662 Ischyrocerus, Corophiidae 



of which one is apically bent, but apparently without any row of denticles 

 on tbe Upper edge. Telson rounded triangulär. L. 5 mm. 



Barents Sea (lat. Tl»— 77« N., long. 50» E., depth 126—320 m); South-Pacific 

 (lat. 40» S., long. 1780 E., depth 2071 m). 



I. monodon (Heller) 1866 Podocerus m., Cam. Heller in: Denk. Ak. Wien, 

 V. 26 II p. 45 t. 4 f. 4, 5 I 1893 P.fahatus (part.), A. Della Valle in: F. Fl. Neapel, v. 20 p. 445. 



Finger of gnathopod 2 not denliculate. L. 5 mm. 



Adriatic (Lesina). 



38. Farn. Corophüdae 



1849 Corophidae, J.D.Dana in: Amer. J. Sei., ser. 2 r. 8 p. 139 | 1876 C, 

 A. Boeck, Skand. Arkt. Amphip.. r. 2 p. 619 j 1888 Corophiidae, T. Stebbiug in: Rep. Voy. 

 Challenger, v.29 p. 1154 | 1894 C, G. 0. Sars, Crust. Norway, v. 1 p. 606 \ 1893 Corofidi 

 (part.), A. Della Valle in: F. Fl. Neapel, v. 20 p. 351. 



Body usually more or less depressed. Pleon small. Side-plates usually 

 small and often not in continuity. Antennae 1 and - 2 of variable pro- 

 portions, with or without acccssory flagellum. Mouth-parts generally normal, 

 except that mandibular palp is not always 3-jointed, and tbe inner plate of 

 maxUla 1 is sometimes evanescent. Gnathopods 1 and 2 variable in eharacter 

 and relative propoiüons. Peraeopods 1 and 2 usually glandulär. Peraeopod 5 

 the longest. Pleopods often with peduncle internally expanded. üropod 1 

 biramous. üropod 2 biramous or uniramous. üropod 3 small, weakly biramous, 

 uniramous, or even without rami. Telson simple (Fig. 115, 118 p. 686, 691), 

 sometimes lobate._ 



Marine, but extending into brackish or even almost fresh water. 

 11 genera, 44 accepted species and 11 doubtful. 



Synopsis of genera: 



Üropod 3 without ramus 1. Gen. Coneholestes . p. 663 



üropod 3 (Fig. 115, 118) not without ramus — 2. 



Mandibular palp 3-jointed — 3. 



Mandibular palp not 3-jointed — 10. 



Üropod 3, inner .ramus distinct — 4. 



üropod 3, inner ramus wanting or not arti- 

 culated — 5. 



I Side plates in continuity 2. Gen. Paracorophium p. 663 



\ Side plates not in continuity 3. Gen. Camacho . . . p. fc64 



„ j Üropod 2 uniramous — 6. 

 \ Üropod 2 biramous — 7. 

 I Gnathopod 2 (Fig. 112) in cj, and not gnatho- 

 pod 1, complexly subchelate 4. Gen. Cerapus . . . p. 665 



6 



\ Gnathopod 1 in (J, and not gnathopod 2, com- 



plexly subchelate 5. Gen. Chevreuxius . p. 669 



J Antenna 1 without accessory flagellum — 8. 

 \ Antenna 1 with accessory flagellum — 9. 



8 



J Gnathopod 2 in cj complexly subchelate . . 6. Gen. Ericthonius . . p. 670 



\ Gnathopod 2 in (5 simply subchelate or chelate 7. Gen. Cerapopsis . . p. 674 



I Antennae very elongate 8. Gen. Neohela . . . p. 675 



\ Antennae not very elongate 9. Gen. Unciola . . . p. 676 



