Pleistocene Shells from Milivaukee, Wis, 



175 



ARTICLE XVIII.— NOTES ON A COLLECTION OF 

 PLEISTOCENE SHELLS FROM MILWAUKEE, 

 WISCONSIN. 



By Frank C. Baker, Chicago.* 



Mr. A. W. Slocum has recently collected a few pleistocene 

 mollusks near Milwaukee, Wis., and has placed them in my 

 hands for determination. The collection seems of enough 

 interest to warrant a few notes. 



Part of the specimens were found in a marl bed and the 

 rest in a clay and peat bed ; four feet below the latter the bones 

 of an elephant were found. Nine species were found in the 

 marl bed, and three "in the clay and peat beds. Mr. Slocum 

 reports that he found the same fauna in two places, six or 

 seven miles apart. The specimens are beautifully preserved, 

 some individuals having a highly polished surface. Speci- 

 mens were extremely numerous in the marl bed, but were 

 not so numerous in the clay and peat beds. The following 

 species were collected : 



PELECYPODA. 



1. Sph^rium simile Say. Peat and clay bed. Not com- 

 mon. The umbones are placed nearer to the anterior end 

 than in the forms now found living in this region, and the 

 beaks are not so prominent. Of six valves examined five 

 were right and but one a left valve. The collection contained 

 one young specimen, seven mm. long, and very heavily 

 striated. 



2. Sph^rium rhomboideum Say. Peat and clay bed. 

 Typical and rare. 



3. Pisidium compressum Prince. Peat and clay bed. 

 Typical and with well preserved epidermis. The valves are 

 attached to each other, in most cases. 



*A set of these fossils has been received from Professor Baker as a donation to the 

 Cincinnati Society of Natural History. They are entered in the accession cata- 

 logue of the Museum under Nos. 12206 to T22T7. — J. L. 



(Jour. Cin. Soc. Nat. Hist. Vol. XIX, No. 5. ) 1 Printed January 4, 1900. 



