NATURAL SCIENCES OE PHILADELPHIA. 19 



Helix albolabris Say. 



alternata Say. 



arborea Say. 



chersina Say. Rarely seen. 



concava Say. 



electrina Gould. 



fallax Say. Small var. 



fuliginosa Griffith. Rare and solitary. 



bydrophila Ingalls. Very plenty and gregarious. 



indentata Say. Rarely seen. 



intertexta Binney. 



lineata Say. Not plenty. 



inornata Say. Rare. 



minuta Say. Very plenty in damp grounds. 



minuscula Binney. Only very recently observed, and quite rare. 



monodon Rackett. Our most common Helix. 



palliata Say. 



Sayii Binney. Very rare. 



striatella Anthony. 



thyroides Say. Rare. 

 Succinea obliqua Say. 



vermeta Say. (Is not avara.) 

 ovalis Gould. 

 Bulimus lubricus Brug. 

 Pupa pentodon Say. 

 contracta Say. 

 Vertigo ovata Say. 



Gouldii Bin. 

 Carychium exiguum Say. 



I have made some experiments for the purpose of ascertaining if various 

 species of Uniones would bear transplanting. The following species have been 

 placed in the Erie Canal, at various times, but no evidence has yet been had of 

 their multiplying : Unio radiatus from Schuyler's Lake. Unio campto- 

 don Say, from Ohio ; U. parvus Say, from Ohio ; U. undulatus Bar., 

 from Ohio ;U. cariosus Say, from Troy, N. Y.; An. i m p 1 i c a t a Say, from 

 Troy, N. Y. 



A variety of Lymnaea known as catascopium Say, abounds in the 

 Canal, and it is very usual for their eggs to be washed over the sides of an 

 aqueduct into a small creek, where they come to maturity, to be washed into 

 the river with the fall floods. One or two favorable seasons have enabled 

 me to ascertain that those which came to maturity have the form of 

 el o d e s. A small pool of stagnant water, formerly the bed of the Canal pre- 

 vious to its enlargement, is populated by thousands of Ly mnasa that for- 

 merly formed part of the Canal family. These vary in their forms in different 

 seasons ; some retain the form of catascopium, others diverge to emar- 

 g i n a t a, but a larger number are elodes. ThePaludinaof the Lakes I 

 regard as de ci s a, but they are probably not the same as the shells of the 

 Canal and River that have that name. 



Notes on the Nomenclature of North American Fishes. 



BY THEO. GILL. 



The following notes are selected from a large number on American and foreign 

 fishes in the possession of the author. Others upon North American fishes are 

 reserved until a more complete examination can be made ; it is hoped that the 

 following may, in the mean time, be of service to the student of American 

 Ichthyology. 



I860.] 



