I ^^ 



The Nautilus. 



Vol. v. APRIL, 1892. No. 12. 



NOTES ON THE COLONIZATION OF FRESH-WATER SHELLS. 



BY WM. B. MARSHALL, N. Y. STATK MUSEUM, ALBANY, N. Y. 



In the American Journal of Conchology, vol. iv, 1868, j). 245, Dr. 

 James Lewis said : 



" With a view to derive useful information for experiments in the 

 colonization of species of moll usca, 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: Melantho Integra DeKav, M. 

 rufa Hald., Trypanostoma {Mel), subulare Lea, Goniohasis niagar- 

 ensis Lea, Somatogyrus isogo7uis Say, Aimiicola cinciunatieiisis Anth^ 

 and Bythinella (f) 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 stock colonized in the outlet of Schuyler's Lake. 

 Experiments made, having in view the establishment of Vivipara 

 contedoides 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. Contribu- 

 tions of living molluscs for this purpose are much desired b}' the 

 writer." 



(133) 



