AMPHIPOD CRUSTACEA OF THE GENUS GAMMARUS 



67 



TABLE 3 

 Measurements of Gaiuuiarus pulcx (Linne) from Xorth India 



The numljer of the juints of the flagellum in the second antenna also fluctuates greatly, 

 from 11 to 18, sometimes as few as 7, 8, or 9. The presence of calceoli on this antenna of 

 the male was not detected in all of the present specimens. 



(8) Some other characters. The ecologically most interesting feature is the relative size 

 of the gill-lamallae in the specimens from different localities, particularly at different alti- 

 tudes. In the individuals froni the lower Kashmir localities the branchiae are relatively 

 smaller in size than in the specimens obtained from the higher localities. Several examples 

 of gills of the specimens of nearly same body length are shown for comparison in Plate VII. 

 Dodds and Hisaw (1924) demonstrated the comparable fact that in swift and well-oxygen- 

 ated waters the respiratory organs of some aejuatic insect larvae show a tendency toward 

 reduction. 



The bodies of the specimens from the Kashmir localities and the higher districts l)eyond 

 the Ladak Range have good deposits of lime and are rather hard and fragile, while those 

 from the localities south of the Ladak Range have relatively soft bodies with poor deposits 



