1881.] 



NATURAL SCIENCES OF PHILADELPHIA. 



101 



Near Salt Lake, Utah T. 

 Utah Lake, U. T. 



Carthage, Ohio. 

 Cumbeiland Co., Tennessee. 



Cumberland Co., Tennessee. 



Tuolumne Meadows, Tuolumne Co., Cal. 



Indian River, Texas. 



Bexar County, Texas. 



Miami, Florida. 



Lake Simcoe, Canada. 



Near Portland, Oregon. 



Lake Simcoe, Canada. 

 Traskii, Clear Lake, Lake Co. Cal. 



" Oregon, Mus. Stearns. 

 Cp. Russian River, near Ukiah, Cal. 



King's River, Cal. 



Mountain Lake, near San Francisco, Cal. 



Santa Cruz, Cal. 



Los Angeles, Cal, 



Nicaragua. 



East Tennessee. 



Erie Canal, N. Y. 



McHenry County, Ills, 



Portland, Oregon. 



Lake Simcoe, Canada. 



Clear Lakes of Indian River, Florida. 



Orono, Maine. 



Henry County, Ills. 



Salinas River, Cal. 



Great Britain, many localities. 



The note marks above refer to the following parties from whom 

 the material examined was received : * Prof. A. G. Wetherbj' ; 

 t C. D. Voj ; t Henry Hemphill ; ft -^- ^'- Crawford ; § Dr. 

 Edward Palmer; %% the late Thomas Bridges; || 0. Button ; ^ the 

 late W. W. Walpole, Esq., from all of whom I have received most 

 generous assistance. 



As to the validity of the species, or determinations as above, it 

 is not necessarj' to discuss the matter in this paper, as it is not 

 pertinent to the objective point, but as may naturally be supposed 

 b}' any one who has had occasion to examine into the literature 

 relating to the group, and to make a critical comparison of mate- 



