252 THE VOYAGE OF H.M.S, CHALLENGER. 



" 57. Gammai'us Duehenii n. sp. — A.ntecedenti \Gammarus loeusfa, Fabr.] simillimus, tamen 

 distinctus : magnitudine minori ; antennis magis hispidis, superioribus longiorLbus ; flagello 

 appendicular! breviore circit. 5-articulato ; tuberculis segment! 4 : i, 5 : i et 6 : i abdominis 

 pilis longis ; lamis pedum spuriorum ultimorum insigniter inrequalibus, iuteriore tertia parte 

 minore &c. Haud infrequens videtur, quum multa adsint specimina. Apud omnia ratio 

 ilia inter ramps pedum spuriorum ultimorum plane constat." This in 18-54 he makes a 

 synonym of Gammarus loeusfa. 



"59. Gammarus Sundevallii, H. Kathke. Femina mari dissimilis mauibus jied. l:i et 2:i 

 p.iris minutis fere cequalibus." This is now known as Cheivoeratus sunderalJi. 



" 60. Gammarus assimiJis, u. sp. — Prsecedenti simillimus, prtecipue diversus : pedibus maris 

 secundi paris longiores [longioribus], manu elongata, fere rectangulari, infra pone unguem 

 oblique truncata et tridentata, antice et postice asqualiter, non dense, pOosa, Inter feminam et 

 uiarem dissimilitudo eadem ac prajcedentis." This is now called Cheirocrafus assi7m/is. 



" 64. Gammarus Zebra, H. Eathke. — Generi Ischyroceri, Kr. potius adnumerandus," 



" 65. Ischyrocerus anguipes, Kr. 



" 66. I. (Podocerus) calcaratus (H. Rathke) Sine dubio eadem species ac antecedens, cujus calcar 

 manus pedum secundi paris non evolutum, sed tantum tuberculo minute indicatum." 



" 68. Leucothoe — 1 Sine dubio juniores L. clypeatas, Kr. Femina ovifera minuta : antennis 

 superioribus inferioribus brevioribus ; manu pedum secundi paris mediocri, ovata, margine 

 posteriore medio uni-dentato ; prseterea L. dypeafse similis. Apud qusedam specimina 

 minutissima, sed tamen ovifera, ovis solummodo paucis majoribus, antennae fere eadem 

 longitudine sunt, manus pedum, secundi paris vero eodem modo formatce." This is now 

 known as Mffopa clyjJeafa. 



Under " Loemodipoda (amphipoda)," he gives 



" 70. Caprella lobata (Miill) ; Kr. — Admodum variabilis. Aculei partiiim superiorum corporis 

 nullam distinctionem specificam prrestare videntur. Feminse plerumque supra sunt aculeatfp,, 

 earumque annuli thoracici et manus breviores." This may belong to variety y of Krpyer's 

 Caprella lobata, which Mayer puts, with the other varieties, under Caprella linearis (Linne) 

 Bate. 



1851. Peters, Wilhelm Carl Hartwig, horn 1815 (Hagen). 



Bericht iiber die Leistungen in der Naturgeschichte der Crustaceen, Aracliniden 

 und Myriapoden wahrend der Jahre 1849, 1850 und 1851. Arcliiv fiir Natur- 

 geschichte. Siebzehnter Jahrgang. Zweiter Band. Berlin, 1851. pp. .393-467. 



1852. BURGERSDIJK, LEONARD ALEXANDER JoHANNES. 



Specimen academicum inaugurale, continens annotationes de quibusdam 

 crustaceis indigenis, quod .... publico ac solemni examini submittit Leonardus 

 Alexander Joannes Burgersduk, e pago Alphen Batavus, ad diem xix. m. Junii 

 A. MDCCCLii. Lug;duni-Batavorum. 



Burgersdijk is at great pains to discriminate Gammarus pulex hovix Rusel's species which Gervais 

 named Gammarus roeselii. It will be useful to see in juxtaposition the synonymy, as 

 he has drawn it up for each species. 



