NO. ir.07. FRESH- WA TER AMRllIPODA— WECKEL. 4 V> 



Length, 10 mm. 



Collected 1)}' Dr. C. H. Eig-enmaiui among the roots of a tree, 

 Modesta Cave, near Cana.s, Cuba. 

 Ti/pe.— Cat. No. 3268i», U.S.N.M. 



Genus CRANGONYX Bate. 



KEY To Sl'ECIES. 



A. Telson nearlyas broad as loiij^, with a slight eiuargiuat ion (Ustally; sec-oiid uropods 



with rami equal < '. /it reus, ]>. 49. 



A A. Telson entire, two-tliirds as broad as long; rami of second uropods unequal, the 

 outer ramus about half as long as the inner ,.<\ tennis, p. 50. 



CRANGONYX VITREUS (Cope). 



Styyubroiiiitx vitreus Cope, Amer. Nat., VI, 1872, }>. 422; ord and 4th Annual 



Repts. of Geol. Survey of Indiana, 1872, p. 181. 

 Crangonyx vitreus Packard, 5th Annual Rept. Peabody Academy of Science, 



Salem, 1873, p. 95.— Smith, Rept. U. S. Fish Com., 1872-73 (1874), p. 656; 



Amer. Jour. Sci., 3rd series, IX, 1875, p. 476. 



Blind. First antenna' more than halt" as long- as the t)od\'; the 

 three segments of the peduncle nearly equal in length; Hagellum 

 composed of about fifteen segments; secondary flagellum reaching 

 beyond the first segment of the primary one, consisting of two seg- 

 ments. Second antennte slightly less than half as long as the tirst 

 pair; peduncle extending I)eyond that of the tirst pair with the two 

 distal segments elongated and nearly equal; flagellum very short, 

 scarcely exceeding the distal segment of the peduncle in length and 

 composed of six segments. 



Propodus of the first gnathopods in the male slightly longer than 

 broad; lateral margins convex, the posterior margin furnished with a 

 few long hairs arranged in four or five fascicles; palm oblique, con- 

 vex, armed with four or tive groups of long hairs and nine or ten 

 notched spines, one of which at the posterior angle is nmch longer 

 than the other; dactyl stout. In the second gnathopods the propodus 

 is more elongated and more narrowed distally than in the first pair; 

 palm ver}^ oblique, convex, armed as in the first pair l)ut bearing a 

 few more spines. 



Both margins of the coxal plates of the last three pairs of perao- 

 pods are serrate and armed with small spines. 



First and second uropods extending beyond the telson; the third 

 pair projecting onl}' about half way to the tip of the telson; peduncle 

 about as broad as long; the single ramus very small, about one-third as 

 long as the peduncle, slightl}- longer than broad, and furnished distally 

 with two short hairs. Telson nearly as broad as long, a very slight 

 triangular emargination at the broad distal end, on either side of 

 which are four or five spines. 

 Proc. N. M. vol. xxxii — 07 4 



