Jassa, Ischyrocerus 657 



J. Orientalis (Dana) 1852 Gammarus o., J.D.Dana in: P, Amer. Ac, v.2 

 p. 212 1 1853 & 55 Cratophium Orientale, J. D. Dana in: U. S. expl. £xp., v. 13ii p. 843; 

 t. 56 f. 3a — b I 1862 Fodocerus orientalis, Bäte, Cat. Amphip. Brit. Mus., p. 258 t.44 f. 6 j 

 1893 P. falcatus (part.), A. Della Valle iu : F. El. Neapel, v. 20 p. 445. 



Gnathopod 2, 6th Joint subovate, palm nearly longitudinal, tridentate. L. 6 mm. 



Eastern entrance of the Strait of Sunda. 



J. ornata (Miers) 1875 Podocerus ornatua, Miers in: Ann. nat. Hist., ser. 4 

 vA6 p.75 I 1879 P. o., Mieis in: Phil. Tr., «;.168 p.210 t.ll f. 6 | 1893 P.?o., A. Della 

 Valle in: E. El. Neapel, t. 20 p. 454. 



L. 13 mm. 



Swain's Bay [Kerguelen Island]. 



5. Gen. Ischyrocerus Kröyer 



1838 Ischyrocerus (Sp. un.: I. angvipes), Kröyer in: Danske Selsk. Afh., v.7 

 p. 283, 287 I 1894 L, G. 0. Sars, Crust. Norway, v. 1 p. 587. 



Like Jassa (p. 652), except as foUows. Side-plate 2 in d not differently 

 shaped from side-plate 3. Gnathopod 2 in the Q little larger than gnatho- 

 pod 1. Gnathopod 2 in the ö with hind margin of the 6*^ Joint not produced 

 into a prominent decuiTent tooth. 



9 species accepted, 1 obscure. 



Synopsis of accepted species: 



Eyes present — 2. 

 Eyes wanting — 7. 



. f Eyes present — 2. 



_ f Uropod 3, rami more than half as long as peduncle 1. L nanoides . . p. 657 

 \ Uropod 3, rami less than half as long as peduncle — 3. 



Gnathopod 2 in Si ß*'^ Joint more than twice as long 



as broad 



athopod 2 in (5, 6tli j 

 long as broad — 4. 



, as broad 2. I. anguipes . . p. 658 



o 



1 Gnathopod 2 in (5, 6tli Joint not more than twice as 



{ 



. Peraeopods 3 — 5 rather slender — 5. 

 Peraeopods 3 — 5 rather robust — 6. 



, f Pleon Segment 3, postero-lateral corners square . . 3. L megacheir . p. 659 

 \ Pleon Segment 3, postero-lateral corners round . . 4. I. assixnilis . . p. 659 



f Eyes of moderate size 5. I. latipes . . . p. 660 



\ Eyes unusually large 6. I. megalops . . p. 660 



j Antenna 1, Ist joint as long as the head 7. I. tenuicomis . p. 660 



\ Antenna 1, Ist joint not as long as the head — 8. 



/ Antennae 1 and 2 short, robust; accessory flagellum 



J nearly as long as Ist joint of primary ....'. 8. L brevicomis . p. 661 



I Antennae 1 and 2 long, slender; accessory flagellum 

 not nearly as long as Ist joint of primary ... 9. I. tuberculatus p. 661 



1. I. nanoides (H. J. Hansen) 1887 Podocerus n., H. J. Hansen in: Vid. Meddel., 

 ser. 4 V.9 p. 162 t. 6 f. 4 — 4b j 1893 Protomedeia macviata (pari), A. Della Valle in: 

 F. Fl. Neapel, v. 20 p. 436. 



9 . Body elongate, narrow. Head, lateral lobes acute, little produced. 

 Side-plates rather small, in figure front lobe of 5*^ nearly as deep as 4*^. 

 Pleon Segment 3, postero-lateral corners broadly rounded. Eyes rather small, 

 reddish. Antennae 1 and 2 long, slender, with long setae. Antenna 1, 2^ 



Das Tierreich. 2i. Lief.: T. R. R. Stebbing, Amphipoda I. 42 



