EEPORT ON THE AMPHIPODA. 115 



similar, five-jointed, being a long compressed thigh with four much shorter articulations, 

 hirsute, and unarmed ; the ten posterior legs similar and equal in size, five-jointed, the 

 thigh being long and much compressed, followed by three short fleshy joints, (the first of 

 which is the shortest,) and by a long and curved member, terminated by a nail." He 

 concludes by observing, " this description differs from that of the Cancer Medusarum, 

 Otho Fabricius, Faun. Green., No. 332, in the number of joints of the legs, and in the 

 four anterior being unarmed ; the conformation of these legs distinguishes it also from the 

 Gammarus Medusarum of J. C. Fabricius, of which a part of the specific character 

 is ' manibus quatuor monodactylis.' " It is with the latter species nevertheless that 

 Boeck identifies it, under the name Hijperia medusarum, 0. F. Miiller. Milne-Edwards, 

 Hist, des Crust, iii. p. 78, under the genus Metcecus, after describing MeVrxus medusarum, 

 Kroyer, says of it, " Le Talitrus cyanese de Sabine, que nous avions d'abord consider^ 

 comme une Hypi5rie, semble se rapprocher davantage des M(5tofeques, mais devra peut- 

 etre former un genre particulier, car d'apres I'auteur qui I'a fait connaitre, cette Hyp&-Lne 

 aurait les pates des deux premieres paires obtuses et adactyles ; mais la division en pinces a 

 peut-etre ^chappe a son attention. Du reste, cette espfece se distingue de la pr^cedente, et 

 des Hyp^ries mentionn^es ci-dessus, par la longueur beaucoup plus considerables de ses 

 antennes, dont le filet terminal est grele et multi-articule." Spence Bate, in the Brit. Mus. 

 Catalogue, p. 294, retains the species as Hyperia cyanese. 



1822. Mandt, Martin Wilhelm, bom 1799, died 1858 (G. 0. Sars). 



Observationes in historiam naturalem et anatomiam comparatam in itinere 

 Groenlandico factse. Dissertatio inauguralis quam consensu et auctoritate gratiosi 

 medicorum ordinis in universitate literaria berolinensi ut summi in medicina et 

 chirurgia honores rite sibi concedantur die xxii. M. Julii A. mdcccxxii. H.L.Q.S., 

 publics defendet auctor Martinus Gulielmus Mandt Beyenburgensis. 



In 1821 Mandt went in the " Bliicher," Captain John Eose, past Spitzbergen to the 81° of 

 north latitude. He here makes record of his acquisitions, material and scientific, in those 

 regions. In describing "Baloena Mysticetus," he says, page 10, "Partibus tenerioribus 

 cutis, axiUis, pudendis Oniscus ceti adhaeret, prassertim si tempus instat coitionis," and 

 "Vulva praecipue hoc tempore lis obsessa apparet." The Oniscus ceti here mentioned is the 

 Cyamiis mysticeti of Liitken. 



On pp. 31-37 he describes two Amphipods, of which the first has since been referred to Gui'rin's 

 Themisto, and is the earliest described species of that genus, while the second has become 

 the type of Lilljeborg's genus Eurytenes. The original account as drawn up by Lichtenstein 

 is here subjoined. 



" E crustaceorum ordine duas ex itinere retuli species, Oniscis marinis Lin : aut Gammaris 

 Fabricii accensendas nee ab ullo auctore hucusque descriptas. Quae cum museo locupletissimo 

 hujus Universitatia a me oblata essent, a viro celeberrimo hujus Musei directore Lichtenstein 

 accuratius examinataj, dignse visse sunt quarum descriptio amplior huic dissertationi 

 inseratur. Qualem vir doctissimus benevolo mecuni communicavit lectoribus naturas 

 curiosis hie offero. 



" I. Gammarus Libellula N. 



" G. capite magno globoso, corpore segmentis undeeim, pedibus quatuordecim, octo anticis 

 brevibus, uncinatis, raptatoriis, sex posticis elongatis, saltatoriis. 



" Longiiudo tota a;quat pollicem et dimidium. 



