450 THE CHICAGO ACADEMY OF SCIENCES. 



lightly appressed to the parietal wall, where it shows as a very thin 

 wash of callus; the anterior part of the lip is reflected over the um- 

 bilicus, leaving a very small chink, axis slightly twisted, forming a more 

 or less distinct, ascending plait. 



Length. Width. Aperture length. Width. 



12.00 8.50 8.00 5.00 mill. Type. 



11.50 7.50 7.25 4.50 " 



12.00 7.75 7.00 4.00 " 



11.00 6.75 6.25 3.75 " 



15.25 9.25 10.50 3.50 " 



11.00 6.75 6.50 3.75 " 



15.10 10.00 10.00 5.00 " Spokane Falls. 



14.00 8.50 8.80 4.50 " 



TYPES : Chicago Academy of Sciences, five specimens, No. 23720 ; 

 cotypes, Academy of Natural Science, Philadelphia ; Coll. A. A. Hink- 

 ley. 



TYPE LOCALITY : North fork Snake River, East Idaho. 



ANIMAL, JAW, RADULA and GENITALIA : Not examined. 



RANGE: Idaho and Oregon. Columbia River drainage (Co- 

 lumbian region). 



RECORDS. 



IDAHO: North fork Snake River, Fremont Co. (H. O. Hinkley). 



OREGON: Snake (Lewis) River (ELaldeman). 



GEOLOGICAL DISTRIBUTION : Unknown. 



ECOLOGY: Not recorded. 



REMARKS: Hinkleyi is related to both binneyi and apicina, but 

 differs from both in being much thinner, more tumid, the inner lip is 

 narrower, the umbilical chink smaller and the axis more twisted. The 

 whole shell is more fusiform in outline. Hinkleyi varies somewhat in 

 the elevation of the spire, but otherwise seems very uniform. The 

 spire is decollated in most of the specimens examined. It was thought 

 at first to be binneyi, but the shell is much smaller and thinner with no 

 umbilicus. 



The species is named in honor of Mr. A. A. Hinkley, Du Bois, 

 Illinois, in whose collection the shells were found. 



Galba preblei (Ball). Plate XXV, figures 7-10. 



Lymn&a (binneyi var.?) preblei DALL, Alaska Mollusks, p. 70, pi. 1, figs. 

 1, 2, 1905. PILSBRY, Nautilus, XIX, p. 95, 1895. 



Lymnaa binneyi DALL, Alaska Moll., p. 69, 1905 (part). 



Limnaa ampla BINNEY, Proc. Phil. Acad., p. 330, 1861; L. & F.-W. Sh. 

 N. A., II, p. 31, 1865 (part). 



