Corophiidae, ConchoJestes, Paracorophium 663 



^ j Mandibular palp 1-jointed 10. Gen. Siphonoecetes p. 681 



\ Mandibular palp 2-jointed 11. Gen. Corophium . . p. 685 



1. Gen. Concholestes Giles 



1888 Concholestes (Sp. un.: C. dentalii), G. M. Giles in: J. Asiat. Soc. Bengal, 

 V. 57 p. 237 i 1890 C, G. M. Giles in: J. Asiat. Soc. Bengal, v. 59 p. 63 ; 1893 C, Siphon- 

 oecetes (part.), A. Delhi Yalle in: F. Fl. Neapel, t;. 20 p. 895, 924. 



Mouth-parts imperfectly known; otherwise agreeing with Siphonoecetes 

 (p. 681), except that uropod 2 is uniramous, and that uropod 3 has no ramus. 



1 species. , 



1. C. dentalii Giles 1888 Cd., G. M. Giles in: J. Asiat. Soc. Bengal, r. 57 

 p.238 t. 7 f. 7—11 I 1893 C. d., Siphonoecetes (part.)?, A. Della Valle in: F. Fl. Neapel, f.SO 

 p. 895, 924 I 1890 C. dentalln, G. M. Giles in: J. Asiat. Soc. Bengal, r. 59 p. 63. 



Body slender, head and peraeon thrice as long as pleon; peraeon segment 1 

 dorsally produced in a small setose lobe over base of head. Head almost 

 truncate in front, but with 2 little median points. Side-plates as in Siphon- 

 oecetes (p. 681). Eyes very small, on front angles of head. Antenna 1 stout, less 

 than half as long as body, setose, flagellnra as long as 2^ Joint of peduncle, 

 5-jointed. Antenna 2 very stout, nearly as long as peraeon, setose; ultimate 

 and penultimate joints of peduncle subequal; flagellum short and stout, 

 2-jointed, ending in 2 curved spines. Mandible of simple form and palpate, 

 maxillipeds small and unguiculate. Gnathopod 1 feebly subchelate; 5*** Joint 

 slightly longer and broader than 6*^, which is described as without palm, 

 the grasping power lying between the stilfish hairs of its bind margin and 

 the serrate finger. Gnathopod 2 little longer but much stouter; h^^ Joint 

 short, broad, cup-shaped, 6*'^ swoUen at the base, bind margin very short, 

 palm oblique, strongly armed with 3 formidable teeth; finger stout, strongly 

 serrate, while a powerful 'secondarj tooth projects obliquely on either side, 

 nearly as strong as the central tooth, and giving the finger a trifid appearance. 

 Peraeopods 1 and 2 short, 2** Joint expanded, finger long and straight. Peraeo- 

 pods 3 and 4, 2*^ Joint narrow, 5*^ stout, cylindric, armed at apex with 1 

 short stout spine, the rounded apex being also densely clothed with short 

 recurved hooks; the retroverted 6*^ Joint attached to front margin of ö'^; 

 finger forming a small but strong hook. Peraeopod 5 longer, normal, 2^ Joint 

 not much expanded, distally tapering. Marsupial plates narrow, fringed with 

 long setae. Pleopods 1 — 3 small, peduncle much broader than long. Uropod 1, 

 peduncle stout, armed with a few stout spines, rami half as long as peduncle, 

 stout, spinöse. Uropod 2 shorter, peduncle very short, broad; ramus rounded, 

 with apical recurved hooks. Uropod 3 short, blunt, apically spiniferous. 

 L. about 8 mm. 



Bay of Bengal (off the Seven Pagodas, near Madras). Depth 13 m, on a sandy 

 bottom. Makes its home in the shell of Dentalium lacteum, lining it with cemented. 

 Sandy particles. 



2. Gen. Paracorophium Stebb. 



1899 Paracorophium (Sp. un. : Corophium excavatum), T, Stebbing in: Ann. nat. 

 Hist., ser. 7 t;. 3 p. 350. 



Body compressed. Head with produced lateral lobes. Side-plates 

 continuous, 1^* not produced forward. Eyes small, on lateral lobes of head. 

 Antenna 1 slender, without accessory flagellum; flagellum with several joints. 



