25 



appear in the early part of October ; Limncca star/nails, 

 L., being tlie last I have found at tlie surface, and this 

 on the first of November. 



Shell spiral, sj)ire more or less acute, last whirl large, 

 aperture large. 



GENUS LIMN^EA, Lam. 



SUBGENUS LYMNOPHYSA, Fitz. 



1.1.11.^.13 1 REFf.EXl., Say. 



Shell doxtral, elongated, volutions six, wliich are 

 very oblique and wrinkled ; spire acute and long ; 

 l)ody whirl dilated, aperture rather nai-row ; shell i-e- 

 flected from the middle ; length o]ie and on(»- fourth 

 inches. Illinois River. 



i.iinuu>.n pallida, Adams. Shell thill, whirls live; 

 suture marked, horn color, body whirl not much 

 enlarged ; fold upon tlu; columella not large ; length 

 one-half inch. Loc. Fox and Illinois rivers. 



i.imnu^a iDumiii.H, Say. Shell Small, hoHi color ; 

 length 8 mill. Found in swales near Illinois River. 



i.iiiina^a<iesi(iiosa. Say. Shell oblong, spire loug as 

 tlie aperture ; whirls live ; of a yellowish horn color ; 

 length 10 mill. Found in same locality as the preced- 

 ing species. 



n.i:ft.^'.-B3.-l CM PICK. VTA, Say. 



Shell conic, whirls five, suture distinct ; apex acute, 

 whirls wrinkled, and with light colored nwolving lines 

 on the young shell ; aperture dilated, somewhat ; 



