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o4+ THE CHICAGO ACADEMY OF SCIENCES. 
moides in general form and may be distinguished by the presence of 
the heavy impressed spiral lines. 
Half-grown specimens with short spire have been identified as 
umbilicata by many students and have been so reported from various 
parts of the country. A study of Adams’ specimen of wmbilicata has 
shown, however, that these authors were in error, Adams’ specimens 
being quite a different shell. (See wmbilicata.) Caperata was at first 
thought to range under stagnicola, but its wide, flat inner lip, and the 
shape of the prostate, places it rather in typical Galba, with cubensis 
and truncatula. 
Say’s type of caperata is not in existence. A somewhat worn 
specimen with long, scalar spire is preserved in the collection of the 
Academy of Natural Sciences of Philadelphia (No. 58824), marked 
as follows, in MS.: “Lymnea caperata Say. Illinois. N. H. Dis- 
seminator, Vol. 2, p. 230. Ex. Auct.” This specimen differs but 
slightly from Binney’s figure 87, being a trifle more scalariform. It 
agrees well with Haldeman’s figure 3 on plate 11 of his monograph. 
Smithsoniana Lea is an absolute synonym of caperata, differing only 
in size, in its shorter spire and in its darker color. Lea’s types in the 
Sinithsonian Institution do not differ from caperata as found in Indiana 
and Illinois. Specimens recently collected in the south branch of the 
Platte River near Fort Morgan by H. W. Clatworthy (Ex. Mr. Junius 
Henderson) are identical with Lea’s types. Ferrissi Baker is simply 
a markedly scalariform example of caperata. (Plate XXIX, figure 3.) 
Caperata has been kept in an aquarium in the writer’s study for 
many months at a time. While in confinement many specimens ate 
holes in each others’ shells for the lime needed to build their own shells. 
An egg mass of this species was laid March 16, 1897. It contained 
45 eggs, distinctly nucleated, and in a jelly-like mass measuring 11 
by 2 mill. On March 18 a second egg mass was laid and on the 19th 
three more masses. On the 22nd three individuals were seen in coitu, 
each one endeavoring to play the active part. Of the five egg masses 
laid each contained the following number of eggs: 42, 42, 35, 45, 28. 
The eggs were spherical in shape and very distinctly nucleated. 
Galba holbollii ( (Beck) Moller). Plate XXIX, figure 4. 
Limnea (Limnophysa) holbollii Becx, Index, p. 111, 1838. (Nude name.) 
Limnea holbollii Morcu, Moll. Gron., p. 76, 1857—Brnney, Check List, p. 
12, 1860; L. & F-W. Sh. N. A., II, p. 59, fig. 91, 1865——Morcu, Amer. Journ. 
Sci., IV, p. 36, pl. 4, fig. 8, 1868—Tryon, Con.. Hald. Mon., p. 101 (75), pl. 17, 
fig. 11, 1872.—Sows., Conch. Icon., XVIII, sp. 22, pl. 4, fig. 22, 1872.—STEEN- 
struP, Mal. Blatt., n. s. I, p. 17, 1879-——West., Vega Exp., IV, pp. 167, 169, 170, 
1885. 
