THE NATURAL HISTORY SURVEY. 223 
85a. Succinea retusa magister Pilsbry. 
Succinea retusa var. magister PILSBRY, The Nautilus, Vol. XI, p. 143, 
1898, 
Succinea retusa magister PILSBRY, The Nautilus, Vol. XII, p. 108, 1899. 
Shell: Differing from redusa in being generally larger and 
in the less developed spire and larger aperture. 
Length, 19.00; width, 9.50; aperture length, 14.00; width, 7.00 mill. 
Animal: Similar to type. 
Faw and Radula: As in retusa. 
Distribution: Northern Mississippi Valley. 
Geological distribution: Pleistocene; Loess. 
Habitat: Same as type. 
Remarks: The variety does not seem to be as common as 
the type, although it is equally as widely distributed. 
86. Succinea ayara Say, pl. xxx, fig. 25. 
Succinea avara SAY, Long’s Exped., Vol. II, p. 260, pl. xv, fig. 6, 1822, 
Succinea vermeta SAY, New Harm. Diss., Vol. II, p.280, 1829. (Variety. 
Succinea wardiana LEA, Proc. Amer. Phil. Soc., Vol. II, p. 31, 1841. 
Succinea alba CKLL, The Nautilus, Vol. VII, p. 48, 1898. (Albino.) 
Succinea compacta CKLL, 1. c., p. 44, 1898. 
Succinea major WW. G. BINNEY, l. c., p. 44, 1893. (Variety.) 
Shell: Elongate-ovate, thin and fragile, shining; surface 
covered with minute lines of growth with here and there a line 
raised into an elevated ridge, which are more pronounced on 
the last whorl; color straw to greenish-horn, sometimes rosy; 
whorls three, rapidly increasing, rounded, the last whorl a trifle 
more than half the length of the whole shell; spire rather long, 
acutely conic; sutures deeply impressed; aperture roundly 
ovate, last whorl not much expanded, straight or slightly 
oblique; peristome sharp, simple; columella simple, almost 
straight; when young, the shell is frequently slightly hirsute. 
Length, 11.75; diam., 7.00; aperture length, 7.00; diam., 4.50 mill. (8462).) 
s P00» 46.00; a “4 6.50; “ 400 “ (10489.) 
Animal: Dirty white or yellowish-white in color, darker 
on head, neck and eye-peduncles; head distinct; eye-peduncles 
blunt, conical, of medium length, eyes black, situated as usual; 
foot long and narrow, somewhat flesh-colored, 8.00 mill. long 
and 1.50 mill. wide. In some specimens the body is almost 
transparent. The heart is situated one-sixteenth of an inch 
from the middle of the columella, to the left, and the pulsations 
number one hundred and thirty and are quite regular. 
Faw: Very strongly arched, the ends much attenuated 
and bent downwards; convex margin with two strong swellings 
