Eucrangonyx 389 



spine-row, 1^* Joint of palp longer than broad, 3^ fiilly as long as 2^, 

 curved. Otlier moutli-parts agreeing with those of Crangonyx flagellatus 

 (p. 371). Gnathopod 1 in cj', 5*^ Joint subtriangular, ^^ as wide as 6*-^, 

 6*'^ broadly ovate, -/g as wide as long, bind margin very short, palm oblique, 

 not sharply defined, fringed with about 15 notched spines. Gnathopod 2, 

 5*^ Joint as wide as 6*^, rather longer than in gnathopod 1, 6*'^ Joint also 

 a little longer and narrower. In Q gnathopod 1 has bind margin longer, 

 palm shorter, and gnathopod 2 is decidedly smaller than gnathopod 1. Peraeopod 3 

 about ^/g as long as peraeopod 5, peraeopod 4 intermediate in length, 2*^ 

 Joint in all narrowly oval, üropod 1 extending beyond uropod 2, and 2"^ 

 beyond 3^. üropods 1 and 2 stout, each with subequal rami, shorter than 

 peduncle. Uropod 3 short, outer ramus half as long as peduncle, inner 

 ramus rudimentary, unarmed, 7* or ^/^ as long as outer. Telson in d 

 smooth, cylindrical, apically rounded and tipped with spinules, normally 

 about as long as pleon Segments 1 — 3, sometimes half as long as the body. 

 In 9 it is only little longer than broad, extending to apex of uropod 3, 

 flattened, slightly emarginate, with 2 terminal Clusters of 4 or 5 spines. 

 Colourless. L. 9 — 10 mm. 



Illinois. Well at Normal, and in Springs. 



2. E. vejdovskyi Stebb. 1896 Crangonyx subterraneiis (err., non Bäte 1859!), 

 V^ejdovsky in: SB. Böhm. Ges., nr. 10 p. 12 t. 1 — 3 | 1899 Eucrangonyx vejdovskyi, T. 

 Stebbing in: Tr. Linn. Soc. London, ser. 2 v.7 p. 423. 



O . 8ide-plate 4 much deeper than those which follow, broad, emarginate, 

 lower margin crenulate. Pleon segments 1 — 3, postero-lateral corners rounded. 

 No trace of eyes, but variable orange-or lemon-coloured pigment-masses in 

 their place. Antenna 1, 1^* JQJut not as long as 2*^ and 3*^ combined, 3*^ 

 in tigure even longer than 2*^, flagellum somewhat longer than peduncle, 

 with 9 — 13 joints; accessory flagellum, P* Joint twice as long as 2^. Antenna 2 

 shorter, ultimate Joint of peduncle (in tigure) much shorter than penultimate, 

 flagellum 3 — 5-jointed. Lower lip, inner lobes (in figure) not very distinct, 

 mandibular processes unusually prolonged. Mandible, 2*^ Joint of palp broad, 

 considerably longer than 3<^. Maxiila 1, inner plate with 4 setae, outer with 6(7?) 

 spines. Maxilla 2, inner plate with setae near the inner margin. Maxillipeds, outer 

 plates not reaching the middle of palp's 2*^ Joint, palp's 4*^' Joint with a nail. 

 Gnathopod« 1 and 2. 5^^ Joint shorter than 6*^, distally nearly as wide, 

 6*^' rectangular, nearly twice as long as broad in gnathopod 1, and more than twice 

 as long as broad in gnathopod 2, palm convex, not very oblique, much shorter 

 than bind margin, finger with nail. Peraeopods 1 and 2 very slender, said to 

 be slightly longer than peraeopods 3 — 5, which have the 2^ Joint oval, with serrate 

 margins, the 4*^ rather long and distally somewhat wideued. üropod 1, peduncle 

 as long as the equal rami. üropod 2, peduncle shorter than the rami. üropod 3, 

 peduncle half as long as outer ramus, which carries 6 or 7 spines, inner 

 ramus rudimentary, flattened, shorter than peduncle. Telson almost Square, 

 apex with rounded emargination, and 5 or 6 spines on either side. Accessory 

 brauchiae on peraeon segments 5 — 7 latero-ventrally inserted somewhat 

 behind the basal Joint of the peraeopod, directly behind the primary branchiae. 

 L. 4 mm. 



Wells near Prague. 



'■i. E. packardii (S. I. Sm.) 1873 Crangonyx vitreus (err., non Stygobromus v. 

 E. D. Oope 1872 !), Packard in : Rep. Peabody Ac, v. 5 p. 95 | 1888 C. packardii, (S, I. Smith 

 in:) Packard in: Mem. Ac. Washington, u4l p. 35 t. 5 f. 5 — 11 | 1899 Eucrangonyx p., 

 T. Stebbing in: Tr. Linn. Soc. London, ser. 2 v.7 p. 423. 



