32 



PROCEEDINGS OF THE NA TIONAL MUSEUM. 



VOL. XXXII. 



EUCRANGONYX GRACILIS (Smith). 



Crangonyx gracilis Smith, Am. Jour. Sci., 3d ser., II, 1871, p. 45.'3; Prelim. Report 

 on Dredgings in Lake Superior, 1871, p. 1022; Rep. U. S. Fish Com., 

 1872-73, (1874) p. 654.— Fokbrs, Bull. 111. State Lab. Nat. Hist., No. 1, 1876, 

 p. 6.— O. P. Hay, Am. Nat., XVI, 1882, p. 241.— W. P. Hay, Proc. U. S. 

 Nat. Mus., XXV, 1902, p. 429. 



Eucrangonyx gracilis Stebbing, Tran.'^. Linn. Soc. London, 2d ser., VII, 1899, 

 p. 423. 



Eyes small, elong-ated. First aiit(Mina' slig-ht!}' nioie than half as 

 long- as the body; peduncle with the tirst segment shorter than the 

 second, which is about twice as long- as the third; flagelhim twice as 

 long' as the pedimcle and consisting' of al)Out thirty segments; second- 

 ary flag'ellum about equal in length to the first segment of the primar}' 



Fig. 3. — Eucrangonyx gracilis, Ann Akbor, Michigan, vu-p., maxilliped; for other inscrip- 

 tions TO THIS AND SUCCEEDING FIGURES SEE FIG. 2. gn. '2'$, SECOND GNATHOPOD OF A SMALL 



female; g7i. 2" 9, second gnathopod of a large female. Maxilliped drawn to a larger 



SCALE than the OTHER PARTS. 



one, composed of two segments, the terminal one slender and very 

 short. Second antennte half as long as the first pair; ultimate and 

 penultimate segments of the peduncle nearlj^ equal; tiagelhnn some- 

 what shorter than the peduncle and composed of eight to ten segments. 

 Carpus of the first gnathopods in the male about as broad as long; 

 the posterior margin produced but slightly and furnished with long- 

 plumose hairs; propodus almost ([uadi-ate in outline, a little longer 

 than broad; palm convex, slightly ol>lique, and armed on each side 

 with from ten to fifteen notched spines, which are e((uidistant from 

 each other except at the posterior angle, where about five are crowded 

 together; each spine is furnished with a hair a short distance from the 

 tip; the posterior margin slightly concave, with a few long hairs; 



