218 THE CHICAGO ACADEMY OF SCIENCES. 
part, and is joined at its summit by the vas deferens; the 
retractor muscle is inserted into the penis sac a short distance 
from its summit; the genital bladder is large and globular; its 
duct is nearly as long as the oviduct, and is narrow; the vagina 
is moderately long and muscular; the cloaca is short.* 
Distribution: World-wide. 
KEY TO SPECIES OF SUCCINEA. 
A. Spire short, aperture occupying the greater part of the shell. 
a. Aperture witle, oblique 1 ie. tia ch ask tna: sak eo wane ovals 
b..' Aperture Jong) narrow, steaight.¢ 55 fcc. «rie aku cen ee on retusa 
B. Spire long, aperture occupying a little over half of the shell....avara 
84. Succinea ovalis Say, pl. xxx, figs. 22, 23. 
Succinea ovalis Say, Journ. Phil. Acad., Vol. I, p. 15, 1817. 
Succinea obligua SAY, Long's Expedition, Vol. II, p. 260, pl. xv, fig. 7, 
1824, 
Succinea totteniana LEA, Proc. Amer. Phil. Soc., Vol. II, p. 32, 1841. 
_ (Variety.) 
Shell: Large (for the genus), thin, fragile, ovately-oblique, 
pellucid; surface shining, marked by distinct lines of- growth, 
sometimes raised in ridges; color yellowish green or amber, 
sometimes very light, at others very dark; whorls three, rapidly 
enlarging, the last being more than twice the length of the 
others combined, very oblique and much expanded; spire 
short, blunt; sutures well impressed; aperture obliquely ovate, 
very large, occupying more than two-thirds of the entire shell; 
columella thin, narrow, its margin slightly glazed with testa- 
ceous matter; peristome thin, blunted, the terminations con- 
nected by a thin callus; the shell is covered with a very fine 
periostracum. I 
Length, 22.00; diam., 12.50; aper. length, 15.50; diam., 9.50 mill. (10451.) 
+ BGO Senet Leh O AME oc ot s 16.00; 9.75“ (10451.) 
“ 2000s 9 So AB Soret a 14.00; “ 9.00 “ (10449.) 
s Li aie ee LOO ot? Ly 12.50; “ 9.00 “ (10442.) 
Animal: With a wide foot, truncate before, rounded be- 
hind; color in general yellowish or saffron, with seven distinct 
black lines on the anterior part, one in the center of the head, 
one on the dorsal surface of each eye-peduncle, one on each 
side of the neck and one on each side of the foot; the mantle 
is grayish in color; tentacles white, small, inconspicuous; eye- 
peduncles rather short, thick, blunt, the eyes placed as usual 
at the tips; there is a deep furrow on each side, commencing 
* Man. Amer. Land Shells, p. 343. The author is also indebted to Mr. Binney for much 
or most of the information used under the generic description of Succimea. 
to et hs 
