202 THE CHICAGO ACADEMY OF SCIENCES. 
strongly impressed ; aperture ovate or roundly-ovate, generally evenly 
rounded at the lower extremity and somewhat angled above; outer lip 
thin, sharp; inner lip reflected to form a rather broad, flat, excavated 
projection over the umbilicus, there being a moderately open chink; 
parietal callus very thin; the inner lip is rolled over and appressed 
rather closely to the columellar region ; axis forming a series of smooth, 
hour-glass-shaped pillars. 
Length. Breadth. Aperture length. Breadth. 
10.50 5.00 5.00 2.50 mill. European spec. 
11.50 6.00 5.75 2.000 6 " 
7.50 4.25 3.50 2100 ve i 
7.50 4.00 3.50 Uae ee i. 4 
6.00 3.50 3.00 125 Olen * P 
7.00 4.50 3.50 2:00) + ¢ 
Types: Location not ascertained. 
Type Locauity: Not known. 
AnimMAL: Not examined. 
Jaw, Raputa and GEniTaLiA: Not examined. 
Rance: (Figure 15) Europe, northern Asia and portions of 
Alaska and Yukon Territory. 
The presence of true truncatula in America, except in portions of 
Alaska, Yukon and the Aleutian Islands, is seriously to be questioned. 
The majority of the specimens examined have been referable to Galba 
parva Lea. Further investigation, however, may discover it in other 
portions of northwestern North America. 
RECORDS: 
ALASKA: Ponds near Yukutat Bay (Kincaid) ; Ladyginsk, Behring Island 
(Stejneger); Kadiak (Jeffreys). 
Yuxon, BritisH AmMerIcA: Lake Marsh (Randolph). 
GEOLOGICAL RANGE: Pleistocene. There are no American rec- 
ords. 
Ecotocy: Inhabits marshes, ditches, muddy streams, ete. 
Remarks: Truncatula may be distinguished by its turreted 
whorls rather narrow shell and ovate aperture. It resembles humilis 
and parva, but these species are quite distinct, having a differently 
shaped spire and inner lip. 
It is closely allied to cubensis, having somewhat the same form 
of inner lip, but may be distinguished by its narrower shell, more at- 
tenuate spire and less rotund body whorl. The inner lip is not as 
roundly folded in truncatula as in cubensis, being rather a little exca- 
vated in the middle ; the umbilical chink is also smaller in truncatula. 
