ARTICLE VI 



REPORT ON AMPHIPOD CRUSTACEA OF THE GENUS GAMMARUS 



By Masuzo Ueno 



Otsu Hydrobiological Station, Otsu, Japan 

 (Received February 21, 1934) 



The gammarids here discussed were collected by Mr. G. Evelyn Hutchinson during the 

 Yale North India Expedition in Kashmir, Ladak and the Tibetan borders of North India. 

 The collection, though consisting of only one common species, Gammanis pulex (Linne), is 

 highly interesting, as it enables us to ascertain the distribution of gammarids at such unusu- 

 ally high altitudes as 5000 meters and over, altitudes which are believed to be greater than 

 those of any previously known localities for this species. I wish herewith to express my best 

 thanks to Mr. G. E. Hutchinson for kindly permitting me to undertake this work and also 

 for giving me useful information on many matters. I am greatly indebted to Prof. Kenzo 

 Kikuchi of Tokyo, for the use of his copy of Sars' monograph and to Dr. A. B. Martynov, 

 Leningrad, for supplying me with Chevreux's paper. 



1. Localities at which Gammarids Were Collected 



The collection consisted of twenty-three bottles of specimens in spirit containing over 

 150 individuals.' As indicated in Table 1, gammarids, though common both in Kashmir 

 and in the most elevated regions, are quite absent in the intermediate localities lying between 

 1600-3600 meters, a phennmencm that will be discussed in the last chapter of the present 

 paper. 



2. Description of the Species 



Family : Gammaridae 



Genus: Gammarus Fabricius 



Gauunanis piilcx (Linne, 1758) 



In all characters of specific importance, all the specimens from Kashmir and Ladak agree 

 rather well with the descriptions and figures given by G. O. Sars (1895, pp. 503-505) and 

 Stebbing (1906, p. 474) for the typical form of Gaiuuianis pulex (Linne). There are, how- 

 ever, several important features to be noted peculiar to the North Indian specimens, especi- 

 ally those from Kashmir and the western part of Indian Tibet, north of the Ladak Range, 

 when compared with material discussed by several authors (Chevreux 1908, Martynov 1930, 

 Schiiferna 1922, Spandl 1923 and 1924, Tattersall 1914 and 1922) who have studied the 

 variation of certain characters of this species from different localities. 



' Since the material was sent to Dr. Ueno a few more specimens have been t'omid in miscellaneous collec- 

 tions from several localities. These additional localities are recorded in a note appended to the present paper. 

 —G. E. H. 



Mem. Conn. Ac.^D., Vol. X, Art. VI. September, 1934. 



