LYMNAZ:IDZ OF NORTH AMERICA. 263 
elongate ovate, somewhat narrowed above; peristome thin; inner lip 
narrow, reflexed over the umbilical region, rolled over and appressed 
at the point of contact with the parietal wall, but standing more erect 
at the lower part; umbilical chink small, narrow but distinct; axis as 
in Galba humilis. 
Length. Breadth. Aperture length. Breadth. 
8.50 4.25 4.75 2.75 mill. Say’s type 
8.50 4.50 4.00 2.00 “ jamesii 
To 3.25 4.50 235 “ ‘(Chicago 
7.00 3.50 4.50 PO) 7 
8.50 5.00 5.00 Oy, Ae Oakland Co., Mich. 
7.00 4.00 4.00 200) os i 
9.50 4.90 5.00 3.00 “ Macomb Co., Mich. 
8.25 4.50 4.50 PLD a : MY 
12.00 6.00 5.30 3.00 “ Alpena, Mich. 
10.25 5.00 5.00 Pras s ze 
10.50 5.75 5.75 3.00 “ Hamilton Co., Ohio. 
Tyres: Modicella, Academy of Natural Sciences, Philadelphia, 
two specimens, No. 58790; jamesii, one specimen, Smithsonian Insti- 
tution, No. 29106. 
Type Locatity: Owego, Tioga County, New York, on the Sus- 
quehanna River,! for modicella; ponds near Cincinnati, Ohio, for 
jamesu. . 
Anima: Similar externally to obrussa; color light brownish or 
blackish, lighter on the foot. 
Jaw: Similar to that of obrussa. 
Raputa: Formula : 3184148414114 51% (25-1-25) ; lateral teeth 
tricuspid; the seventh tooth transitional ; marginals beginning abruptly 
on the eighth tooth. The shape of the teeth do not differ from those 
of obrussa and its varieties. ° 

GENITALIA: Similar to those of obrussa. 
Rance (Figure 25): Eastern Quebec, Nova Scotia and New 
Jersey west to Vancouver Island; Manitoba south to southern Cali- 
fornia, Arizona, Texas and Alabama. 
Modicella is one of the most widely distributed of the smaller 
Lymnzas, its range embracing practically the whole of the United 
States, north and west of the Alleghany Mountains. It is, therefore, 
found in the Boreal, Transition, and Upper and Lower Austral life 
zones. It seems to be absent from the gulf strip of the Austro-riparian 
division of the Lower Austral life zone, as well as from the Atlantic 
Coast strip of the Lower Austral, its place here being taken by typical 
1In Binney’s monograph this locality is spelled Oswego. 
