262 Capt. A. C. MacGilchrist on Decapod Crustacea 



slightly shorter and in the females very slightly longer than 

 the lateral. The measurements of the male are as follows : — 



mm. 



LfiDgth of carapace, incliuling mid-frontal spine. . 55 



Greatest breadth of carapace 47 



Peptli of carapace 29 



Length of greater cheliped 01 



„ smaller „ 51 



„ first pair of ambulatory legs 85 



The cornese are very deficient in ])igment and are repre- 

 sented hy small, hemispherical, pinkish-tinged patches placed 

 obliquely (posterior aspect) on the summit of the long, 

 slender, but rigid eye-stalks, which are freel}' movable in the 

 horizontal plane. These corneal patches seem to be very 

 easily detached, for they are absent from about half the 

 number of ej'e-stalks examined. 



The chelipeds are very uneqtial in the male ; all joints of 

 the larger cheliped (the right) are enlarged in all dimensions. 

 The merus is huge, and is not curved to correspond with the 

 inflated pterygostomial region ; it is straiglit, and fully half 

 the joint projects free beyond the margin of the carapace. 

 The most marked ditt'erence between the two chelipeds is in 

 the hands. The palm of the larger cheliped is inflated and 

 its inner surface is practically smooth, being coated merely 

 by very minute vesiculous grannies. The fingers are 

 markedly different in the two chelipeds. Instead of being 

 long, slender, acute, curved, slightly excavated, on the inner 

 surface, and of equal length (tips coinciding), as in the 

 smaller cheliped and in those of the female, the fingers of 

 the larger cheliped are straight, stout, and relatively short. 

 The fixed finger is relatively very short and inflated : the free 

 finger is deep and vertically compressed ; its free border is 

 highly arched and is armed with spines, tubercles, and hairs 

 almost to the very tip. The free finger is 21^ mm. long and 

 overlaps in parrot-beak fashion the short fixed finger, Mhich 

 is only 13 mm. long. The fingers, when approximated, are 

 not close-fitting, and each has 6 or 7 coarse teeth. The 

 smaller cheliped is stouter than the legs. 



Both sternum and abdomen are much narrower than in 

 the female. At the level of the interspace between the bases 

 of the first and second pairs of ambulator^'- legs the breadth 

 of the abdomen is about ^ breadth of sternum in the same 

 transverse line. The abdomen is seven-jointed and covered 

 with coarse hairs ; the first two segments bear spines just as 

 in the female ; the other segments, however^ have neither 



