118 



mens are before the writer from Albany, New York, San Antonio, Texas, 

 Salt Lake City, Utah, (quaternary fossils), Des Moines, Iowa, and over 

 thirty intermediate localities. The species is a remarkably constant one. 

 and the easiest to determine of any of the group. 



Amiiicola porata, Say. Cross Creek, Jackson Co. (Quintard), a small 

 creek near Wabaunsee (Miss Baldwin). 



This form and the preceding are nearly co-equal in geographic distribu- 

 tion. It is quite readily distinguished from the preceding by its propor- 

 tionately larger body-whorl, shorter spire, and less number of whorlf. It 

 appears to be more abundant than Amnicola cincinnatiensls. 



LIMJSLEID^E. 

 Genus LIMNOPHYSA. 



Limnophysa bulimoides. Lea. Marshy draws, Belle Meade, Ford Co. 

 (Cragin). 



The specimens submitted, twenty-two in all, are enough to settle any 

 doubt which may arise as to the validity of the determination. In appear- 

 ance, size, and all characteristic markings, they agree almost perfectly with 

 specimens of Lea's L. bulimoides, received from Oregon, and also with 

 specimens personally collected in northwestern Nevada in 1883. Binney, 

 in Smithsonian Miscellaneous Collections, No. 143, page 56, figures a form 

 from Grindstone Creek which not only resembles L. bulimoides but is also 

 our shell. If found away from the water or draws, it is quite likely that 

 many collectors would imagine they had happened upon a new Bulimus, 

 so closely does it resemble that genus. In the reference to Mr. Binney 's 

 figure only the first and last the two smaller of the four figures are 

 indicated as probably new, and as being examples of this form. There is 

 no tendency whatever to malleation, a feature rarely wanting in L. catas- 

 copium. There is no other known American Limnophysa with wi.ich it 

 is at all comparable. The shell is perfectly smooth, with bright, shining 

 epidermis. 



Limnophysa caperata, Say. Elm Creek, Barber Co. (Cragin). 



This species was originally described from Indiana. Its range is very 

 great, from Massachusetts and Rhode Island to Hudson's Bay, and west 

 to Utah. In some portions of Iowa and Illinois it is very abundant and 

 attains a great degree of perfection. 



rimiioph.vsa desidiosa, Say. Silver Lake, Shawnee Co. (Quintard). 



Mr. Quintard has submitted a number of very fine examples of this 

 species from the locality named. It is usually an abundant shell, and 

 ranges throughout the whole of the United States, and northwest into the 

 British Possessions. It is, in habit, quite similar to L. hvmilis, Say. be- 

 fore reported. 



Genus ANCYLTTS. 



Ancylus ri vularis. Say. On inner surface of valves of dead Anodonta 

 grandis, in tributary to Soldier Creek, Silver Lake Township, Shawnee 

 Co. (Quiutard); Cedar Creek, Mt. Ida (Snow), discovered in same situa- 

 tion. 



One specimen of this form was found, accidentally, while examining the 



