198 THE VOYAGE OF H.M.S. CHALLENGER. 



says, is the largest species of its genus. He further iUustrates his point Ly reference to 

 the considerable size of the northern Amphipods, " Anonyx larjena, AmpJiifoe Edwardsii, 

 Gammarus Sabini, Gammarus Loaista and above all Gammarus loricatus, of which," he 

 says, " I possess an individual from Spitzbergen, of a length of more than two inches." 

 ( )n tlie -whole, he concludes that the colder seas may be regarded as the true and proper 

 home of the Amphipoda. 

 He proceeds to define several new genera as follows : — 



1. Opis: — "Pedes primi paris clielis armati portentosae magnitudinis. Reliqua cum genere 



Anonijce conveniunt." The type species is given as Ox^is: Eschnchtii Holbl." The generic 

 name being preoccupied has been changed to Opisa by Boeck. 



2. Sfpr/ocephal lis: — " Epimera, iusignis magnitudinis, loricam efficientia, sub qua latent membra. 



Caput maximum, quasi proboscideum, epimeris omnino fere tectum, oculis, ut videtur, 

 destitutum. Antennee breves (capitis altitudine non longiores) ; superiores pedunculo 

 crassissimo, flagello appendiculari minimo, uniarticulato ; inferiores subpediformes. 

 MandihuJx palpo instructte brevissimo, crasso, uniarticulato, dentato, parum mobili ; pedes 

 maxillares quasi pedunculati ; labrum maximum. Pedes primi et secundi paris manibus 

 subcheliformibus destitutL Pedes quiuti paris pedibus tertii quartique paris structura et 

 directione similes." Spence Bate corrected the error of attributing a palp to the mandibles, 

 as indeed Ivrpyer had himself done tacitly in the figures of Stegoccp)liahis inflatits, in the 

 Voyage en Scandinavie, &c. The type species, Steriocephalus mflatus, as also pointed out 

 by Spence Bate, is the same as Cancer ampidla, Phipps. 



3. Phoxus : — ^^ Caput permagnum (quintam ferme longitudinis animaUs partem eHiciens), 



triangulare, depressum, antice productum et acuminatum. Anteimsc superticiei capitis 

 inferiori adfixae, alterum par anterius, alttrum posterius, utrumque validuni, pedunculo 

 crassissimo. Antennre antrn'ores perlireves (capite breviores), flagello appemliculari 

 insolitae magnitudinis ornatse ; pedunculus fiagellis longior. Antenna posteriores parum 

 anterioribus longiores. Mandibulte sat magnse, palpo longissimo. Pedes primi et secundi 

 paris manu subcheliformi armati valida ; pedes tertii qvartique paris manu qvoqve qvasi 

 muniti subcheliformi, cujus palniam prsebent articulus tertius qvartusque juncti, ungvem 

 qvintus sextusqve ; sextum pedum par ceteris multo longius. FlageUum pedum fere 

 filiforme. Epimera permagna, margine inferiori setis sat longis instructa. Appendix 

 caudalis laminis constans duabus." For this genus Kr0yer says Captain Holbpll had pro- 

 posed the unsuitable name Spinifer, distinguishing two species, Spinifer spmosissimus and 

 Spinifer flageUiformis, which KrOyer unites in his type species Phoxus holhiJUi. The other 

 new species, given as " Phoxus plumosiis Holbl," Kr0yer afterwards thought should form a new 

 genus, an opinion acted on by Boeck, who, ever ready to make new genera, instituted 

 the genus Harpina, a preoccupied name, which he changed into Harpinia. J. Sp. 

 Schneider, 1884, calls attention to the fact that in Boeck, 1876, fig. 1 on pi. viii., 

 does not represent Harpnnia phiniosa, though it is so named. 



4. Ponioporeia : — " Antenn» validje, subpediformes, pedunculo crasso, elongato. FlageUum 



appeudiculare antennarum superioriim perpusUlum. Instrumenta cibaria brevia sed lata. 

 Pedes primi et secundi paris perbreves, robusti, illi manu lata instructi, ungve vero 

 breviore ; hi manu carentes, ungveque prtcditi rudiraeiitario. Pedes tertii qvartique paris 

 longiores, validi, subcheliformes, articulo qvarto dilatato palmam efficiente, ungve armati 

 conico, aculeato. Pedes qvinti et sexti paris recurvi, articulo primo parum modum dilatato, 

 ungve armati pusillo. Pedes septimi paris recurvi, articulo primo permagno, clyi)eiformi ; 

 articulo sexto vel ungve fere rudimentari. Epimera magna, margine inferiore plurimis 

 instructo setis plumosis (epimero excepto septimo). Pedes natatorii sat breves, ceteroquiii 

 forma vulgar! ; pedes saltatorii multis armati aculeis." The type species is Poidopureia 

 femorata, Kr. 



