catalogue of Land Shells of North America," etc. Phila- 

 delphia, April, 1898. 



