228 THE CHICAGO ACADEMY OF SCIENCES. 



Acad., VI, p. 161, pi. 24, fig. 76, 1866; Obs., XI, p. 117, pi. 24, fig. 76, 1867.— Scud- 

 der, Bull. Nat. Mus., 23, pp. 149, 201, 1885. 



Limnaea smithsoniana Tryon, Con. Hald. Mon., p. in:; (77), pi. 18, fig. 2, 

 1872. 



Limnophysa s»iitlisoniana Tryox, Amer. Journ. Conch., I, p. 253, 1865. 



Shell: Ovately-elongated, turreted, rather solid; color yellowish 

 horn to brown, sometimes black; surface dull to shining; lines of 

 growth very fine, crowded, irregular ; shell encircled by numerous equi- 

 distant, heavily impressed spiral lines which give the shell a rather 

 latticed or wavy appearance ; these spiral lines appear at first to be 

 elevated, this effect being caused by the epidermis standing erect in 

 the otherwise impressed spiral lines ; this epidermis may be scraped 

 or brushed off, after which the surface resembles the other Lymnaeas 

 with spiral lines; whorls 6-6*/2, very convex; spire acutely conic, gen- 

 erally longer than the aperture; nucleus consisting of one and a third 

 whorls, in outline resembling the nucleus of Galba bulimoidcs techella 

 (pi. XLIX, fig. C), sculpture of satin finish and color generally deep 

 wine or brown; sutures very heavily impressed; aperture ovate, its 

 terminations more or less rounded, frequently reddish or purplish 

 within ; peristome thin, sharp, thickened by an internal rib, which is 

 edged with dark purple ; inner lip reflected over the umbilicus to form 

 a wide, smooth, triangular expansion, without a columellar plait; pa- 

 rietal callus very thin ; axis thickened but not twisted ; umbilical chink 

 open, generally rather wide and deep. The surface of the shell is 

 frequently marked by two. three or more rest periods, showing as 

 heavy yellowish longitudinal bands ; the spiral lines are so heavy that 

 they may be plainly seen on the inner whorls of the shell when broken 

 open. 



Length. 



Width. 



Aperture length. 



Wi 



dth. 





12.00 



5.00 



5.00 



3.00 



mill. 



Say's specimen 



11.50 



6.25 



5.50 



3.00 



" 



Type Smithsoniana 



11.00 



5.50 



4.50 



3.00 



'•' 



Type ferrissi 



17.00 



7.50 



7.00 



4.00 



" 



Lake Albert Lea 



15.75 



7.50 



6.50 



3.50 



" 



Des Moines, Iowa 



16.75 



8.25 



7.00 



3.90 



" 





13.75 



7.00 



6.50 



3.25 



" 



" " 



13.50 



6.50 



5.80 



3.00 



" 



Joliet, 111. 



13.75 



6.75 



6.25 



3.30 



u 



Moran, Iowa 



14.50 



6.50 



6.25 



3.50 



" 



Emerson, Manitoba 



14.00 



7.00 



6.25 



3.50 



" 



Boulder, Colo. 



13.00 



7.00 



6.00 



3.00 



" 



" 



9.00 



5.00 



4.25 



2.50 



" 



Marsh Lake, Yukon Terr. 



13.10 



6.50 



6.00 



3.10 



" 



X. Platte City, Xeb. 



14.90 



S.00 



7.50 



4.00 



" 



" "' " 



12.50 



6.00 



5.50 



2.90 



" 



Platte River 



9.00 



5.25 



4.50 



2.50 



" 



a a 



