~2 
Su) 
oo 
LYMNZZIDZ OF NORTH AMERICA. 
The above figures show that the organs are somewhat variable in 
form. Some of the variation, however, is due to the contracted con- 
dition of the alcoholic specimens. In one individual, the receptaculum 
seminis was rounded instead of quadrangular (pl. XII, fig. E), but 
in all other specimens it was as in figure A. 
In the immature form (called crystalensis) the retractors of the 
male organs vary considerably. (Pl. XV, fig. A.) One specimen (1) 
had the penis retractor attached to the penis-sac retractor; a second 
pemis-sac retractor was present, its insertion in the columellar muscle 
being some distance from that of the posterior retractor. The posterior 
protractors also varied in position and number in one specimen (2), 
having their insertions in the columellar muscle, very close together. 
Three measurements of the immature individuals are given below: 
Penis Penis-sac Prost. Ret. sem. 
Penis. Penis-sac. _ ret. ret. Vas. def. duct. duct. Shell. 
3.50 4.00 2.00 1.50 11.00 5.00 4.00 21.00 
3.00 4.00 2.00 a Ls P(5) 13.00 5.00 4.50 21.00 
3.00 4.00 2.00 eas 16.00 6.00 6.50 27.00 
An egg capsule, deposited in the pond of the zoological laboratory 
of the University of Chicago, measured 34.50 by 1.60 mill. and con- 
tained 130 eggs. 
. The chief characteristic of the genitalia of reflevra is the form of 
the receptaculum seminis; otherwise they do not differ markedly from 
those of palustris. 
RANGE (Figure 37): Eastern Quebec (65°) to Nebraska (100°) ; 
Manitoba (50°) south to southern Illinois and southern Kansas (37°). 
Reflexa is characteristic of the humid divisions of the Transition 
and Upper Austral life zones, extending northward into the Boreal 
(Canadian) life zone. It is not authentically known west of the 100th 
meridian, nor does it enter the Lower Austral, the 37th parallel mark- 
ing its southern limit. Compared with the regional map, refleva is 
seen to range through the Canadian and a large part of the Upper 
Mississippian regions, embracing the drainage areas of the Great Lakes, 
of the St. Lawrence River and of the upper portions of the Mississippi 
River. It reaches its greatest development in the prairie region of 
the central west. References to this species from localities west of — 
the 100th meridian have all proved to be Galba proxima and var. 
rowelli, which the immature reflexa greatly resembles. Binney (p. 41, 
Cat. Nos. 3523 and 8734) has confused the species with rowelli. Tay- 
lor’s reference of this species to Red Deer, Alberta, was probably 
founded on narrow forms of palustris. 
