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



Pleopoda posteriora tria duplicatis partibus divisa. Telson cylindraceum. Maerocephalus 

 lonriirostris n. s. M. ceplialo perlouge rostrato (rostro corporis totius § longitudinem 

 aequante). Aiiiennis siiperioribus rudimentariis. Gnatliopodis primi et secundi parium 

 chelatis. Carpis dactylorum apice productis. Presented by Sir E. Belcher. 



"Pleustes, n. g. Ceplialon rostro piroductum. Antennje superiores quam inferiores longiores. 

 Coxse, anteriores quatuor permagnse. Gnathopoda subaequalia et subobeliforme. Pleopoda 

 posteriora in duplicatis partibus divisa. Telson squamiforme. Pleustes iuherculata, n. s. 

 P. pereii segmentis omnibus, p)^Bi anterioribus duobus tuberculo dorsali medio ornatis. 

 Pereii segmentis posterioribus tribus, plei omnibus lateraliter tuberculatis. Segmentis pereii 

 omnibus, p)lei anterioribus duobus coxarum marginibus tuberculatis. Pereiopodis posteri- 

 oribus tribus coxis tuberculatis. Pleopodis posterioribus appendice interiore permagno. 



" Ampliitoe lacertosa, n. s. Ut genus sed gnatliopodo secundo permagno et chelato. Arctic 

 regions. 



" Lysianassa bidenticulata, n. s., L. antennis inferioribus superiores non superantibus. 

 Gnatliopodis paris ]}vmi\ propodo carpo longiore. Gnaiho2Mdis paris secundi carpo propodo 

 longiore. Plei segmento tertio margine posteriori denticulis duobus utrinque producto." 



In tbe Brit. Mus. Catal., Spence Bate identifies Maerocephalus longirostris with the earlier 

 Oxyceplialus armatus, M.-Edw., which had been made the type of the genus Rhahdosoma 

 by Adams and White. Pleustes tuherculata is identified by Boeck with Ampluthoe 2Mnopla, 

 Kr0yer, and as Pleustes panoplus, is accepted as type of the genus Pleustes. Lysianassa 

 bidenticulata, in the Brit. Mus. Catal., becomes a synonym of Lysianassa nugax, but by Miers 

 and G. 0. Sars its right to specific distinction is vindicated. Sars names it Socarnes 

 hidenticulatus, Bate. 



1858. Bemmelen, a. a. van. 



Bijdragen tot de Kennis ouzer inlandsclie Diernameu. (lu Bowstoffen v. e. 

 Fauna v. Nederl. 11. bl. 132). 1858. 



R. T. Maitland in 1875 includes this work in his list of authorities. In regard to Orchestia lit- 

 torea, Leach, he refers to it for the remark that " Deze soort en Talitrus saltator worden 

 aan onze stranden zee-luizen, zee-vlooien en strand-vlooien genoemd." 



1858. Chenu, and Desmarest, E. (See under the date 1874.) 



1858. Gerstfeldt, Georg. 



Ueber einige zum Tlieil neue Arten Platoden, Anneliden, Myriapoden und 

 Crustaceen Sibirien's, namentlicli seines dstlichen Theiles und des Amur-Gebietes. 

 (Aus den Memoires des Savants etrangers T. VIII. besonders abgedruckt. ) St. 

 Petersburg. 1858. pp. 20-31 (280-291), 35-36 (295-296). 



The first species mentioned among the Amphipoda is Gammarus pulex, de Geer, which he con- 

 siders to be as much at home in the whole of Siberia as in Europe, while " the Gammarus 

 from the hot springs of Natschik in Kamtschatka, of which Brandt makes mention, stands 

 at least very near it, if it be not quite identical." This comes under section a of the genus, 

 in which " das Innenglied des 6. falschen Fusspaares ist so lang oder miudestens halb so 

 lang als das aussere (Brandt)." 



Section /?, in which " das Innenglied des 6. falschen Fusspaares ist noch nicht oder hochstens 

 ein Viertheil so lang als das aussere und oft nur rudimentar," contains the following : — 



