THE NATURAL HISTORY SURVEY. 283 



Among a lot of specimens from Calumet River, the indi- 

 vidual which is here figured (PI. 31, Fig. 3) was found. It is the 

 slenderest specimen of reflexa yet seen, the whorls (seven and 

 one-half) are just a trifle convex, the sutures somewhat im- 

 pressed, and the spire very attenuated. 



Length, 36.00; width, 9.50; aperture length, 14.00; width, 6.00 mill. 

 ii 3. Limna>a stagnalis* appressa Say, pi. xxxiv, fig. 1. 



Ltmncea appressa SAY, Journ. Phil. Acad., Vol. II, p. 168, 1821. 

 Limn&a speciosa ZIEGLER of ROSSMASSLER, Icon, und Siissw. Moll., 



pt. I, p. 96, pi. ii, fig. 50, 1835. 



Limnaa jugularis SAY, Nich. Encycl., Amer. ed., 1816. (Variety.) 

 Limncea stagnalis var. occidentalis HEMPHILL, The Nautilus, Vol. IV, 



p. 26, 1890. (Variety.) 



Limnaa stagnalis var. sanctamarice WALKER, 1. c., Vol. VI, p. 31, pi. i, 

 figs. 4, 5, 1892. (Variety.) 



Shell: Elongated (or oval), ventricose at the anterior end, 

 thin; color yellowish-horn to brownish-black; surface shining, 

 growth lines numerous, crowded, more or less elevated, crossed 

 by numerous fine, impressed spiral lines; apex smooth, brown- 

 ish horn color; whorls six and one-half, rapidly increasing, all 

 but the last two rather flat sided; last whorl very large, con- 

 siderably dilated and inflated; spire long, pointed, acute, occu- 

 pying about half the length of the entire shell (sometimes very 

 short); sutures distinct, sometimes impressed; aperture large, 

 broadly ovate, dilated, particularly at the upper part; peris- 

 tome thin, acute, in some specimens thickened by an internal 

 callus; lower part rounded; columella crossed in the middle by 

 a very heavy plait, which starts from the base of the aperture 

 and runs obliquely into the aperture of the shell about 10 mm. 

 from the junction of the peristome with the body whorl; there 

 is a spreading callus on the columella and labrum; which com- 

 pletely covers the umbilicus. 



Lgth., 48.00; width, 21.50; aperture Igth., 26.00; width, 14.00 mill. (8113.) 

 " 51.00; " 22.50; " " 26.50; " 15.00 " (8113.) 



" 33.00; " 16.75; " " 18.50; " 9.50 " (8113.) 



" 50.00; " 20.00; " " 26.00; " 12.00 " (8113.) 



" 62.50; " 25.50; " " 33.00; " 17.00 " (coll. Jensen.) 



" 57.00; " 24.00; " " 31.00; " 14.50 " (12315.) 



*It seems hardly necessary, or worth the time expended, to name the numerous varie- 

 ties of this species recognized by European writers, and yet it may be of some interest to 

 tabulate the names of some of these varieties as recorded in the Annales de la Societe Mala- 

 cologique de Belgique, Voll VII, 1872, p. 81, et seq. These are: sinistraa. Jtff. (reversed), 

 lutea, maxima, expansa. quadrangulata, alba, erosa, regularis, disiorta, aferta, btfluata, 

 costulata, all of Collin; minima, gibbosa, illaqueata, aquarii. arenaria, ftoditcta, all of J. 

 Colb.; rosea Gass., sitbfusca, major, pumila, turgida, all of Moq.-Jan., var. roseo-labiata 

 Wolf (Moq.), fragilis L. (Moq.), scalaris Broeck. This list simply shows to what extent 

 the system of varietal naming may be carried. 



