I 



REPORT ON THE AMPHIPODA. 541 



very name of Lilljeborg's sisecies; 157. Podocerus minuius, a minute form distinguisLud by 

 Professor Sars from Podocerus falcatus, Montagu, on the ground of its far smaller size, the 

 eyes considerably larger, tlie slighter unciliated lower antennae, the slenderer pera30pods and 

 the different colouring. As to the last point, " color flavescens fusco variegatuni " would 

 often precisely describe specimens of Podocertis falcatus. The difference in the second 

 gnathopods of male and female is just what is found in the jiulchellits and rariejatm forms 

 of Podocerus faJcahis. Boeck speaks of having taken Podocerus falcatus at 20 fathoms 

 depth, so that the occurrence of Podocerus vnnufus at a depth of 20 to 30 fathoms will not 

 be, as Sars appears to suggest, an additional evidence of its distinctness. May it not be the 

 Ischijrocerus minutus of LiUjeborg, 1851; 159. Siplionoretcs liaUidiis, said to be distin- 

 guished from Siphoncecetes typicus, Kr., and Siphonoecetes colletti, Boeck, by its small 

 size, pale colour, and the antennae thus described, " Imi paris dimidio corpore longiores, 

 articulis pedunculi sensim magnitudine decrescentibus, flagello articuUs peduncidi 2 ultimos 

 junctos longitudine feqvante vel paulo superante, 6-articulato ; 2di paris validje corporis 

 longitudinem excedentes, margine utrorive valde setoso, articulo ultimo pedunculi penultimo 

 nonnihil breviore;" 165. Caprella ciliata, the second gnathopods as figured and described 

 corresponding so exactly in form and ciliation to those often met with in Caprella acanthi- 

 fera. Leach, as to raise a presumption that Sars' specimens may belong to that very variable 

 species. The elongate flagellum of the upper antennae, the only other distinctive mark to 

 which Sars himself draws attention, is likewise proper to Caprella acardhifera. On the 

 other hand, the figure does not show the globose head so notable in that species, to the 

 distinctive shape of which Sars himself calls attention in noticing Caprella acantlii/era, and 

 the hands of the perajopods are described and figured with " acie prope basin dente minuto 

 armata," whereas in Caprella acantliifera the place of insertion of the principal spines, 

 which defines the palm, is not, as in many Caprella?, near the base of the hand but 

 some way down its margin. In regard to the ciliation or hairiness of the hand of the 

 second gnathopod, a doubt arises whether it may not be merely an adventitious growth ; 

 like the hairs depicted by Bate and Westwood on the second perKon-segment of their 

 Caprella tuherculcda, " die aber nichts Anderes als Pilzhyiilien sind," in P. Mayer's 

 opinion. 

 Besides describing new species. Professor Sars makes important observations on many old ones. 

 He regards Taiuria abijssorum, Boeck, as a synonym of 91. Tauria medusarum, Fabr., 

 so that, combining Sars' view as to the species with that of Bovallius as to the genus, 

 Pabricius' species should be called Hijperia ahijssorum (Boeck) ; 92. Paratliemisto 

 abijssorum, Boeck, is obviously identical with Bate's Hijpieria ohlivia, but as this is dis- 

 tinct from Kr0yer's Hijperia ohlivia, vf\nc]i'= Hijperia galha, Montagu, Boeck's name is 

 retained. Trijp)hana raalmii, Boeck, is referred to Dana's genus Lijcxa as 94. Lycxa 

 rnalmii. Lyca:a pulex, Marion, 1874, from the Mediterranean, is said to come very near 

 the northern species. Lysianassa plumosa, Boeck, is said to be undoubtedly the male of 

 96. Lysianassa costx, Milne-Edwards ; Lysianassa umbo. Goes, which Boeck gives as 

 Orclwmene umbo, is considered by Sars as belonging to the genus Lejndepecrcum, Sp. 

 Bate. Puntoporeia furciyera, Bruzelius, is considered to be scarcely distinct from 105. 

 Pontoporeia femorata, Ki-0yer, since Kr0yer figures the peculiar process on the fourth pleon- 

 segment which has suggested the name furcigera. The curious 107. Argissa typica of 

 Boeck is said in some degree by its general habit to recall the Ampeliscidae, and to be 

 slower in its movements than other members of the family Pontoporeiida;. 108. Batliij- 

 porcia robertsonii, Sp. Bate, is held by Sars to be a distinct species from the closely 

 allied Bathyporeia pilosa, Lindstrom, in which I cannot agree with him. Montagua 

 (Probolium) pollcdana, Sp. Bate, is mentioned as 125. Metopa pollexiana. Cressa 

 schiodtei, Boeck, is stated to be a synonym of 126. Danaia duhia, Sp. Bate. 130. 



