Corophium 685 



11. Gen. Corophium Latr. 



?1793 Cymothoa (part.), J. C. Fabricius, Ent. syst., v.2 p. 503 j 1806 Corophium 

 (Sp. un.: C. longicornc), Latreille, Gen. Crust. Ins., v.l p. 58 | 1888 C, T. Stebbing in: 

 Rep. Voy. Callenger, <;. 29 p. 79, 1670 I 1893 C, A. DellaValle in: F. Fl. Neapel, ü. 20 

 p. 362 I 1894 C, G. 0. Sars, Crust. Norway, vA p. 612 [ 1895 C, G. 0. Sars in: Bull. 

 Ac. St.-Petersb., ser. 5 v.3 p. 291 | 1813/14 C, Corophrium, Leach in: Edinb. Enc, 

 v.! p.432 I 1880 Corophia, H. Milne Edwards in: Ann. Sei. nat., v.20 p. 384 j 1851 

 Audoiiinia (nom. nud.), (A. Costa in:) F.W. Hope, Cat. Crost. Ital., p. 24. 



Body depressed throiighout. Head with narrow lateral lobes. Side- 

 plates small, discontinuous, 1^* conically prodiiced, tipped with setae. Eyes 

 small er imperfectly developed, on lateral lobes of head. Antenna 1 without 

 accessory flagellum; flagellum slender, with several joints. Antenna 2 (Fig. 116, 

 11 7 p. 69 1) streng, pediform, usually much longer in ö than in 9 ; flagellum 

 Short, 3-jointed, with apical hooked spines. Upper lip broad. Lower lip 

 normal. Mandible with 2-jointed palp, slender, each Joint carrying a streng 

 plumose seta; other parts normal. Maxiila 1, inner plate nearly obsolete, 

 outer with 7 spines on apical margin, 2*^ Joint of palp long. Maxilla 2, 

 inner plate fringed on inner margin. Maxillipeds, inner plates naiTow, without 

 apical spine-teeth, outer long, narrow, with slender spines on inner margin; 

 finger of palp small, with apical spine. Gnathopod 1 slender, the short 

 projecting 3^ Joint and long 5**^ densely fringed with long setae; 6*^ Joint 

 narrow, with short palm. Gnathopod 2 rather larger, 4*'^ Joint closely atta- 

 ched to hind margin of 5**^; its own convex hind margin fringed with very 

 long plumose setae in 2 rows; 6*^ Joint sublinear, without palm. Peraeo- 

 pods 1 and 2, 2*^ and 4**^ joints somewhat expanded, 5^^ very short; finger 

 slender. Peraeopods 3 and 4, 2^ Joint moderately expanded, 4*^ produced in 

 front of the short 5**^, which carries 2 oblique rows of spines, 6*^ slender, 

 not long; finger short, reverted. Peraeopod 5 long and slender, 2^ Joint 

 fringed on both margins with long setae. No branchial vesicles on gnathopod 2. 

 Marsupial plates narrow. Pleopods 1 — 3, peduncle greatly expanded on inner 

 side; the 2 coupling spines with several teeth; inner ramus the longer, without 

 cleft spines on 1^* Joint, üropods 1 and 2, rami rather short, with streng 

 spines on outer niargin. Uropod 3, peduncle short, ramus Single, laminar, with 

 some fringing setae. Telson entire, small, distinct (Fig. 115, 118, p. 686, 691). 



12 species accepted, 7 obscure. 



Synopsis of accepted species: 



j Pleon Segments 4 — 6 distinct — 2. 

 ) Pleon Segments 4 — 6 coalesced — 11. 



J Uropod 8, ramus oval — 3. 



I Uropod 3, ramus parallel-sided — 6. 



J Antenna 2 not chelate — 4. 

 1 Antenna 2 chelate — 5. 



j Telson obtusely pointed 1. C. volutator. . . p. 686 



\ Telson transversely truncate 2. C. nobile . . . . p. 687 



J Pleon Segments 4 — 6 smooth 8. C. ehelieorne . . p. 687 



\ Pleon Segments 4 — 6 spinulose 4. C. spinulosum . p. 688 



Uropod 3, ramus linear — 7. 

 Uropod 3, ramus not linear — 8. 



na 1 in (5, Ist Joint without process ... 5. C. affine .... p. 688 

 tenna 1 in ■5, l^t Joint with hooked process . 6. C. runcicorne . . p. 689 



f Anten r 

 I Antenr 



