EEPORT ON THE AMPHIPODA. 335 



roberfsoni is a distinct species, though very near to Bathi/poreia pilosa. He does not give 

 his reasons. Henri Blanc, 1884-, accepts ray view. Mclita proximri, n. s., according to 

 Norman, Melifa ohtumfa. ^ ; Mtlifa ghjdiosa, n. s. The genu.s Mxra, Leach, is given 

 as Mo;ra ; the new species assigned to it are Moera iruncatijies (Amphitoe truncatipea, 

 Spinola, MS. B. M. Wliite, Cat. of Crust, in B. M. 1847); "Mara Blanchardi": 

 Mcera jiofillimanus ; Mwra pederdcrus. Eurystheus hispinimamis, n. s., an obscure species 

 founded on a single imperfect specimen, is perhaps the female of the preceding species in 

 the same genus, named erytlu-nphfhalmus. Ariiailiia tinnfafa is given as the name of a 

 species from Pondioherry, with the synonym " Gammarus dentatus, Catalogue of thf 

 Crustacea in the Mngeum of the Jardin des Plantes." It is neither described nor figured, 

 but said to resemble closely Ainathia sahinii and Amathia carmata ; the genus Eurystheus 

 falls to the earlier Gaiuivarop>sig, Liljeborg, 1854. 



Pallcisea, new genus, is thus defined: — "Superior antennae longer than the inferior, and furnished 

 with a secondarj' appendage. Inferior antennae subpediform, having the peduncle con- 

 siderably longer than the iiagellum; the flagellum short and stout. ]SIandibles having an 

 appendage. ]Maxillipeds subpediform, having a small squamiform plate to the ischium 

 only. Gnathopoda uniform, moderately large. Pereiopoda suhequal. Posterior pleopoda 

 biramous. Telson single, cleft." 



"This genus is very nearly allied to Amathia, from which it differs more in the general aspect 

 of the animal than in structural details. The form of the inferior antennfe, together with 

 the altered condition of the maxillipeds, are appreciable characters that distinguish the 

 genera from each other." The type species is Oniscus cancdlus, Pallas, from which 

 Pallasea cancelloides, Gerstfeldt, differs apparently in a very slight degree, according to the 

 Appendix, p. 380. The name Pallasea, according to Boeck, is preoccupied for a Dipterous 

 insect, but the insect's name in Scudder is given as Pallaaia. 



Oamniaracantlais, new genus, is thus defined: — "Dorsal margin carinated, and having the 

 posterior central margin with one or more segments produced posteriorly. Pleon without 

 fasciculi of spines. Superior antenn;e having a secondary appendage. Inferior antenna? 

 longer than the superior. JIandibles with an appendage. Maxillipeds subpediform, 

 unguiculate, having the squamiform internal processes but slightly developed. Gnatho- 

 poda subchelate and suhequal, having the carpus inferiorly produced. Coxae of the third 

 pair of pereiopoda not so deep as the fourth. Posterior pair of pleopoda biramous ; rami 

 foliaceous. Telson double." 



" This genus is selected from that of Gammarus of authors generally, comprising the Division 

 AA. of M. -Edwards, and +\a of Liljeborg." Boeck remarks that it is not the inner, but 

 the outer, plates of the maxillipeds that are little developed. The type species is 

 Gammarus loricatus, Sabine. 



Upon Gammarus semicarinatus, n. s., the remarks are added that " this may be the Gammarus 

 miicronatus of Say," and that "the species is of considerable interest, as associating the 

 genera Amathia and Gammararanthus with Gammarns." Sp. Bate knew of no other 

 distinctly carinated species carrying the dorso-caudal fasciculi of spines. Previously, 

 on p. 203, he gives Say's species as Gammaracanthtis mucronatus. Garnmarus svh- 

 earinatus (Gammarus subcarinatus, Stimpsim, MS.) comes from Behring's Straits. Gam- 

 mams midtifasciatus (Gammarus multifasciatus, Stiwp.-^on, MS.) is from Grand Manan. 

 Gammarus Redmanni (Gammarus Eedmanni, Lmrh, MS. B. M., Gammarus ornatus, White, 

 Cat. Crust. B. M. 1847 (not Edu-ards)) is from Jamaica. Gammarus temiimanu.t, n. p., is 

 probably an accidental variety of Gammarus locusta, as indeed is hinted in the Brit. Sess. 

 Crust, vol. i. p. 384. 



Megamoera, new genus (answering to Gammarv.% Div. A.aa. M.-Edwards and Gammarus, Div. 

 -I- 2, Liljeborg), is thus delined : — " Dorsal segments of the pleon without fasciculi of .spines. 



