117 



in Silver Lake township, Shawnee Co. (Quiniard); western Barber Co. 

 ! (Yagin); Oswego (Dr. Newloi). 



This species is now reported for the first time from Kansas, and appears 

 to occur not uncommonly. It is readily distinguished from the very 

 abundant S^lnrrimn striatinum, Lam., by the absence of striation and 

 uTCMU'r fragility. It has nowhere occurred abundantly. 



sjkh.,-1 iiim Ktaiiiiueum, Conrad. Elm Creek, Barber Co. ( Cragin) ; 

 Kansas River, at Topeka (Quintard). 



This very beautiful shell is of rather rare occurrence, and does not ap- 

 pear to be generally distributed geographically. Its globose or obese ap- 

 pearance, dark epidermis with fine striae, light straw-colored ventral mar- 

 gins, and smooth beaks, will serve to distinguish it from other forms 

 reported hitherto. 



Genus PISIDIUM. 



pisidium atxiitum, Haldeman. Wabaunsee Co. ( Miss Lillian A. Bald- 

 win). 



These minute bivalves --the smallest genus represented in American 

 waters, are now first reported from Kansas. They are easily distinguished 

 from young Sphseria by the position of the beaks, which are in Sphserium, 

 nearly or quite central, while in Pisidium they are prominently inclined 

 anteriorly, and are entirely forward of a line drawn from the hinge to the 

 ventral margin. At least one other species of this genus may be expected 

 to yet occur in the collections which are to be carefully made the coming 

 summer. 



It may not be out of place to suggest, at this point, that these minute 

 shells, and others of the minute gasteropods, Amnicola, Somatogyrm, and 

 the like, should be sought by scraping the muddy banks of streams or the 

 surface of muddy submerged bars. The mud, and whatever material it 

 may contain, should be carefully sifted, using a fine flour sieve, and shak- 

 ing it gently to and fro under the water. The shells may be assorted at 

 the leisure of the collector. In this manner a thorough examination may 

 be made, and, when a favorable locality is found, large quantities may be 

 taken in a comparatively brief time. These small forms should always be 

 thrown into alcohol for a day or two and then dried. They may be cleaned 

 by shaking in a test-tube with sand and water. 



GASTEROPODA. 



RISSOID^E. 

 Genus AMNICOLA. 



Amnicoia < in< innatioiisis. Anthony. Vesser Creek, Shawnee Co. (Quin- 

 tard); a small creek near Wabaunsee (Miss Lillian A. Baldwin). 



Two species have been contributed by Miss Baldwin, both from the 

 same locality. The second of these species was reported under the name 

 of Amnicoia limosa, Say, in the second of these contributions. It is a 

 somewhat globose and short form, differing ve*-y greatly in this particular 

 from the species here catalogued for the first time. A. cincinnatiensis is 

 the largest species of the genus, and has probably the widest range. Speci- 



