KEPORT ON THE AMPHIPODA. 211 



trivial charactc/r. Tlie want of a second ramus on the third uropods, or its quite rudi- 

 mentary condition, he thinks may be of considerable importance, considering the relation of 

 these uropods to the frequent springing movements of the Gamrnari, and that on this 

 account not only his species anUdcliir, but pailager, !Milne-Edwards, tle7ifafu>t, Kroiyer, 

 hrevieaudatus, Milne-Edwards, might form a separate genus. The first three have since 

 been transferred to Melita, the last to GammareUa. 



Kroyer next describes Aora tijpiea, n. a, tab. iii., fig. -3, a-1, the new genus Aiyra being 

 described as follows : — 



" Antennx superiores flagello instructae gracillimo, flagelloque appendiculari ; cmfe.nnx infirinres 

 subpediformes. Labium inferius profunda bifldum ; lacinise ternis armatic hamis maximis 

 marginis auterioris appendiceque magna subpalpiformi ad basin marginis exterioris. Pedes 

 iiiaxillares palpo brevi. Pedes priiiii et serundi paris thoracici manu instructi subcheliformi. 

 Pes primus Toaxis maximus, articulo tertio postioe in apicem longissimum producto, lUiinu 

 augusta, ungve fere lamellari. Pedes tertii ef quarfi paris articulo quarto ovali, manum 

 prsebente, cujus ungvis eflBcitur articulo quinto et sexto. Quint u> 1 1 pjed urn par brevissimum, 

 robustum ; sextum par septimumque quinto multo longiora sed graciliora, Epinwra sat 

 parva, setis iustructa marginis inferioris. Pedes ahdoininales quarti, quinti et sexti paris 

 saltatorii ; par sextum, ut quartura et quintum, binis arniatuni stylis saltatoriis, qui vero 

 setis apicalibus (non aculeis) pi-ffditi sunt. Appendix caudalis duabus formata laminis 

 hamatis." 



There seems no doubt that Kr0yer was misled by a lateral view of the telson into supposing it 

 bifid ; his description of the " hand " in the first and second perfeopods is rightly rejected 

 by Boeck ; Kerguelen specimens of an Aora, very closely allied to Kr0yer's species, exhibit 

 the characters of the lower lip which he describes, but the marginal hooks are not so large 

 as those which he figures, and the appendages which Schipdte has designated " mandibular 

 processes," though more than usually produced, scarcely suggest the epithet subpalpifoiiu. 



As largest of the South American Amphipods he had met with, Kr0yer describes from Valparaiso, 

 Aiiq)hithoe femorata, n. s. (Tab. iii. fig. 4, a-i), 9|"' long, the antennae not included, inter- 

 mediate between Aiiipihiihoc and Phufis, and suited, Kroyer thinks, to be the type of a 

 new genus, when the Amphipoda come to be thoroughly revised. It agrees, he observes, 

 with all that Milne-Edwards says of \ua " AnipIiifJwe Gaudirhaudii" imm the P.razils, 

 except in the conical rami of the third uropods assigned to that species. But one of 

 Kr0yer's own figures shows that also in Aii/phifhoe femorata, from a certain point of view, 

 these rami may ajipear to bo conical. Kroyer thus defines the species : — " Forma robusta, 

 dcjrso rotundato, fronte, thorace et abdomine inennibus. Aidennx superiores dimidiam animalis 

 longitudinem superantes, pedunculo valido, flagello setiformi ; secuudus pedunculi articulus 

 primo parum modo brevior, multo vero gracilior; tertius articulus cum articulis flagelli et 

 longitudine et crassitudine fere conveniens. Oculi suborbiculares, minuti. Antenns. 

 inferiores subpediformes, superioribus tertia ferme parte breviores, flagello dimidiam pedun- 

 culi longitudinem ajquante, ultimumque ejus articulum longitudine superante (quinta parte). 

 Pedes tlioracici p>rinii et serundi paris feminre manu ferme rectangular!, cujus margo inferior 

 sat profunda sed angustissima prwditus est incisura ad ungvem excipiendum. Pes primus 

 maris ut feminse ; secundi vero pedis manus acuminata, incisura carens. Pedes tertii et 

 quarti paris articulo primo maximo, valde dilatato, laminari ; ungve parum niubili. Quintum 

 par robustis.simum, femore (o : articulo primo) latiori quam longo; ungve prfhensili (ut 

 et sextum par septimumque). ip^/^ej-a magna, margine inferiori piloso ; epimerum quintum 

 postice profunde et angulariter excisum ad femur quinti pedis excipiendum, quum supra 

 dorsum protendatur. Pes ahdorninal is sexti paris robustissimus, stylis brevissimis ; exterior! 

 siiblongiori, subconico, inferius bihamato et spinosissimo ; interior! suborbiculari. Ajipetidi.c 

 caudalis unica constat lamina triangular!, setis marginis posterioris quatuor." 



