REPORT ON THE AMPHIPODA. 901 



the definition ; finally, of tlic telson it may be said that it is whole or emarginate, the 

 latter epithet applying to Halirages fulvocinctus, M. Sars, and Halirages huxleyanus, 

 Sp. Bate. 



Halirages fulvocinctus (M. Sars). 



1859. Amphifhoe fulvocincta, M. Sars, Oversigt over norsk-arkt. Krebsdyr, p. 22 (141). 



18G2. „ „ Spence Bate, Brit. Mus. Catal. Amph. Crust, p. 381. 



1863. Pherusa tricuspis, Stimpson, Proc. Acad. Nat. Sci. Philad., p. 138. 



1865. Paramphithoe fulvocincta, Goes, Crust, amph. maris Spetsb., p. 9, fig. 15. 



1870. Halirages fulvocinctus, Boeek, Crust, amph. bor. et arct., p. 116. 



1876. ,, ,, Boeck, De Skand. og Arkt. Amph., p. 342, pi. xxiii. fig. 11/. 



1884. ,, „ J. S. Schneider, Crust, og Pycn. Kvamangsfjorden, p. 102. 



Upper Antennse. — The second and third joints of the peduncle crowded with small 

 calceoli on the under side ; the third joint distally produced below in a thin laminar 

 process with serrate edges, about which calceoli and small spines are attached ; the very 

 numerous joints of the fiagellum, so far as observed, were all armed with a calceolus 

 apiece and some cylinders, the projecting distal points to which these are attached not 

 being in line, give the fiagellum a strongly serrate appearance on the under side. 



Lower Antennse. — The first three joints are short, with short spines on the upper 

 margin ; the fourth and fifth joints subequal, slightly curved, the upper margin convex, 

 serrate, carrying many calceoli ; the joints of the fiagellum very numerous, armed with 

 calceoli, the first joint long but showing rings as of many short joints in preparation, the 

 joints immediately following the first much broader than long. 



First Maxilla}. — Inner plate between oblong and oval, with five very unequal, 

 strongly plumose setse on the slightly oblique apical margin, the setse graduated in size, 

 the largest innermost ; the outer plate on the broad apical margin carrying eleven spines 

 of various lengths with teeth of various sizes, varying in number from two to six ; the 

 long second joint of the palp strongly ciliated, having a row of setiform spines passing 

 from the distal part of the inner margin towards the outer apex, the distal margin 

 strongly denticulate and set with spines or spine-teeth. Boeck assigns six setse to the 

 inner plate and ten spines to the outer, of which half are pectinate (kamdannet), the 

 other half serrate (saugtakket) ; Schneider says, "I have only seen eight short spines, 

 which are all pectinate (alle bar kamtsender), on the outer plate, while the inner plate 

 only has five plumose setse on the apex." 



Second Maxillse long and rather narrow, the inner plate a bttle shorter than the outer, 

 with four plumose setse on the inner margin graduated in size, the lowest the longest ; 

 the apical margin fringed with spines shorter than these setse ; the apical margin of the 

 outer plates fringed with feathered spines longer than the spines on the inner plate. 

 Schneider says, "The inner plate has below on the inner rim three thick plumose setse, 

 the outer has only simple fine setse." 



