418 Cheirocralus 



just below tbem. Side-plate 2 tbe deepest, A^^ scarcely emarginate, little 

 or not at all deeper than 5*^. Eyes small, round. Autenua 1 much the 

 shorter, accessoiy flagellum very small. 2- or 3-joiuted. Upper lip rouuded. 

 Lower lip, inner lobes moderately distinct. Mandible normal, 1*** Joint of 

 palp not very sbort, 3^ shorter than 2^. Maxilia 1, inner plate witb numerous 

 setae. Maxilia 2, inner plate fringed along inner margin. Maxillipeds, palp 

 rather sbort and slender. Moutb-pai-ts in otber respects normal. Gnatbopods 1 

 and 2 in 9 ratber feeble, subequal, 6*^ Joint narrow, witbout palm. Gnatbopod 1 

 in ö as in 9 , gnatbopod 2 in c5" powerful, strongly subcbelate. Peraeopods 1 

 and 2 sligbt. Peraeopods 3 — 5 successively longer, 2*^ Joint uarrowly oblong. 

 Uropod 3 long, rami narrowly lanceolate, subequal. Telson deeply cloft, 

 lobes divergent, apically spinöse. 



4 species. 



Synopsis of species: 



) Peraeopod 5, 4tli — Otli joints narrow — 2. 

 \ Peraeoi^od 5, 4th — Hth joints broad — 3. 



Gnatbopod 2 in (5, palm not marginal, but formed 



by teeth on inner surtace of 6tli Joint .... 1. C. sundevallii . . p. 418 

 Gnatbopod 2 in cJ, palm marginal, concave ... 2. C. intermedius . p. 419 



I Gnatbopod 2 in (5, palm not marginal, but formed 



3 { on inner surface of 6th Joint 3. C. robustus . . . p. 419 



l Gnatbopod 2 in cJ, palm marginal, distal, dentate 4. C. assimilis . . . ji. 419 



1. C. sundevallii (H. Rathke) 1843 Gammarus s., H. Katbke in: N. Acta 

 Ac. Leop., i;.20i p. 65 t. 3 f. 2 | 1888 Cheirocratns s., T. Stebbing in: Rep. Voy. (>hallenger, 

 u29 p.204| 1893 C. s., A. Della Valle in: F. FL Neapel, u 20 p. 690 t. 20 f. 3, 4, 24, 

 25,27,30 I 1876 C. simdevalli, A. Boeck. Skand. Arkt. Ampbip., v.2 p. 396 t. 24 f. 2 

 (but not 2k) | 1889 C. s., A.M.Norman in: Ann. nat. flist., ser. 6 v.4 p. 130 t. 11 

 f. 9, 10; 1. 12 f. 1—3 1 1894 C. sundeicalU, G. 0. Sars, Ornst.Norway, v. 1 p. 524 1. 184; 1. 185 

 f. 1 I 1862 Liljeborgia shetlandica, Bäte & Westwood, Brit. sess. Crust., v. 1 p. 206 f. | 

 1862 Protomedeia tvhitei, Bäte, Cat. Amphip. Brit. Mus., p. 169 t. 31 f. 2 | 1874 Lilje- 

 borgia normanni, T. Stebbing in: Ann. nat. Hist., ser. 4 v. 14 p. 10 t. 1 f . 1 | 1879 

 Cheirocralus hrevicornis, Hoek in: Tijdscbr. Nederl. dierk. ^'er., vA p. 142 1. 10 f. 10 — 13 

 1884 C. b., H. Blanc in: N. Acta Ac. Leop., u.47 p. 72 t. 8 f. 76. 77. 



Body ratber slender and compressed, pleon segment 4 produced dorsally 

 to 3, segment 5 to 4 teetb, witb stiff bristles between tbem, segment 6 

 witb 2 bristles. Head, the lateral lobes separated from the triangulär post- 

 antennal corners by a narrow incision. Side-plate 1 somewbat expanded 

 below and angularly produced, 2^ deeper in d than in 5 , ü^'^ as deep as 4^^. 

 Pleon segment 3, postero-lateral corners acutely produced. Eyes reddisb 

 brown. Antenna 1 shorter tlian peduncle of antenna 2, 1^* and 2^ joints sub- 

 equal in lengtb, flagellum shorter than peduncle, 12 — 18-jointed, accessory 

 flagellum witb 3 (Boeck) or 2 (Sars) joints. Antenna 2 nearly twice as long as 

 antenna 1, ultimate Joint of peduncle longer than penultimate, flagellum shorter 

 than botb joints combined, witb about 24 joints. Gnatbopod 1, 6*^ Joint ratber 

 shorter and much narrower than tbe elongate b^^, botb densely setose, fingei- very 

 small, denticulate. Gnatbopod 2 in ratber more slender, 6*^ Joint about 

 as long as 5^^ Gnatbopod 2 in d, b^^ Joint cup-shaped, much shorter than 

 the large, tumid, ovate 6*^, whicb is densely setose about bind margin witb 

 long setae and has a sort of sinuous palm on the inner surface armed by 

 3 or 4 irregularly placed denticles, agaiust wliich tbe curved finger impinges. 

 Peraeopods 3 — 5 in both sexes very slender and long, with slender spines, 



