110 THE VOYAGE OF II.M.S. CHALLENGER. 



dredged, which undoubtedly differ sufficiently from Apseudes spectabilis to constitute 

 the type of a new species, which I projiose to call Ap>seudes antarctica. 



The largest specimen measures 4 mm. in length. 



The cephalothorax is long and wide, nearly as long as the first four segments of the 

 thorax taken together, it is prolonged into a sharp-pointed short rostrum, the eyes are 

 well developed, the ocular lobes taper to a point anteriorly, the pointed extremity 

 being slightly bent outwards ; nearly half way along the cephalothorax, but nearer to the 

 anterior than the posterior extremity, is a notch which marks the boundary line between 

 the cephalic and thoracic regions. 



The free thoracic segments increase in length but decrease in width up to the fourth ; 

 there is, however, less difference between the first three than between the third and 

 fourth ; the fourth and fifth segments are subequal in length and breadth ; the sixth is 

 rather shorter but not perceptibly narrower than the fifth. In the first free thoracic 

 segments the epimera are prolonged into forwardly directed spiny processes ; this is not 

 the case with any of the following segments, where the epimera are small and with 

 rounded margins ; in this character Apseudes antarctica differs from Apseudes 

 spectabilis, where all the epimera are furnished with a spine. In the fourth and fifth 

 segments, which as already mentioned are longer than the preceding segments, there are 

 two lateral projections on either side about equidistant from each other and from the 

 epimera. These segments, it might be mentioned, are wider posteriorly than anteriorly ; 

 upon the terminal segment of the thorax one of the lateral spines is present on either 

 side. 



The abdomen is distinctly narrower than the thorax ; its length is about equal to 

 that of the last three segments of the thorax. The first five segments are subequal ; 

 they are furnished laterally with short epimera which terminate in a sharp spiny 

 extremity; the length of these increases in the successive segments. 



The caudal shield is a little longer than the free anterior abdominal segments ; its 

 shape is rather peculiar, and differs from that of Apseudes spectabilis in that it is 

 constricted towards the middle of its extent ; the uropoda are articulated to salient 

 processes and the caudal shield terminates in an obtusely pointed extremity. 



The antennales are a trifle longer than the cephalothorax ; the first joint of the 

 peduncle is stout and long, and slightly bent inwards ; the second joint is rather more 

 slender and very much shorter, only measuring one-third of the length of the basal 

 joint; the two following joints decrease in length as well as in breadth; the outer 

 flagellum is nearly twice the length of the inner, and is composed of eight joints of 

 irregular size, becoming, however, narrower as they approach the distal extremity; the 

 inner flagellum is composed of three slender elongated joints. 



The antenna? (fig. 2) are not very much shorter than the antennules but considerably 

 more slender ; the first joint of the peduncle is short, the second longer ; the exopodite 



