433 



eiopoda extremely slender ami elongated, witk greatly produced and attenuated 

 dactj'li ; the 3 posterior pairs successively increasing in length, basal joint 

 of last pair much larger than that of the 2 preceding pairs. Last pair of 

 uropoda ver3^ ft^Hy developed, projecting far beyond the others. Telson oval 

 triangular, not incised at the tip. 



Bemarlcs. — The present new genus is founded upon the form described, 

 at an earlier date, by the author as Halirages inermis. A closer examination 

 of this form has indeed shown it to differ in some particulars rather materially 

 from the species generally referred to the genus Halirages of Boeck, so as 

 more properly to be regarded as the type of a separate genus. Thus the 

 extraordinary development of the postantennal corners of the cephalon is rather 

 peculiar, and also the gnathopoda differ considerably as regards the shape 

 of the propodos, which somewhat resembles that in the genus Bhaclwtropis. 

 The genus Sknopleura of Stebbing would seem to have much in common with 

 the present genus; but as the superior antennae in that genus are stated to 

 be longer than the inferior, and moreover the gnathopoda are much more 

 strongly built, I find it unadvisable at present, to combine both. The 

 genus comprises as 3'et but a single species, to be described below. 



1. Haliragoides inermis, G. Sars. 



(PI. 153). 

 Ilaliragcs inermis, G. 0. Sars, Oversigt af Norges Crustaceer, I, p. 103, I'l. 5, fig. .5. 



Body very narrow, and having the hack evenly rounded tlirougliout. 

 without any trace of keels. Cephalon considerably exceeding in length the 

 first 2 segments of mesosome combined, and rather deep in its posterior part. 

 rostral projection very slight, lateral corners small, angular, postantennal 

 ones greatly produced, forming on each side a narrow, linguiform, deflexed 

 lobe, finely serrated anteriorly. First pair of coxal plates obliquely expanded 

 distally, anterior corner rather produced, and narrowly rounded at the tip; 

 the 2 svicceeding pairs rounded quadrangular in form, and having at the 

 infero-posteal corner a group of about 6 delicate bristles; 4th pair scarcely 

 more than half as deep as the corresponding segment, being somewhat broader 

 than the 2 preceding ones, and more distinctly emarginated posteriorly; 5th 

 and Gtli pairs twice as broad as they are dee]i, and having the posterior lobe 

 larger than the anterior and evenly rounded. Last pair of epimeral plates 

 of metasome having, like the preceding pair, the lateral corners produced to 

 a short acirte projection, posterior edge evenly curved and quite smooth. 

 Ej^es rather large, and oval in form, visual elements imperfectly developed, 



56 — Crustacea. 



