Camacho, Cerapus 665 



1. C. bathyplous Stebb. 1888 C. b., T. Stebbing in: Rep. Voy. Challenger, 

 V.29 p. 1179 1. 127. 



O. Body elongate, head aud peraeon subdepressed, pleon compressed; 

 peraeon segments 3 — 7 laterally dirapled. Head, lateral lobes very small, 

 subacute. Side-plates all shallow, for the most part not contiguous, 1** — 4*^ 

 with front corner directed foi^ward. Pleon segment 3, postero-lateral corners 

 obtusely quadrate. Eyes wanting. Antenna 1, P* Joint considerably longer 

 than the head. Antenna 2, antepenultimate Joint of peduncle at least half 

 as long as 1^* Joint of antenna 1. Upper lip broad. Mandible, 10 spines 

 in spine-row; spines of 3'* Joint of palp yeiy elongate. Maxiila 1, outer 

 plate with 11 spines, 2*^ Joint of palp with 8 apical spine-teeth. Gnatho- 

 pods 1 and 2, 3^ and 4^^ joints short, 5*^^ but little shorter than 2*^, rather 

 longer aud narrower than the oval 6*^, both strongly armed, with slender 

 pectinate spines; finger matching the convex ill-defined palm; 2*^ and b^^ joints 

 longer in gnathopod 2 than in gnathopod 1. Branchial vesicles and marsupial 

 plates narrow. Pleopods 1 — 3, peduncle short, the members of each pair 

 meeting distally; slender rami wide apart; coupling spines much dentale, 

 cleft spines long; 1^* Joint of inner ramus dilated proxiraally. üropod 1, 

 peduncle longer than outer ramus. üropod 2 shorter, peduncle rather longer 

 than the subequal, spinöse rami. üropod 3, peduncle almost broader than 

 long, expanded beyond the rami, the pair meeting under the telson. Telson 

 rather broader than long, nearly circular, but with a produced angle on 

 each side of the convex apex. L. 16 mm. 



South-Pacific (lat. 41» S., long. 178» E.). Depth 2011 m. 



4. Gen. Cerapus Say 



1817 Cerapus (Sp. un. : C. iubularis), Say in: J. Ac. Philad., v. li p. 49 | 1888 

 C, T. Stebbing in: Rep. Vuy. Challenger, c. 29 p. 100, 1157 j 1893 C, A. Della Valle in: 

 F. Fl. Neapel, r20 j). 376 | 1894 C, ö. 0. Sars, Crust. Norway, v.l p. 606 | 1840 Cera- 

 podina (Sp. un.: C. abditä), H. Milne Edwards, Hist. nat. Crust., v.S p. 62. 



Body slender; depressed pleon small, its after part strongly flexed. 

 Head with distinct rostrum; eyes at lateral corners, Side-plates 1^ — 4 very 

 small, 5*^ and 6*^ larger, 5*^ — 7*^ bilobed, front lobe the deeper. Antenna 1 

 without accessory flagellum. Antennae 1 and 2, flagellum short. Upper 

 lip not bilobed. Mouth-parts normal. Mandible, 3^ Joint of palp fully as 

 long as 2*1. Maxilla 1, inner plate not or little setose, outer with 9 or 10 

 apical spines. Maxilla 2, inner plate not fringed on inner margiu. Gnatho- 

 pod 1 subchelate. Gnathopod 2 (Fig. 112 p. 667) complexly subchelate 

 and powerful in d, in Q feeble and simple. Peraeopods 1 and 2 (Fig. 113 

 p. 667) short, 2^ Joint broad and long, glandulär, front margin convex, base 

 of Joint expanded in peraeopod 1. Peraeopods 3 — 5 short, recurved, finger 

 very short, bidentate. Peraeopod 3 (Fig. 114 p. 667), 2*^ Joint rather expanded, 

 short, 4*** distally expanded on both sides of 5**». Peraeopods 4 and 5, 

 2^ Joint variable as to expansion. Branchial vesicles narrow, attached only 

 to peraeopods 1 — 3. Marsupial plates 1 — 3 narrow, 4*^ large. Pleopod 1 

 large, 2*^ and 3^ successively smaller, with 1 ramus dwindled. üropod 1 

 normal, üropods 2 and 3 uniramous, the ramus short, uncinate. Telson 

 Short, broad, bilobed, densely spinulose above. It is doubtful whether all 

 the above characters are certainly applicable throughout the genus. 



6 species. 



