238 REPORT OF THE 



x 89. Paludina obesa, Lewes. 



90. " ponderosa, Say. 



91. " rufa, Bald. 



92. Amnicola grana, Gould. 



93. " lapidaria, Say. 



94. " pallida, Hold. 



CLASS ACEPHALA. 

 SIPHONIDA. 



FAMILY CYCLADIDAE. 



95. Sphserium occidentale, Prime. 



96. " partumeia, Say. 

 91. " solidulum, Prime. 



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

 found everywhere as far north as Like 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 fumi-bcl a suite of the llelicidae from Ann Arbor, con- 

 taining this species. IL is fouufl tup; e in abundance. 



*52. P. deflectus. This species is addcil to the catalogue on the authority of Mr. Currier. 



s57. P. truncatus, nobis. Shell sub-Oibicular, color light chestnut; the right side deeply 

 umbilJcaled, the concavity bordered by an obtuse carina ; the volutionsseen from this 

 side are scarcely more than two ; left wM trnncated, 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, ?s beautifully marked with 

 delicate longitudinal hues, which arc crossed by the miuute, raised, transverse lines of 

 growth; the lougii -td'oal lines are scarcely distinguishable without the aid of a micro- 

 scope; whorls on left sidn four or five; apei lure ovate, widest od the right side, which 

 extends beyond thu geuerai pbue «f 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, are 

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

 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. 



