72 Trans. Acad. Sci. of St. Louis. 



are very plentiful. Limestone is abundant in various places 

 and of course tends to produce a snail fauna of large size. 

 The Erie Canal is one of the best collecting localities in the 

 State, and more species can be found in it than in any other 

 one body of water in the region. In the spring, when it is 

 drained, the collector may don his rubber boots and literally 

 " wade in " after these interesting creatures. At such a time 

 a large number of species of Unionidae may be obtained, for 

 the canal is the metropolis of this group in the western part 

 of the State. 



The writer is under obligations to the following persons 

 for assistance of various kinds : — 



Messrs. Harry S. Hall and Herbert S. Harris for valuable 

 aid in collecting ; Mr. John Walton for information regarding 

 Monroe County moUusks ; Dr. Howard N. Lyon for a collec- 

 tion of shells from Cayuga County ; and Prof. R. Ellsworth 

 Call, Mr. C. W. Johnson and Prof. Henry A. Pilsbry for 

 assistance in determining various species. 



The list of stations at which collections were made is as 

 follows: — 



Station 1. Pinnacle Hill, Southeast Rochester. An esker 

 from 100 to 200 feet above the plain upon which Rochester is 

 built. The high hill called the Pinnacle is very steep, having 

 a slope of from 10 to 30 degrees. The summit is well wooded, 

 the trees extending well down the sides in a ravine, which 

 separates the main hill from the little spur known locally as 

 *' round the world." Dead logs and leaves are very abundant, 

 and while the soil is rather sandy in some spots, yet where 

 the vegetation has had a chance to decay, there has been 

 formed a rich loam, in which the moUusks love to bury 

 themselves. Oak and maple trees predominate. July 8. 

 Thermometer 90° in shade, collections made in the morning. 

 Weather fine.* 



Station 2. Residence of Mr. John Hall, 16 Boardman 



* The data for the Pinnacle and Cobb's Hills are taken from Mr. Warren 

 Upham's paper, Eskers near Rochester, N. Y., in Proc. Roch. Acad. Sci. 

 2: 181-200. 1892. 



