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



minores, uugue parvo, minus cuvvato, p. 6-ti et 7-mi multo longiores, longitudine 2-ili paris, 

 aiticulo 2-do dilatato, 6-to (tarsus) teuui et multo longiore quam in antecedente, ungue tenui 

 curvo. Pedes spiirii paris 1-mi et 2-di fortes, spinalis multis armati, pedunculo maxime 

 dilatato, ramis longis, ^a?7s l-ini multo majores, spina magna inter ramos posita, paris 

 postremi pedunculo maxime incrassato, margine apicis externo-inferiore piloso, ramis 

 bi-evissimis — ramo interno vix longiore — in apioe spinulis et pilis parvis armatis. Telson 

 basi lata, fere recta, lateribus maxime convexis in apicem obtusum convenientibus, dorsaliter 

 postice carina Iffivi in denticulum parvum antrorsum producta, subtus fasciculum minutum 

 spinarum gereus. Color lucide-brunneus vel subgriseo-flavus. Mas. Pedes parts 2-di 1-mo 

 majores, fortissimi, carpo brevi triangulari, manu valida oblonga, pasue alteram tantum 

 longiore quam lata, margine anteriore convexa, ungue fortissimo curvo, | articuli proximi 

 asquante. Femina. Pedes paris 2-di 1 mo simillimi. Laminx fotorix longie, ad apicem 

 paulo latiores, cii'ris longis mollibus dense marginatK. Ova ovalia, flavescentia, long. 0,54 

 mm. Long. (? usque ad 12 mm., $ 8,7 mm." 

 " Subdivisio. II. Vagantia Sp. Bate and W. Tribus. A. IS'atatoria Sp. Bate and W. Fam. 27. 

 Gammaridie Sp. Bate and "VV.," contains " Subfam. a. Gammarides Sp. Bate and "VV. Gen. 

 51. Gammarus, Fabr." 67. Gammarus pcecilurus, Ratlike, Tab. vii. fig. 28-36, with 

 Gammarus gracilis, Rathke, and " Gammarus Krijyeri," Eatbke, for synonyms, followed 

 by a description and this " Additio," " Nonnulla exemplarium sinus Tahanrohensis aber- 

 rantia : alia de, pedes sp)urii paris postremi spinis tantum armati, setis destituti (cbaracteres 

 essentiales Gammari Kroijeri T\.dXhkQ), a].ia. i.t, p. spurii paris p)ostremi ramo majoro setis 

 plumatis densis ornato, spinis tantum duabus lateralibus et spina magna apicali nulla ; 

 praeter ea, nonuulli $ $ aberrantes de, ante/mm inferiores pilis longis crispis densissimis, 

 permultis pedibus 1-mi — 4-ti paris, ornatje." By Boeck Eathke's three species here men- 

 tioned are regarded as synonyms of Gammarus marinus, Leach. 

 Gen. 52. Mdita, Leach. 68. Melita palmai-a (Montagu) Leach, with " Gammarus Dugesii ( = ? ). 



M.-Edwards," among the synonyms, followed by a long description. 

 Gen. 53. Niphargus, Schiodte. 69. Niphargus ponticus, n. s., Tab. viiL fig. 12-14. "Caput 

 segmentis tribus insequentibus jimctis paulo brevius. Segmentorum abdominalium quodque 

 in dorso postice setulam spiniformem gerens. Antennm superiores abbreviatas, reverse 

 segmentum 4-tum attingentes, paulo setosie, pedunculo paulo breviore quam caput, articulo 

 1-mo oblongo, crasso, 2-do dimidium 1-mi vix excedente, paulo longiore quam 3-io, flagello 

 4-articulato, longitudine pedunculum ajquante, articulis longis, deorescentibus, flagello 

 secundario bi-articulato, ajque longo ac art. 3-ius. pedunculi. Antennse inferiores pedunculo 

 hand incrassato, articulo 1-mo (brevissimo) et 2-do (paulo longiore) junctis 3-io brevioribus, 



3-io elongato, longiore quam art. 2-dus superiorum, 4-to Oculi subovales, sat 



magni. Pedes paris l-mi ei 2-di carpo elongato, subtus dilatato, latiore et longiore quam 

 mauus, manu quadrangulare-elongata angulis rotundatis, palma transversa, convexa, postice 

 setulis spiniformibus armata, ungue curvato acuto, in basi dilatato et in margine posteriore 

 setulas 3 emittente, p. 3-ii et Jf-ti articulo 2-do lato, 4-to antrorsum dilatato subtus latiore, 5-to 

 paulo dilatato, ungue brevi basi incrassato, vix curvato ; pi. posteriores 3 vaUdiores, spinis 

 nonnullis armati, articulo 2-do latissimo subtus angustato, ungue majore. Pedes spurii paris 

 postremi pedunculo crasso, ramo interiore minutissime-tuberculiformi, vix distincto, exteriore 

 magno, crasso, longe-conico, segmentis tribus posticis junctis longiore, articulo 1-mo fere 

 duplo longiore quam pedunculus et in apice spinis 3-4 armato, 2-do dimidium fere primi 

 ff.quante, in apice bisetoso ; p. parium antecedentium fere Eeque (usque ad basin ramorum 

 ultimi) prominentes. Telson lateraliter oblongum attenuatum pedunculo pedis postremi 

 longius, apice bi-spinuloso. Color brunnescens. 1 exempl. long. corp. 2,1 mm.; ant. sup. 

 0,73 mm.; pes caudalis 0,31 mm." 

 Gen. 54. Pherusa, Leach, with Ampldtlwe (pars), M.-Edwards {iiec Dana) ; Plierusa, Sp. Bate 



