444 Elasmopus 



fiinged aud tipped witli short spines. Colour pellucid, ligbtly banded witli 

 crimson. L. 10 mm. 



Mediterranean (Italy); North- Atlantic (New Jersey, Long Island Sound, Yine- 

 yard Sound)? 



6. E. delaplata Stebb. 1888 E. d., T. Stebbing in: Kep. Voy. Challenger, i'.2^ 

 p. 1025 t. 99 I 1893 E. rapax (part.)?, A. Della Valle in: F. Fl. Neapel, v.20 p. 736. 



Body smooth. Head as in E. subcarinatus (p. 441). Side-plate 1 obtusely 

 much outdrawn, 2^ and 3^ navrowing downward, 4*^ excavate bebind, deeper 

 than b^^. Pleon segment 3, postero-lateral corners subacute, a little outdrawn, 

 their bind margin ratber strougly serrate. Eyes small, oval, uear margin 

 of lateral lobes of bead, wbite in spirit. Antenna 1 elougate, 1^* Joint stouter 

 and longer tban 2*^, 3*^ at least -/.^ as long as 2^, flagellum longer tban peduncle, 

 35-joiuted, accessory flagellum witb 3 long joints and a sbort one. Antenna 2 much 

 sborter, ultimate Joint of peduncle ratber sborter tban penultimate, flagellum 

 16-joiuted. Mandible, 3*^ Joint of palp elongate, ialcate, witb -long fringe 

 of spinules. Maxilla 1, inner plate witb 1 seta and 3 or 4 setules, outer 

 plate witb 7 spines, Maxilla 2, inner plate not fringed on inner margin. 

 Gnatbopods 1 and 2 nearly as in E. subcarinatus, but in gnatbopod 2 palm witb an 

 irregulär tootbed eminence uear fluger-binge, tbe strougly beut fiuger toucbing- 

 tbis but leaving a gap between its inner margin and tbe siuuously slopiug" 

 remainder of tbe palm, and closing down between 2 small processes on 

 inner surface of tbe 6*^ Joint. Peraeopods 1 and 2 slender. Peraeopods 3 — 5 

 moderately robust, but less stout than in most species, 2^ Joint oblong oval. 

 Uropod 1 reacbing beyond uropod 2, uropod 3 a little beyond uropod 1. 

 üropod 3, rami broad, lanceolate, tbe euds a little obtuse, not truncate, 

 outer ramus ratber longer tban inner. Telson ratber longer tban broad, 

 oval, cleft nearly to base, lobes only apically debiscent, eacb witb spine aud 

 cilium in notch of outer margin a little above tbe apex. L. 18 mm. 



South-Atlantic (Monte Video). Depth 1130 m. 



7. E. rapax A.Costa ISö'iiE.r., A.Costa in: ßend.Soc. Borbon., n. ser. «.2 p. 175 { 

 1889 E.r. (part.?), A.M.Norman in: Ann. nat. Hist., ser. 6 u 4 p. 124 t.ll f. 1—8 (?f. 3) | 

 1894 E. r., G. O. Sars, Crust. Norway, v.l p. 521 1. 183 | 1857 Gammarus brevicauclatus 

 (non H. Milne Edwards 1840!), Bäte in: Ann. nat. Bist., ser. 2 u 19 p.l45 I 1862 Mega- 

 moera brevicaudata, Bäte (& Westwood), ßrit. sess. Crust., v. 1 p. 409 f. | 1862 M. b., Bäte, 

 Cat. Amphip. Brit. Mus., p. 228 t. 40 f. 2 | ? 1866 Maerab., Cam. Heller in: Denk. Ak. 

 Wien, V. 26u p. 42 t. 3 f. 27, 28 | 1871 Elasmopus latipes, A. Boeck in: Forh. Selsk. 

 Christian., 1870 p. 212 | 1876 E. l, A. Boeck, Skand. Arkt. Amphip., v.2 p. 393 t. 24 

 f. 1 I 1887 E. l, Chevreux in: Bull. Soc. zool. France, v.l2 p.229 f. 3 | 1893 E. affinis-j- 

 E. rapax, A. Della Valle in: F. Fl. Neapel, ».20 p. 734 t. 1 f. 9, t. 22 f. 1 — 15; p. 736 

 t. 22 f. 16—22. 



Body robust, sraootb. Head, lateral lobes broadly rounded, obtuse 

 accessory lobe below tbe principal. Side-plate 1 angularly but very sligbtly 

 produced in front, 4*^ excavate bebind, mucb deeper tban o^^. Pleon segment 3, 

 postero-lateral corners subquadrate, tbeir bind margin indented. Eyes rounded 

 oval, ratber large, very dark (Sars), rosy, pale witb wbite spots (Della Valle). 

 Antenna 1, 1^* and 2^ joints subequal in lengtb, 3*^ more tban half as long as 2*^, 

 flagellum ratber sborter tban peduncle, many-jointed, accessory flagellum 

 2-jointed. Antenna 2 mucb sborter, ultimate and penultimate joints of peduncle 

 subequal, togetber longer tban flagellum. Gnatbopod 1, 6*** Joint longer tban 

 5*^, oval quadrangular, palm nearly trausverse, well-detined. Gnatbopod 2 

 in ö, o*^ Joint sbort, broad, cup-shaped, 6*^ powerful, somewhat phiform, 



