568 



MRS. E. W. SEXTON ON THE 



straight, the tip curved and 2 setules inset subapically. I have 

 given figures (see figs. 17 &, 18) from both Zaddach's and 

 Norman's specimens drawn to the same magnitication. 



Perceopods 1 and 2 (figs 19 & 20) glandular; 4th joint very 

 much expanded, as noted by both Zaddach and Norman ; 6th 

 joint as long as the 4th, but much narrower ; 5th only half the 

 length ; finger strong, two-thirds the length of the preceding 

 joint, with the gland -ti per tui-e at the tip. 



Hhuler Percnopods (figs. 21-23) rapidly increase in length ; the 

 6th joint in all is much narrower and longer than the pre- 

 ceding. In perseopod 3 the joints are stout and sho)-t, furnished 

 with a few strong sensory spines ; 2nd joint obliquely oval, about 

 as wide as long, the anterior margin inset with 3 clusters of 

 jointed sensory ciliated hairs, posterior margin slightly crenulate, 

 with a setule in each crenulation, and with 4 plumose hairs 

 submarginally ; finger about half the length of the 6th joint, 

 falciform. In perjeopod 4 the 2nd joint is oval, longer than wide, 

 anterior margin with clusters of the sensory plumose hairs, pos- 

 terior margin crenulate, with a submarginal row of close-set long- 

 ciliated hairs. In perajopod 5 there is a remarkable difierence in 

 the shape of the basal joint in the male and female. In the 

 female the joint is oval, the posterior expansion narrowing distally, 

 while in the male it widens distally and is produced downwards 

 in a rounded lobe, but the curious part is that the ciliated sensory 

 hairs, instead of being inset close to the margin as in the female, 

 are at some distance from the margin on the under surface, but 

 yet give the same outline as in the female {cf. figs. 22 k 23). 



Fleopods (fig. 24). — Inner rami twice the length of the peduncles ; 

 outer rami the shorter, about three-quarters the length of the 

 inner. The peduncles of the 1st pair of pleopods carry each 

 on the outer side 9 long plumose hairs, on the inner side 1 

 exceedingly long plumose hair and 2 small coupling-spines with 

 recurved apices, the upper one (fig. 24) with 3 recurved teeth 

 on either side, and the lower with only 2. The peduncles of 

 the 2nd and 3rd pairs have only 1 or 2 long setae on the 

 outer side. The number of joints in the outer ramus is 11 

 in the 1st pleopods, 10 in the 2nd and 3rd; in the inner ramus 

 10 in the 1st, and 9 in the other pairs. 



TJropods (fig. 25) extend backward to the same level ; 1st and 

 2nd pairs much alike in construction. The peduncle of the 1st 

 is as long as the inner ramus, with 3 or 4 spines on the 

 upper curve (3 in the small specimen, 4 in the larger), and 

 1 curved spine underneath, and the falciform apical process 

 I'eaching to half the length of the inner I'amus ; outer ramus the 

 shorter, 1 spine inset on the upper margin, apex blunt with 

 a cluster of 4 stout spines ; inner ramus with a similar apical 

 cluster and 2-3 along the upper margin. In uropod 2 the 

 peduncle is not as long as the inner ramus ; it equals the 

 outer in length and carries 1 spine ; rami as in uropod 1. 

 In uropod 3 the peduncle is subequal to the rami in length, 

 outer i-amus, if anything, slightly longer than the inner, with a 



