mi PODS OF rilE ATLANTIC COAST— UK 'IfARDSOX. 



553 



ly 



tho emaro-ination; the sixth and seventh segments posteriorly ernar- 

 ginate, with prominent epimera. 



Terminal segment of the body al)out iis broad as long, witli a small 

 rounded lol)e in the middhM)f the posterior margin. The uropoda are 



somewhat longer than the terminal 

 segment, extremely slender and eylin- 

 drical in shape, with both branches 

 nearly equal in length, and longer than 

 the peduncle. 



The legs of the first pair are slender; 

 the dactylus is serrate along the iimcn- 

 margin, the propodus is narrow, oval 

 in shape, and unarmed. 



The color is reddish-brown mottled with white. All 

 the free margins of the body are fringed with hairs. 

 The lateral margins of the segments and the caudal 

 segment are armed with spines. The uropoda and the 

 legs are spinulose. 

 A large number of specimens were collected by Mr. William Pal- 

 mer and Mr. Paul Bartsch, at Washington Ditch, Dismal Swamp, 

 Virginia. 



fi/ju'.—Cnt No. 23910, U.S.N.M. 



Fk;. 28.— Leg of the 

 first pair. 



Fig. I'T.— 'i. Max 

 illiped; li.JI ax 



DIBLE. 



SI. CyECIDOTEA Packard. 



125. C^CIDOTEA STYGIA Packard. 



Csecidotea stygia Packard, Am. Naturalist, V, 1871, p. 752, figs. 132, 133. 

 Ciecidotea microcephala Cope, Am. Naturalist, V, 1872 p. 411, fig. 109. 



Ilaly'dat. — Graham's Spring, Lexington, Virginia; also Mammoth 

 Cave, Kentucky, and wells in Indiana. 



Familv XV. JANIRID^. 



ANALYTICAL KEY TO THE GENERA OF .TANIRIDiE. 



Head Avithout any true rostrum. First pair of antennse extremely small with 

 flagelluiii rudimentary. Second pair of antennpe of moderate length, without 

 any distinctly squamiform appendage. First pair of legs not jsrehensile. Uro- 

 poda extremely small, branches very short, nodiform 52. Jsera. 



' . Head with prominent rostral projection, obtuse in front or with a comparativeh'' 

 short rostral j^rojection. Firstpair of antennpp well developed, flagellum multi- 

 articulate. Second pair of antennje very much elongated with a well-marked 

 scale-like appendage outside of third joint. First pair of legs prehensile, 

 carpus large, subfusiform and edged inside with spines; propodus narrow, 

 linear, and very movably articulated to carpus, so as to admit of being bent 

 against it. Uropoda largely developed, with branches slightly unequal. 



/>. tiead with lateral parts produced to very prominent acute la]>pets. Segments 

 of thorax with lateral parts laciniate and produced. Caudal segment forming 

 on each side, at the end, a triangular expansion 53. lanthe. 



I/. Head with lateral parts not produced into lappets. Segments of thorax with 

 lateral parts not produced, not laciniate. Caudal segment muutled, not ex- 

 l^anded laterally 54. Janira. 



