4:64 THE CHICAGO ACADEMY OF SCIENCES. 



Morelet, which occurs in Siam and Cochin China. A mixing of labels 

 may have led Lamarck to refer it to "the fresh waters of Virginia." 

 No specimens of American or European species have been seen at all 

 comparable with it; it is of the type of shell occurring abundantly in 

 Indo-China. 



Limnea vitrea Haldeman. 



Limnea vitrea HALD V Mon. Lim. pt. 4, cover p. 3, 1841; p. 47, pi. 13, figs. 

 14, 15, 1842. DzKAY, Zool. N. Y., p. 75, 1843. 



Limncea vitrea BINNEY, Check List, p. 12, 1860; L. & F.-W. Sh. N. A., 

 II, p. 60, fig. 93, 1865. SOWB., Conch. Icon., XVIII, Lim., pi. 14, fig. 94, 1872 

 (poor figure). TRYON, Con. Hald. Mon., p. 106 (80), 1872. 



Limnophysa vitrea TRYON, Amer. Journ. Conch., I, p. 255, 1865. 



Limnaus vitreus KUSTER, Conch. Cab., p. 50, taf. 11, figs. 11, 12, 13, 14, 1862. 



"Shell ovate, extremely thin and delicate; surafce smooth and 

 polished; lines of growth very fine; aperture ample; the labium pre- 

 sents a well marked fold, and is not appressed anteriorly ; spire short, 



"Geographical Distribution: Ohio? Missouri? 



"Foreign analogue. L. tennis, Bronn. 



"This species presents us with a shell which is probably thinner in 

 texture than that of any other we have. For the specimens figured I 

 am indebted to Mr. G. B. Emerson, president of the Boston Society 

 of Natural History." (Haldeman.) 



Haldeman's types of this species are in the Philadelphia Academy 

 (No. 59872, two specimens). Figure 15 of Haldeman's original plate 

 seems to be a form of columella. Figure 14 is a different form and 

 may have been an introduced Indian species. Figure 15 measures as 

 follows : 



Length, 12.00; breadth, 6.00; aperture length, 6.75; breadth, 3.50 

 mill. 



The species is a composite one, judging from the types. It might 

 possibly be included in columella in part. 



Lymnaea Sp. 



Limnaa desidiosa STERKI, An. Rep. Geol. Surv. Texas, III, p. 263, 1901. 



"About ten small specimens, for the most part damaged, of a 

 slender form, distinctly umbilicated, with well rounded, somewhat 

 shouldered whorls and deeply impressed suture, can hardly be ranged 

 under any other species, although, even when mature, they certainly 

 were of small size." 



In the absence of the specimens, which have not been obtainable 

 by the writer, it is impossible to ascertain which one of the southern 

 forms of Lymnaea this may have been. 



