248 THE CHICAGO ACADEMY OF SCIENCES. 
collection of several thousand specimens of parva-+-curta, sent for 
examination by Mr. T. Van Hyning of Des Moines, lowa, proves 
beyond a question that the two forms are the same species. The 
statement in the Nautilus (X XIX, p. 52, 1905) is erroneous, the speci- 
mens there considered parva being a totally distinct species. (See 
dalli, page 251.) Limnea tagewelliana, described from Pleistocene 
deposits of the Illinois River, is undoubtedly the same as parva. Speci- 
mens from Des Moines, identified as tazewelliana by Dr. Pilsbry, are 
the same as Lea’s parva in the Smithsonian collection, and the figure 
and description of tazewelliana agree perfectly with the Des Moines 
specimens. Wolf’s figure is probably too obese in the body whorl, 
however. The type of tazewelliana was thought to be in the Phila- 
delphia Academy, but a careful search failed to reveal it in the col- 
lection. The Wolf collection was presented to the high school at 
Canton, Illinois, but efforts to secure information concerning Wolf’s 
types were fruitless. 
Galba parva sterkii (Baker). Plate X XIX, figures 15-22. 
Lymnea sterkii BAKER, Nautilus, XIX, p. 51, Sept. 1905; Bull. Ill. State Lab. 
N. H., VII, p. 104, 1906 —StTerx1, Proc. Ohio State Acad. Sci., IV, p. 382, 1907.— 
DanieEts, Nautilus, XXII, p. 121, 1909. 
Lymnea parva sterkii BAKER, Bull. Ill. State Lab. N. H., VIII, p. 492, pl. 25, 
fig. 21, 1910. 
SHELL: Small, elongated, turreted, rather thin; color light yellow- 
ish horn, darker in some specimens; surface dull to shining, marked 
by distinct, crowded, raised growth lines generally without spiral lines ; 
nucleus small, rounded, about the same size and shape as that of parva; 
whorls 514-6, very convex, somewhat shouldered, especially the last; 
spire narrow, rather acute, turreted, generally longer than the aperture, 
sutures very deeply impressed; aperture ovate, much expanded an- 
teriorly; outer lip sharp, thin; inner lip forming a very broad, flatly 
concave expansion reflected over the umbilicus, which it emargins; 
there is a thin wash of callus on the parietal wall; umbilical chink 
narrow but deep; axis thickened, straight. 
Length. Breadth. Aperturelength. Breadth. 
7.75 3.50 3.50 1.75 mill. Type 
85 4.00 3.25 200) : 
8.00 3.50 3.50 200m a: i 
7.00 3.50 3.25 200) s 
10.00 4.75 4.75 2500 Canton, Ill. 
9.00 4.50 4.60 ao) 3 g 
Types: The Chicago Academy of Sciences, five specimens, Nos. 
23155, 23156; cotypes, Philadelphia Academy of Sciences, No. 90177; 
coll. Sterki. 
