8 Trans. Acad. Sci. of St. Louis. 



Physa crandalli Baker. 



Physa rhomboidea Crandal 1901 (non Mecha Hayden, 1856). 



Long Lake. 



One semi-fossil specimen. It is with some hesitancy that 

 I identify this specimen with rhomboidea, but no other way 

 seems permissible, as it corresponds with both the figures and 

 description of the species in the Nautilus. (XV, p. 44, plate 

 2, figs. 6, 7, 1901.) The species is normally southern in 

 distribution, the types being from Sedalia, Missouri. The 

 specimen agrees very well with an undoubted specimen from 

 Knox County, Indiana, collected by Mr. L. E. Daniels. The 

 specimen in question has the same peculiar columella, umbi- 

 licus, impressed sutures and somewhat gibbous whorls. It is 

 a little wider than the figures of rhomboidea in the Nautilus 

 and the spire is a trifle more depressed. The measurements 

 for this individual are as follows : 



Length 14.50; width 8.50; aperture length 9.00; width 5.00 mill. 



Physa anatina Lea. 



Isaacson's farm. 



This species is most frequently confounded with gyrina. 

 The difference is principally in the shape of the aperture, 

 which in gyrina is distinctly loop-shaped while in anatina it is 

 triangularly elongate ovate. The spire in anatina is also more 

 pointed. A few deformed specimens of anatina had the 

 aperture somewhat loop-shaped, as in gyrina. A typical 

 specimen of anatina measures as follows: 



Length 15.00; width 9.00; aperture length 10.00; width 4.00 mill. 



Physa Integra Haldeman. 



Long Lake ; Ox Bow ; Thunder Bay River. 



The specimens of integra are of good size and are typical 

 in form. 



Physa walkeri Crandall. 



PI. L, flgp. 5, 6 (Nautilus XV, p. 57, pi. 2, fig. 5. 1901.) 



Typical specimens of this quite distinct species were col- 

 lected on Isaacson's farm. They vary in the elevation and 



