Hyperiopsis, Gammarideorum genera dubia et species dubiae 715 



1. H. V0ringii 0. Sars 1885 H. v., G. 0. Sars in: Norske Nordhavs-Exp., 

 v.(i Crust. I p. 231 t. 20 f. 21 | 1886 H. voeringii, Bovallius in: N. Acta Soc. Upsal., 

 ser. 3 V. 13 nr. 9 p. 32 t. 2 f. 40 | 1899 H. vöringi, Chevreux in: Bull. Soc. zool. France, 

 r. 24 p. 148. 



Body broad, smooth. Pleon segments 5 and 6 elongate. Head with 

 slight projection over base of autenna 1, Side-plates 1 — 4 only about half 

 as deep as their segments. Pleon segment 3, postero-lateral augles sub- 

 quadrate. Eyes without refractive Clements or distinctly developed pigmeut. 

 Antenna 1 not quite half as long as body, 1^* Joint short and thick, 2"^ 

 and 3*^ very small; flagellum with 1 large Joint caiTying sensory Filaments, 

 foUowed by 12 short joints; accessory flagellum of 4 joints, 1^* the largest. 

 Antenna 2 shorter and more slender. Mandible, molar strong, palp very 

 elongate. Maxiila 1, palp large, 1^*^ Joint more than half as long as 2*^. 

 Maxiila 2, inner plate not fringed ou inner margin. Maxillipeds, inner and 

 outer plates well developed, but outer scarcely reaching middle of 2^ Joint 

 of the elongate palp, 4*^ Joint of which is unguiform. Gnathopods 1 and 2 

 feeble, similar, not subchelate; 6*^^ Joint slender, scarcely longer than 5*^. 

 Gnathopod 2 rather the longer. Peraeopods 1 and 2, 4^^ Joint tending to 

 fusiform, nearly translucent, more than twice as long as o**^ and 6*^^ combined, 

 6*^ conical, carrying a mobile finger. Peraeopod 5 almost devoid of setae 

 and with indistinct articulation of its long slender joints. üropods 1 and 2, 

 peduncle longer than the rami. Uropod 3, peduncle subequal to the rami. 

 Telson as broad as long; apical lobes rounded. Whole organism fragile. 

 L. about 11 mm. 



Arctic Ocean and North-Atlantic (Norway, depth 1130 m; from stomach of 

 Kodichthys regina CoUett, depth 2410 m ; Lof oten Islea, depth 1095 m). 



Gammarideorum genera dubia et species dubiae. 



Lepleurus Raf. 1820 L. (Sp. un. : L. rivularis), ßafinesque, Ann. Nat., p. 6. 



L. rivularis Raf. 1820 L. r., Rafinesque, Ann. Nat., p. 6 | 1825 L. r., A. G. 

 Desmarest, Consid. gen. Crust., p. 274. 



Pennsylvania and at Shannon run. In brooks. 



Lusyta Nardo 1847 L. (Sp. un. : Cancer algensis), Nardo, Prosp. Fauna Venet., 

 p. 20 [ 1847 L., Nardo, Sinon. Spec. Chiereghini, p. 10. 



L. algensis Nardo 1847 Cancer a. (Chiereghin in MS.), Lusyta, Nardo, Prosp. 

 Fauna Venet., p. 20 | 1847 L. a., Nardo, Sinon. Spec. Chiereghini, p. 10 | 1869 L. a., 

 Lysita a., Nardo in: Mem. Ist. Veneto, ?;. 14 p. 331 t. 15 f. 7a— c; p. 283 | 1893 Erich- 

 thoniiis di/formis (part.)?, A. Della Valle in: F Fl. Neapel, z;. 20 p. 386. 



Head feebly rostrate. Eyes laterally prominent. Antenna 1 the longer. Gnatho- 

 pods 1 and 2 rather large. Peraeopod 3 with finger reverted. Peraeopod 5 the longest. 



Adriatic (Venice). Tubicolous on Zostera marina. 



Pephredo Raf. 1814 P. (Sp. un. : F. heteroclitus) (nom. nud.), Rafinesque, 

 Precis Decouv. somiol., p. 26 | 1815 P. (nom. nud.), Rafinesque, Anal. Nat., p. 101 | 1817 

 P. (Sp. un.: P. potamogeti), Rafinesque in: Amer. monthly Mag., v.2 p. 41. 



P. potamogeti Raf. 1817 P. p., Rafinesque in : Amer. monthly Mag., v. 2 p. 41. 

 Hudson River and Fishkill. 



