[Reprinted from SCIENCE, N. 8., Vol. LII1., No. 

 1576, Pages 460-462, May 13, 



NOTES ON THE OCCURRENCE OF GAMMERUS 

 LIMNAEUS SMITH IN A SALINE HABITAT 



THE capacities of various organisms for 

 withstanding relatively wide ranges of environ 

 mental conditions has received considerable 

 attention at the hands of physiologists and 

 students of animal behavior, and is a problem 

 which must ultimately be considered in 

 greater detail by ecologists, students of geo 

 graphic distribution and organic evolution. 



The purpose of this note is merely to call 

 attention to the occurrence of Gammerus 

 limnaeus Smith, 1 normally a fresh water 2 



1 We are indebted to Mr. Waldo L. Schmitt, as 

 sociate curator of marine invertebrates in the U. S. 

 National Museum, for the determination of the 

 species. The specimens are in the National Mu 

 seum. 



2 The key to the taxonomic and distributional 

 literature is furnished by Weckel s paper on the 

 fresh water Amphiopoda of North America (Proc. 

 U. 8. Nat. Mus., 32: 42-44, 1907), and individual 

 citations need not be given here. The species was 

 first dredged in Lake Superior. It has been taken 

 near Long s Peak, Colorado, at an elevation of 

 9,000 feet; from a cool spring, Fire Hole Basin; 

 from Shoshone Falls, Idaho; Flathead Lake, Mon 

 tana; and from the Yellowstone National Park. 

 It is reported from Fort Wingate, N. M., and from 

 the Wasatch Mountains and Salt Lake City, Utah. 

 It is impossible to determine from the records 

 whether all the localities were fresh water habitats, 

 but that it is typically a fresh water form can ad 

 mit of no possible doubt. It has been taken from 

 the stomachs of trout from brooks near Marquette, 

 Mich. 



