AMPHIPODA AND ISOPODA FROM BARRINGTON TOPS. 



89 



first. Third, fourth and fifth (fig. 

 7) peraeopoda with the basal joint 

 moderately expanded, posterior 

 margin serrate. Terminal uropoda 

 (fig. 11) projecting beyond the 

 others, basal joint stout and short, 

 with several spines and long setae 

 at the extremity, outer ramus about 

 three times as long as peduncle, 

 with about five groups of spines and 

 slender setae; second joint very 

 short; inner ramus very small, tri- 

 angular, and bearing one small seta. 

 Telson (fig. 12) cleft to the base, 

 each lobe with extremity rounded 

 aud bearing on the outer and pos- 

 terior margins four or five long 

 slender setae, two or three other 



Fig. 7. Gammarus barrinq- 



tonensis, basal portion of Setae ariS1D S fr0m tlie U PP er Slir " 



fifth peraeopod. face. 



The description given above applies to the female. I have 

 only a few specimens and have not been able to work out 

 the sexual differences fully. 



Fig. 9. Gammarus barring tonensis, first uropod. 



Fig. 8. Gammarus 

 barring tonensis, 

 " accessory 

 branchia." 



Fig. 10. Gammarus barringtonensis, 

 second uropod. 



