436 



the latter it is chiefly distinguished Ijy the great length of the superior 

 antenuiE, and by the presence of calceolae on both pairs in the 2 sexes. 

 Moreover, the mandibular palp differs by its great size, and tlie very full 

 development of its terminal joint. Besides the type species described belowi 

 the H. qnadrispinosus, recorded by the author from the Norwegian North 

 Atlantic Expedition, undoubtedby belongs to this genus, and also the very 

 distinct form described by the Rev. Mr. Stebbing from the Challenger 

 Expedition, as H. Imxleyanus, would seem to be congeneric. 



2. Hallrages fulvocinctus, (M. Sars). 



(PI. 1.54). 

 AmpMtlioc fulvocincta, M. Sars, Christ. ViJ. Selsk. Forh. 1854, p. 141. 



Syn. : Pherusa tricuspis, Stimpson. 

 » Paramphithoe fulvocincta, Goes. 



Body slender, with the anterior part of the back evenly rounded; 

 last segment of mesosome and the 2 anterior ones of metasome each produced 

 dorsally to a well-defined, acute projection. Cephalon shorter than the first 

 2 segments of mesosoine combined, rostral projection very slight, lateral 

 corners broadly rounded, postantennal ones produced to a short acute pro- 

 jection. Anterior pairs of coxal plates less deep than the body, and rounded 

 quadrangular in form, increasing successively to the 4th pair, which are 

 slightly eraarginated posteriorly, with the infero-posteal corner somewhat 

 produced. Epimeral plates of metasome rather large, those of penultimate 

 pair produced at the lateral corners to a sharp, recurved point, those of last 

 pair forming a broad lamellar expansion, transversely truncated at the tip 

 and finely serrated on the edge, its inferior and superior corners being acutely 

 produced. Eyes rather large and of oval form, visual elements well defined, 

 pigment bright red. Superior antennse in female exceeding "/s of the length 

 of the body, 1st joint of the ])eduncle about the length of the other 2 com- 

 bined, last joint very small, and having the terminal lamella obtusely 

 truncated at the tip, flagellura more than 4 times as long as the peduncle, and 

 composed of numerous short articulations, the 1st of which is much the largest. 

 Inferior antennse still longer than the superior, and having the last 2 joints 

 of the peduncle about equal-sized, flagellum nearly 4 times as long as the 

 peduncle, and, like that of the superior ones, carrying small calceolae, arranged 

 in a double row. Both pairs of antennse in male still more elongated than 

 in female, otherwise of much the same sti'ucture. Anterior gnathopoda with 



