Cbeluiidae, Clielura 693 



39. Fain. Cheluridae 



1847 Cheluridae, G. .1. AUman in: Ann. nat. Hist., v. 19 p. 361 | 1876 C, A. Boeck, 

 Skand. Arkt. Amphip., v.2 p. 645 | 1888 C, T. Stebbing in: Rep. Voy. Challenger, u 29 

 p. 218 I 1894 C, G. 0. Sars, Crust. Xorway, v. 1 p. 626 | 1893 Cheliiridi, A. Della Valle 

 in: F. Fl. Neapel, i;. 20 p. 345. 



Pleon Segments 4 — 6 coalesced. Side-plates small. Autenna 2 with 

 blade-like flagelliira. Mouth-parts on the whole normal. Pleopods with pedimcle 

 produced on the inner side. Uropods 2 and 3 abnormal (Fig. 119 p. 694). 



Marine. 



1 genus witli 1 species. 



1. Gen. Chelura Phil. 



1839 Chelura (Sp. un.: C. terebrans), A. Philippi in: Arch. Naturg., v.öi p. 120 | 

 1876 C, A. Boeck, Skand. Arkt. Amphip., v.2 p.646 | 1888 C, T. Stebbing in: Rep. 

 Voy. Challenger, v.29 p. 181, 217, 1670 | 1893 C, A. Della Valle in: F. Fl. Neapel, r.20 

 p. 346 I 1894 C, G. 0. Sars, Crust. Norway, v. 1 p. 626 | 1847 Nemertes (nom. nud.), A. 

 White, Crust. Brit. 3Ius., p. 90. 



Body (Fig. 119 p. 694) broad, snbdepressed, pleon segments 1 and 2 very 

 Short. Head without rostrum. Autenna 1 short, with accessory flagellum. An- 

 tenna 2 longer and much gtouter. Mouth-parts prominent. Upper lip with the 

 margin entire. Lower lip witli inner lobes thin, adpressed. Mandible, molar 

 strong; palp rather short, 3*^ Joint about as long as 2"^. Maxiila 1, inner plate 

 naiTOw, tipped with 3 short setae, outer with 9 spines, palp long. Maxiila 2, 

 inner plate having 2 setae on inner margin, of which the more distal is the 

 longer. Maxillipeds, inner plates rather long, its apical spines slender, 

 seemingly unaccompanied by spine-teeth. Gnathopod 1 the strenger. Peraeo- 

 pods 3 — 5, 2^ Joint little expanded. üropod 2 subdorsal in position, with 

 greatly expanded peduncle and very short rami. üropod 3, peduncle very 

 Short, inner ramus rudimentary, outer large and laminar. Telson entire. 

 Only one pair of hepato-pancreatic coeca. 



1 species. 



1. C. terebrans Phil. 1839 Ct., A. Philippi in: Arch. Naturg., v. 5i p. 120 

 t. 3 f. 5 I 1847 C. t, G. J. Allman in: Ann. nat. Hist., v. 19 p. 361 1. 13, 14 | 1880 C. t, 

 S. I. Smith in: P. U. S. Mus., v.2 p. 233 f. | 1888 C. t., T. Stebbing in: Rep. Voy. 

 Challenger, «7.29 p. 1695 j 1893 Ct., A. Della Valle in: F. Fl. Neapel, u20 p. 347 t. 6 

 f. 3; t. 7 f. 1—22 I 1894 C t., G. O. Sars, Crust. Norway, v. 1 p. 627 t. 225 i 1847 

 Nemertes nesaeoides (nom. nud.), A. White, Crust. Brit. Mus., p. 90 | 1863 Chelura 

 terebans. Bäte & Westwood, Brit. sess. Crust., v. 1 p. 503 f. ] 1868 C pontica, Czerniavski 

 in: Syezda Russ. Est., Syezda 1 Zool. p. 95 t. 7 f. 1^ — 18 | 1868 Limnoria xylophaga, 

 E. Hesse in: Ann. Sei. nat., ser. 5 v. 10 p. 101. 



Back broadly vaulted, with setules rising from bind margin of the 

 Segments. Pleon segment 3 dorsally produced to a conical curved process 

 much longer in <5 than in Q , with a short process on each side of it; the follo- 

 wing segment (4**» — 6**1 in coalesceuce) is dorsally flat, rectangular, in ä nearly 

 half, in Q about ^a as long as the rest of the body. Head, lateral lobes 

 rounded, post-antennal corners well delined. Side-plates successively less 

 deep, 1^* rounded quadrate, 5*^^ and 6^^ bilobed. Pleon segment 3, postero- 

 lateral corners quadrate. Eyes on lateral lobes of head, small, rounded, 

 dark. Antenna 1 about ^/^ ^^ long as body; flagellum rather setose, as 

 long as 2"^ and 3<^ joints of peduncle combined, 6-jointed; accessory flagellum 

 with 2 joints, 2^ minute. Antenna 2 curving; ultimate Joint of peduncle little 



