240 Wisconsin Academy of Sciences, Arts and Letters. 
Genus Galba Schrank. 
41. Galba Jiumilis modieella (Say). 
Station XX 3 . Common just above the water line on 
the muddy flats bordering the Wisconsin River. 
42. Galba obrussa (Say). 
Station II 2 . This species was seen only on debris above 
the water on the shore of a sheltered bay. 
43. Galba lanceata (Gould). 
Stations II 2 , IV 2 , V, IX, XI, XIII 1 , XIV 2 , XV. This 
species normally lives only in large swampy bays protected 
from rough water. It is most abundant in quiet bodies of 
water where there is little* wave action, where it lives on 
logs, on the stems of Typa or on floating vegetation. Though 
quoted as a synonym of both reflexa and exilis, this species 
is unquestionably recognizable as a species ; it is one of the 
most abundant species in Tomahawk Lake. Xot in Chad¬ 
wick’s list. 
44. Galba emarginata wisconsinensis (Baker). 
Stations II 1 , III, IV 1 , VI, VII, VIII. This recently 
distinguished race of emarginata is characteristic of the ex¬ 
posed, wave-beaten shores of the large lake. It lives on the 
sandy or pebbly shores, in water from a few inches to sev¬ 
eral feet in depth. By wading along the sandy beach 
thousands may be collected in water but a few inches in 
depth. The habitats in this lake are all on exposed points 
or in curved bays where the shore receives the full force 
of the waves. Xo specimens were found in sheltered places, 
where the water was at all stagnant. The individuals 
were irregularly scattered over the surface, crawling over 
the sand where a distinct tract was left, or lying half 
buried in the sand. Two different color varieties of the 
animal were observed, one almost black and the other yel¬ 
lowish or even orange. 
Emarginata wisconsinensis is by far the most abundant 
shell in Tomahawk Lake, where in many places it forms 
windrows of dead shells on the shore after a northwesterly 
