i6o 



DISCOVERY REPORTS 



The peraeon segments are produced over the side-plates in no. 2, slightly so in no. i , 

 but scarcely at all in no. 3. Postero-inferior angles of peraeon segments all quadrate in 

 nos. 1 and 3, those on segments 5-7 acutely produced in no. 2. Side-plates 1-4 not or 

 scarcely narrowed below, rounded, slightly overlapping (cf. Bate's figure), normally 

 deeper than long. In no. 1 side-plates 1 and 2 are about as long as deep, 3 and 4 longer 

 than deep. Side-plate 5 with anterior lobe shallower than posterior lobe, rounded below. 



In no. 1 only pleon segments 1 and 2 are produced into dorsal teeth. In all the other 

 specimens the tooth on segment 3 is pointed like the others. 



Peraeopods 3-5, 2nd joint broadly expanded; in peraeopod 3 broadly oval, with 

 rounded postero-inferior corner; in peraeopod 4 also broadly ovoid, postero-inferior 

 corner quadrate ; in peraeopod 5 oblong narrowing below, hind margin slightly concave 

 distally, postero-inferior corner quadrate. 



d c. 



Fig. 93. Halirages huxleyanus (Bate), a. Head, with two forms of eye shown. 

 b, c, d. Side-plates 5-7 and 2nd joints of peraeopods 3-5 respectively. 



The variations in the few specimens in the present collection are set out with a view 

 to diagnosing a little more stringently the species described by Bate. I have no hesita- 

 tion in assigning them to his species. 



On the other hand, I am of opinion that Stebbing's identification of the Challenger 

 specimen as huxleyanus was erroneous, but that he relied more on Bate's figure than on 

 the Challenger figure when he described Bovallia regis in 19 14, in spite of the figure of 

 the latter appearing to bear much more resemblance to the Challenger figure of huxley- 

 anus than to Bate's figure, which is proved to be accurate by the present specimens. 

 If the Challenger specimen is regarded as the same as Bate's species (as Stebbing does 

 in 1914, p. 362) surely regis must be synonymous. This solution of the confusion, how- 

 ever, does not commend itself after a careful comparison of Bate's and Stebbing's 

 figures, and especially when one places the actual specimens alongside one another. It is 

 certainly strange that Stebbing distinguished both forms without, however, commenting 

 on their extraordinary resemblances (telson, etc.). 



A certain amount of doubt attaches to Cunningham's specimens, but that is immaterial 

 both from a nomenclatorial and a geographical point of view. 



The colour of no. 3 is given as "pale olive-brown with pink eyes". 



Distribution. Hermite Island; ? Magellan Strait. 



