A NEW SUBTERRANEAN FRESHWATER 

 AMPHIPOD 



VINNIE R. STOUT 

 POMONA COLLEGE, CLAREMONT, CALIFORNIA 



The specimens examined were collected near Auburn, Alabama, in October, 

 1898, by Prof. C. F. Baker, from the bottom of a well through which ran a living 

 stream. 



Crangonyx alabamensis n sp. 



(Figures 187 and 188) 



Length 5 to 7 mm. Entirely blind. AntcniiiP a little longer than half the body; 

 flagellum with about twenty-two joints and much longer than the peduncle; 

 accessory flagellum very small, two-jointed. Second antennas more than half as 

 long as first antennae, peduncle longer than flagellum, which is Q-l 1-jointed. 

 Second gnathopod longer that first gnathopod and differing from it as follows: 

 basal joint one-third longer than first gnathopod and lacking the long hairs on 

 posterior margin; other hairs longer; carpus bearing a finely plumose palp-like 

 epiphysis of three or four branches ; ))alm more oblique and armed in both pairs 

 with a row of stout, obtuse, notched s])ines. Periopod five was not present on any 

 of tlie specimens but probably very closely resembles periopod four. Uropod one 

 with rami subequal, two-thirds as long as peduncle; second uropod with rami 

 unequal, outer a little more than half as long as inner ; third uropod about half as 

 long as telson, ramus small and tipped with two or three spines. Telson about 

 two-thirds as broad as long, and tapering but little to the entire, slightly rounded 

 apex, which is armed with eight or nine slender spines. 



This species is closest to Crangonyx tenuis (S. I. Smith), taken in Connecticut, 

 but differs from it in that the side-plates are not so shallow; first antennffi much 

 longer than second antenna?, and with more joints than in C. tenuis; first gnathopod 

 stouter, but second gnathopod more oblique; second uropod extending farther 

 than either first or third; telson not arcuate. 



*Miss Stout and Miss Stafford, advanced students in the Department of Biology, who 

 fiave been making speoial studies of certain Amphipoda and Isopoda, have now worked 

 out thoroiiplily these two interesting blind species taken many years ago in r well in 

 Southeastern Alabama. The locality is far from any previous locality recorded for either 

 of these genera. Only by accident, while fishing for large slugs on the walls of a well, 

 for use in the zoological laboratory, was running water discovered in the bottom of the 

 well. A trap composed of old pieces of ragged wood was effectual in raising many 

 specimens to the surface. — Ed. 



