FRESH- WA TER AMPHIPODA— WECKEL. 



41 



the palm. Second g-nathopods in the female much smaller than in the 

 male; carpus elont^ated, as broad as the propodus; propodus narrow, 

 twice as long as broad; lateral margins parallel; palm straight, trans- 

 verse, without a lamellar edge and devoid of a median tooth. 



Coxal plates of the last three pensopods with the posterior margin 

 serrate. 



The infero-posterior angles of the second and tiiird abdominal seg- 

 ments are slightl\" produced, forming- less than a right angle. The 

 fourth, tifth, and sixth segments are slight!}^ angulated dorsally, each 



Fig. 8.— Gammarus fasciatus. gn. 1 $, gn. 2 ?, first and second gnathopods of a female, 



OTHER FIGURES FRO.M A MALE; mil.. MANDIBLE, AND Vlxp., MAXILLIPED, DRAWN TO A LARGER 

 SCALE THAN THE OTHER PARTS; ah. d., DORSAL SIDE OF THE TERMINAL PART OP THE ABDOMEN. 



bearing' three fascicles of well-developed spines, the median one of 

 which on the fourth and fifth segments is raised on a distinct 

 protuberance. 



First uropods exceeding the second pair in length and projecting- 

 backward slightly beyond the peduncle of the terminal pair; outer 

 ramus of the terminal pair composed of two segments, the first seg- 

 ment elongated, furnished on both margins with many long plumose 

 hairs and on the outer margin with several small obtuse spines; the 

 distal segment very short, styliform, and furnished at the tip with 

 several hairs, but having no hairs on the lateral margins; inner ramus 



