119 



Gen. 31. Kerguelenia, Stebljing, 1888. 



Boch- extremely sliort and compact, with the coxal plates very large 

 and deep, especially those of the 4th pair. Antennae in both sexes short, the in- 

 ferior much more slender than the superior, the latter only modified in the 

 male. Oral parts poorly develojjed. Ejjistome not projecting. Mandibles 

 ])liinted at the tip, without any distinct cutting edge or molar expansion, 

 palp slender originating at the tip of the mandible. Maxillse extremely small, 

 though composed of the iisual parts. Maxillipeds with the masticatory and 

 basal lobes I'udimentary, palp elongate, with the dactylus stjdiform. Both 

 jjairs of gnathopoda slender and elongate, the anterior nearly naked and 

 terminating with a jjointed extremity, the dactyliis extending in the same 

 line as the projjodos, upon which it is scarcely movable; the posterior ones 

 finely hairy in their outer part, propodos produced beneath the extremely 

 small dactyhis so as to form a very minute chela. Anterior pereiopoda slender 

 posterior ones short and rolnist, with the meral joint considerably expanded, 

 basal joint of 3rd pair nearly linear, that of the 2 last ])airs large and lami- 

 nar. Last pair of uropoda extremely small, with rudimentary rami. Tel- 

 son likewise very small, rounded, entire. 



BemarJis. — As to the general habitus ofthel)ody, this genus, recently 

 established by the Rev. Mr. Stebbing, somewhat recalls the genus Acido- 

 stoma, with which it also agrees in the structure of the caudal appendage and 

 in the superior antennae only being modified in the male. In sevei'al other 

 essential charactei's it differs, however, veiy materially both from that genus 

 and from the other Lj'^siannassidse, thus in the ])oor development of the oral, 

 parts and in the peciiliar structure of the anterior gnathopoda. The dis- 

 covery of a well marked northern species of this remarkable genus is of 

 con.siderable interest. 



54. Kerguelenia borealis, G. 0. Sars, n. sp. 



(PI. 40, fig. 2). 



Body very compact and strongly built, with the back rounded and 

 more or less sharply curved. Cephalon longer than the 1st segment of meso- 

 some, slightly produced in front between the bases of the superior antennae, 

 lateral corners but little projecting and nearly rectangular. Anterior coxal 

 plates more than 3 times as deep as the bodj' ; 1st pair narrowly rouiuled 

 at the tip ; the 2 succeeding ones subtruncated ; 4th pair excedingly large, 

 very deeply emarginated posteriorly and forming below the emargination a 

 large linguiform lobe extending posteriorly so as nearly to encom])ass the 

 5th pair; the latter obli(,[uely rounded, slightly bilobed beh)w and a little 



