OF CONCHOLOGY. 245 



With a view to derive useful information from experiments in 

 the colonization of species of mollusca, it may be well to remark 

 that, in continuation of experiments heretofore attempted, in 

 June, 1868, a considerable number of species of mollusca were 

 transported from the Mohawk River to the outlet of Schuyler's 

 Lake, in Otsego County (about 18 miles south from Mohawk). 

 The species which were deposited there are as follows : Melaniho 

 Integra, DeKay. M. rufa, Hald. Trypanosoma [Mel.) subulare 

 Lea. Goniobasis Niagarensis, Lea. Somatogyrus isogo?ms, 

 Say. Amnicola Cincinnatiensis, Anth., and Bytliinella (?) 

 obtusa, Lea. 



If in future years any of these species should be detected in 

 any portions of the Susquehanna River, it may be presumed 

 they are derived from the stock colonized in the outlet of Schuy- 

 ler's Lake. Experiments made, having in view the establish- 

 ment of Vivipara contectoides, Binney, (Pal. vivipara, Say,) in the 

 Mohawk River and Erie Canal, do not seem to have been successful. 

 It is, however, thought desirable to continue these experiments, 

 as the results of them may possibly be such as, in some, instances, 

 to throw light on the causes which influence the production of 

 varieties. Contributions of living molluscs for this purpose are 

 much desired by the writer. 



The hill lands along the valley of the Mohawk produce a fine 

 variety of a species of Succinea, apparently S. Totteniana, Lea. 

 In August, 1866, a considerable number of specimens of this 

 species were taken from neglected apple trees in a pasture. 

 These specimens were found adhering to the under sides of the 

 horizontal limbs, and on the trunks of the trees, 6 or 8 feet 

 from the ground. In the spring of the same year many speci- 

 mens of S. obliqua, Say, were found on trees in an alder swamp, 

 at from 4 to 18 feet from the ground. A few years earlier many 

 specimens of this species were found in August, on the rank an- 

 nual vegetation along the shaded banks of the river, 6 or 8 feet 

 from the ground. In no other instances have decided arboreal 

 habits been observed in the mollusca of this region. 



Among the Unionidm may be remarked the gradually in- 

 creasing numbers of Unio Tappanianus, Lea, a small species 

 formerly very seldom seen in the Mohawk River.* 



In the Erie Canal, Anodonta Lewisii, Lea, formerly very 

 abundant, is now quite scarce, probably on account of chemical 

 contamination from the gas works and armory at Ilion, a mile 

 and a half west from Mohawk. 



* Several hundred specimens of very young Unio Tappanianus less 

 than half an inch in length were deposited in the Erie Canal in June, 

 1868, with a view to their establishment in a new station. 



