238 REPORT OF THE 



x 89. Paludina obesa, Leives. 



90. " ponderosa, Say. 



91. " rufa, Bald. 



92. Amnicola grana, Gould. 



93. " lapidaria, Say. 



94. " pallida, Hold. 



CLASS ACEPHALA. 



SIPHONIDA. 



FAMILY CYCLADIDAE. 



95. Spheerium occidentale, Prime. 



96. " partumeia, Say. 



97. " ' solidulura, Prime. 



*2. H. alternata. This seems to be the most widely distributed mollusk In the State, being 

 found everywhere as far north as Lake Superior. 



*14. H. hydrophyla. I am indebted for this species to Mr 0. A. Currier, of Grand Rapids, 

 who has made extensive collections in the Grand River Valley, and has a valuable 

 cabinet of native shells to which he has given me free access, thus materially facilitat- 

 ing my labors in this department. 



*29. H. pulchella. Mr. Albert D. White, who has rendered me valuable assistance in collect- 

 ing Zoological specimens, has furnished a suite of the Helicidae from Ann Arbor, con- 

 taining this species. It is found there in abundance. 



x52. P. deflectus. This species is added to the catalogue on the authority of Mr. Currier. 



*57. P. truncatus, nobis. Shell sub-orbicular, color light chestnut; the right side deeply 

 umbilicated, the concavity bordered by an obtuse carina ; the volutions seen from this 

 side are scarcely more than two ; left side truncated, presenting a flat surface extend, 

 ing across all the whorls, the suture being marked by a minute raised line, which 

 likewise extends around the edge of the truncation; the space between the volutions 

 of this raised line, as well as the entire body of the shell, is beautifully marked with 

 delicate longitudinal lines, which are crossed by the minute, raised, transverse lines of 

 growth; the longitudinal lines are scarcely distinguishable without the aid of a micro- 

 scope; whorls on left side four or five; aperture ovate, widest on the right side, which 

 extends beyond the general plane of that side of the shell;, the lip on the left side is 

 straight for a short distance from the body whorl, and in a line with the truncated 

 plane, at the outer edge of which it forms an angle, marked on the inner surface by a 

 slight groove, corresponding to the raised line separating the whorls on the outside; 

 lip thin, slightly thickened by a bluish-white callus, bordered on the inner edge by a 

 purplish band; the longitudinal lines, as well as the transverse lines of growth, ara 

 distinctly seen within the aperture. Measurements, .6— .35. Hab. Saginaw Bay. In 

 a few specimens the growth of the whorls has not been in the same plane, leaving a 

 slightly projecting turreted spire on the left side. 



*85. V. humeralis. Grand River. Mr. Currier's cabinet. 



»89. P. obesa. Grand River Valley. Cabinet of Mr. Currier. 



