THE NAUTILUS. \ 



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Goniobasis louisvillensis Lea. 



Gouiobasis informis Lea. 



Euryccelon leaii Tryon. 



Campeloma decamjni W. G. Binn. 



Somatogyrus currierianus Lea. 



Unio depygis Con. 



Two new species were added to the fauna of Michigan from bis 

 collection, viz. : Succinea decampii Tryon and Vertigo morsei Sterki. 

 The types of Limncea desidiosa var. decampii Streng, recently de- 

 scribed in THE NAUTILUS, were also found by him. 



In 1881, under the auspices of the Kent Scientific Institute, Dr. 

 DeCamp published an elaborate "Catalogue of the Shell-Bearing 

 Mollusca of Michigan." This, which is his only publication in 

 conchology, contains a list of 221 species and 9 varieties, and was 

 the most complete list of the State fauna published up to that time. 

 Eliminating synonyms and doubtful forms, it gives a total of 185 

 species as now recognized as against 149 species cited in Currier's 

 catalogue of 1868. It also is of particular value as containing de- 

 scriptions and figures of three species named but never formally de- 

 scribed by Currier, viz.: Limncea contrada, Physa parkeri and Ano- 

 donta houghtonensis. He was an enthusiast in his scientific work, 

 and his time and collection were always at the service of his fellow 

 collectors. 



Through his generosity the first set of his Michigan shells, upon 

 which his catalogue was based, is a cherished part of the writer's 

 collection, and the remainder of his shells have been deposited in the 

 Kent Scientific Institute, where they " will be kept to benefit and 

 instruct those who come after him." 



A DAY ON THE CHICAGO DRAINAGE CANAL. 



BY FRANK C. BAKER. 



July 30th, the Chicago Academy of Sciences spent its annual 

 field day on that wonderful engineering triumph, the Chicago Drain- 

 age Canal, and conchological results of the excursion may be of 

 some interest to the readers of the NAUTILUS. 



The day was all that could have been desired, the sun being more 

 or less obscured by clouds, which made collecting more comfortable 



