186 " THETIS " SCIENTIFIC RESULTS. 



but distinct spinules, situated 0'2 mm. from the apex ; there are 

 also rudiments of another pair about 0-08 mm. nearer to the 

 extremity than the first. 



The lateral margins of the front are deeply concave, smooth, 

 adapted to the eye peduncles, each bearing a pair of spines ; there 

 is one at the base of the rostrum and another at the external 

 angle, which is scarcely visible from above ; posterior to the latter 

 is a slight groove,, immediately in front of the first lateral spine. 



The spine at the base of the outer antenna is about 0'6 mm., 

 but does not exceed the cornea of the eye, and cannot be seen 

 from above if the eye is in its normal position ; the first exposed 

 joint of the peduncle has a spine on the inner and another one on 

 the outer angle. 



The basal joints of the first antennae are large, subquadrate, 

 with straight contiguous inner borders, the pair forming an oper- 

 culum behind which the upper portions of the peduncles are 

 concealed ; the distal margins of the basal joints are slightly 

 sinuate, and each bears five or six spinules ; there is a pair close 

 together near the middle, and the rest are situated on the inner 

 and outer angles ; two or three of these spines can be seen from 

 above projecting on each side of the rostrum between the latter 

 and the inner borders of the eye-stalks ; the larger spines extend 

 about 0'2.5 mm. beyond the frontal margin. Figure 16 on 

 pi. xii. in the " Challenger " Report represents the general outline 

 and the relative proportions of the joints of the external maxilli- 

 pede, but the description does not agree with those under notice ; 

 the ischium joint, besides being acutely produced at the outer 

 distal border, has a distinct spine on its inner extremity. There is 

 an oblique denticulated crest on the anterior surface which extends 

 longitudinally from just above the base to the summit, which is 

 the highest part of the crest. In the same line on the merus 

 there is a short ridge, but here the denticles are replaced by long 

 setse ; the outer distal spine is slightly curved inwards, but that 

 on the inner is erect, not curved as is stated to be the case in the 

 " Challenger " example. 



The chelipede differs from that figured by Henderson (fig. la) 

 in having a longer carpal joint ; the relative proportions of the 

 joints are as follows : — Merus 2 mm., carpus 1 '4 mm., palm 1 "8 mm., 

 fingers 1 -5 mm. ; the latter are obtusely rounded and rather 

 strongly denticulated at their distal margins ; their outer surfaces 

 are rounded, the inner excavated. 



Total length of body ... ... ... ... 10 mm. 



Length of carapace ... ... ... ... 5 ,, 



„ „ left chelipede ... ... ... 8 ,, 



„ „ second leg ... ... ... ... 6*5 ,, 



