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



6. Darmcanal mid Anliangsdriisen. Among mauy other statements of importance, Claus says, 



"der Mitteldarm, in welchen der Vormagen oft mit verengtem Trichter einflihrt, beginnt 

 iiberall mit der Einmiindung eiues einzigen Paares von Leberscliliiuchen, deren Umfang 

 und Form ini Verhiiltniss zu dem medianen Darmrohi'e mannigfach wecbselt," and 

 " Anbange des Af terdarmes oder am Ende des Mitteldarmes sind mir in keiner Gattung 

 bekannt geworden." 



7. Herz, Gefass-system und Atbmung. In tbe Platyscelidse tbe beart has only two pairs of 



venous ostia, the slits being wanting in tbe second perseon-segment ; besides tbe two aortas it 

 bas tbree pairs of lateral arteries, occurring respectively in tbe tbird, fourtb and fifth segments. 

 Of tbe branchial vesicles Claus says, " mit Ausnabme der maunlichen RluMosomen, welche nur 

 zwei Paare von Kiemen am fiinften und secbsten Beinpaare der Brust tragen, finde icb die 

 Funfzahl der Kiemenpaare iiberall eingebaltcn." Lycseopsis, as Claus himself subsequently 

 shows, is another exception, but whether that genus should hold a position among the 

 Platyscelidse he is doubtful. Bovallius places it in the family Phorcidas. 



8. Gescblechtsorgane. Entwicklung. Claus mentions by tbe way that he is unable to 



corroborate the statement of Fr. Miiller that the young of Iliiperia leave tbe egg-sheath 

 ■without abdominal feet. From a comparison of young with adult forms he draws the 

 conclusion that tbe Hyperidse have developed from the Gammarina, and that from tbe 

 Hyperidae have sprung tbe Platyscolidse as an aberrant offshoot. 



1887. Hansen, H. J., and Holm, Th. 



Oversigt over de paa Dijmphna-Togtet indsamlede Krebsdyr af H. J. Hansen, 

 in Dijmplina-Togtets zoologisk-botanische Udbytte. Avec des resumes en frangais. 

 Udgivet paa Bekostning af Miuisteriet for Kirke- og Undervisningsvaesenet af 

 KJ0benhavus Universitets zoologiske Museum ved Dr Chr. Fr. Liitken. Kjobenhavn, 

 1887. 



The account of the Amphipoda extends from page 210 to page 234, and is illustrated on 

 Plates XXL and XXIL, of which tbe explieatio is given on pages 282, 283. Spence 

 Bate's view is adopted that the so-called epimera are tbe first joints of the thoracal legs, the 

 joints of which are accordingly in the descriptions numbered from one to seven, not, as 

 many authors prefer, from one to six. Forty- one specie.s are mentioned. Onisimus caricus, 

 n. s. (Tab. xxi, Fig. 6-6f), is said to be very near to Onidmus edwardsii, Ivr0yer (Tab. xxi, 

 Fig. 8, 8a), but distinguished from it by its superior size, and among other things especially 

 by the second gnathopods, thus described, " in utroque sexu articulo sexto quam articulo 

 quinto vix duplo breviore, subtriangulo, ad apicem versus nonnibil dilatato, dimidio 

 longiore quam latiore, margine anteriore quam posteriore nonnibil longiore, apice 

 emarginato ; unguis (e articulo septimo et ungue vero formato) sat robusto, valde 

 curvato, ut intervallum inter unguem et articulum sextum praestet." Besides tbe 

 differences of the antennae in the male, female, and young of tbe Lysianassidre, Dr. Hansen 

 says that much difference may be found between the second gnathopod of the male and 

 that of the female. This he illustrates by Onisimus brevicmidatus, n. s. (Tab. xxi, Fig. 7-7e), 

 in which the female has the second gnathopod nearly as in the closely allied Onisimus 

 caricus, while in this limb of tbe male "articulus sextus alio modo formatus est, non 

 triangulus, marginibus ad apicem versus subparallelis, apice oblique truncate, ut margo 

 anterior brevior quam margo posterior evadat, 'ungue' breviore et graciliore in medio 

 margine apicali sito." Onisimus affinis, n. s. (Tab. xxi. Fig. 9, 9r(), is said to be very near 

 to Onisimus edwardsii, the distinctions being apparently only drawn from measurements of 



