REPORT ON THE AMPHIPODA. 1563 



Genus Lycsea. Dana. 



1S52. Lycsea, Dana, Amer. Journ. Sci. and Arts, ser. 2, vol. xiv. No. 41. 



1852. „ Dana. U.S. Explor. Exped., vol. xiii. pt. ii. pp. 1009, 1017, 1443. 



1862. „ Spence Bate, Brit. Mus. Catal. Amph. Crust., p. 338. 



1874. ., Marion, Ann. d. Sci. Nat, ser. 6, t. L p. 13. 



1879. ,. Glaus, Die Gattungen und Arten der Platysceliden, pp. 32, 37. 



1885. ,, Carus, Prodromus Faunas Mediterranean, pars ii. p. 426. 



1886. „ Gerstaecker, Broun's Klassen und Ordnungen, Bd. v. Abth. ii. p. 485. 



1887. „ Bovallius, Systematical List of Amph. Hyper., Bihang till K. Svensk. Vetensk.- 



Akad. Handl., Bd. 11, No. 16. p. 32. 

 1887. ,, Glaus, Die Platysceliden, pp. 55, 61. 

 1887. Amphipronoe, Giles, On Six new Amphipods from the Bay of Bengal, Journ. Asia! Soc. 



Bengal, vol. lvi. pt. ii No. 2, p. 220- 



For the original definition, see Note on Dana, 1852 (p. 259). For a short definition 

 by Claus, see Note on Claus, 1879 (p. 492). The fuller definition by Claus is to the 

 following effect : — 



" Body Hyperia-like, with great thick head, in the male elongate, with powerful 

 pleon, in the female thick and compact. Anterior antennae concealed in a deep frontal 

 cavity, in the male with a three-jointed flagellum and thick, elongate peduncle, in the 

 female five-jointed. The hinder antennas of the male very long, folded zigzag, with 

 short stem, very long fourth joint, and extremely short terminal joint. Oral cone thick 

 and short, with compact mandibles and short maxillae. Both pairs of gnathopods are 

 complexly subchelate. Gland-cells in the third joint of the first, second, and third 

 perasopocls. The laminar first joints of the third and fourth peraeopods elongate, 

 comparatively not very broad. Third peraeopods greatly elongated, having like the 

 shorter fourth pair a strong first joint. Fifth peraeopods with broad laminar first joint, 

 (the limb) comparatively small, but with the full convenient of joints. Peduncles of 

 the first pair of uropods considerably elongated. Rami of the uropods lanceolate. 

 Telson elongate. Inner ramus of the third pair of uropods coalesced with the peduncle. " 



The upper antennae in my view should be spoken of as having a four-jointed flagellum, 

 the first joint alone being massive ; that which is in the definition spoken of as the 

 fourth joint of the hinder antennae is in my view the first joint of the flagellum of that 

 pair. 



Lycsea vincentii, n. sp. (PL CXCIX.). 



Head rounded, first three segments of the peraeon short, the second especially so, the 

 seventh segment also very short ; the skin sparsely spotted with pigment flecks. 



Eyes covering the sides of the head, the ocular pigment very large. 



Upper Antennae. — The peduncle very short, the second and third joints almost 

 evanescent ; the first joint of the flagellum bulky, the convex lower margin long, the 



