370 Paracrangonyx, Apocrangonyx, Crangonyx 



postero-lateral corners subquadrate. Eyes represented by 2 or 3 imperfect 

 lenses without pigment. Antenna 1, 1^* Joint longer than 2*^, 2*^ once and 

 a half as long as 3^, flagellum rather longer than peduncle, 13-jointed, accessory 

 flagellum with 2 joints, 2^ minute. Antenna 2, ultimate and penultimate 

 joints of peduncle equal, flagellum shorter than either, 5-jointed. Gnathopod 1, 

 5*^ Joint Short, cup-shaped, 6^^ twice as long, palm about as long as bind margin, 

 defined by spines, finger closely fitting it. Gnathopod 2 siniilar, but 5**^ Joint 

 much longer and 6*^ slightly shorter, with shorter and better detined 

 palm. Peraeopods 1 — 5, finger short. Pleopods well armed with coupling-spines, 

 the slender Single ramus without cleft spines, such as are commonly found 

 on 1^* Joint of inner ramus. Pleopod 1, ramus with 11 joints, pleopod 2 

 with 6, pleopod 3 with 3. üropod 1, peduncle longer than the falciform 

 rami, outer ramus rather the shorter. üropod 2, peduncle little longer than 

 the subequal rami. üropod 3, peduncle short, outer ramus thrice as long, 

 with small 2^ Joint, inner ramus rudimentary. Telson oblong ovate, with 

 spinule at each corner of the broad apex. Colour white, semi-transparent. 

 L. about 8 mm. 



New Zealand (from pump at Eyreton, from Leeston, and from wells at Canterbury). 



4. Gen. Apocrangonyx Stebb. 



1899 Apocrangonyx (Sp. typ.: A. lucifugus), T. Stebbing in: Tr. Linn. Soc. London, 

 ser. 2 u 7 p. 422. 



Eyes wanting. Antenna 1 longer than antenna 2, accessory flagellum 

 small. Gnathopod 2 stouter than gnathopod 1. Peraeopods stout. üropod 3 

 rudimentary, without rami. Telson entire. 



1 species. 



1. A. lucifugus (0. P. Hay) 1882 Crangonyx Z., 0. P. Hay in: Amer. Natural., 

 V. 16 p. 144 I 1893 C. l, A. Della Valle in: F. Fl. Neapel, u20 p.682 | 1894 C. l, Chilton 

 in: Tr. Linn. Soc. London, ser. 2 v.ß p. 219 | 1899 Apocrangonyx l., T. Stebbing in: 

 Tr. Linn. Soc. London, ser. 2 v. 7 p. 422, 



ä. Pleon Segment 3, postero-lateral corners subquadrate. Antenna 1 

 scarcely half as long as body, 2^ Joint '^g as long as 1^*, 3*^ Joint % as long as 2<i, 

 flagellum 14-jointed, accessory flagellum 2-jointed. Antenna 2, half as long as 

 antenna 1, ultimate and penultimate joints of peduncle long, together longer 

 than flagellum, which is about 5-jointed. Gnathopod 1, 6*^ Joint quadrate, palm 

 smooth-edged, fringed with spines. Gnathopod 2, 6*^ Joint ovate, edge of palm 

 uneven. Peraeopods 4 and 5 the longest, subequal. üropod 1, rami equal, 

 shorter than peduncle. üropod 2, outer ramus nearly as long as peduncle, inner 

 nearly twice as long as outer. üropod 3 consisting of a Single Joint which is 

 rather longer than the telson, broadly ovate, -/g as broad as long, with 2 short 

 spines at apex. Telson a little longer than wide, narrowing a little to the truncate 

 apex, which has 2 stout spines at each corner. Colour pale. L. reaching 

 6 mm. — In 9 gnathopod 2 has the p'almar margin less oblique. 



Illinois (well in Abingdon). 



5. Gen. Crangonyx Bäte 



1859 Crangonyx (Sp. un. : C. subterraneus), Bäte in: P. Dublin Univ. zool. bot. 

 Ass., v.l p.237 I 1890 C, Wrzeäniowski in: Z. wiss. Zool., v.50 p. 634, 697 | 1893 C, 

 A. Della Valle in: F. Fl. Neapel, u20 p.681 | 1894 C, Chilton in: Tr. Linn. Soc. London, 

 ser. 2 v.G p.218 | 1896 C, Vejdovsky in: SB. Böhm. Ges., nr.lO p.5 | 1872 Stygobromm 

 (Sp. un.: S. vitreus), E. D. Cope in: Amer. Natural., v.6 p. 422 | 1875 Stygodromus, 

 E. V. Martens in: Zool. Hec, v. 10 p. 189. 



