CEUSTAOEA OF FEANZ-JOSEF LAND. 109 



armature of the posterior foot-jaws (fig. 19). Tlie first pair of 

 thoracic feet are moderately slender ; the seta on the inner 

 margin of the first joint of the inner branches springs from near 

 the middle of the joint; both branches are furnished with a 

 strong terminal claw of moderate length, and the outer margins 

 of the first and second joints of the outer branches, and of the 

 first joint of the inner branches, are fringed with niiuute spines. 

 The second, third, and fourth pairs are elongate and slender, 

 and have both branches furnished with long plumose setse 

 (fig. 21). The fifth pair are large and broadly foliaceous, and 

 somewhat resemble those of Thalestn's mysis, but the secondary 

 joint is considerably smaller than the basal joint, and the 

 armature of the secondary joint is also distinctly diff"erent ; 

 moreover, both joints, besides being diff'erent in general outline, 

 have their surface ornamented with what appears to be numerous 

 minute papillae (fig. 22). The caudal furca are short (PI. 8. 

 fig. 2) and about equal to the length of the last abdominal 

 segment, and they are about as broad as long. 



Description of the male. — The male is very similar to the female 

 except that the antennules have a modified and hinged structure, 

 to permit of their use as grasping-organs. The inner branches 

 of the second pair of thoracic feet are also modified as shown 

 (PI. 7. fig. 23). The fifth pair (PI. 8. fig. 1) are much smaller 

 than in the female ; the inner portion of the basal joint, which is 

 only slightly produced, is broadly rounded, and provided with 

 three stout setse of unequal length — the middle one being the 

 longest ; the secondary joint is broadly ovate, the inner margin 

 is furnished with only a few minute hairs, but several stout 

 plumose setse spring from the outer margin and apex. 



Hah. OflT East Grlacier, Cape Flora, July 1897 ; only a few 

 specimens were obtained in the Collection. 



Remarks. The large size and robust form of this Copepod, 

 together with the large and broadly foliaceous fifth pair of feet 

 of the female, difi'erentiated the species at once from all the 

 others in the Collection. 



Thalesteis JACKSoifi, sp. n. (PI. 8. figs. 3-9.) 

 Description of tlie female.- — Body moderately stout. Length 

 of the specimen figured 2-5 mm. (J^, of an inch). Eostrum very 

 short. Antennules short, 9-jointed, the sixth joint is consider- 

 ably longer than any of the other five end-joints (fig. 4) ; the 



9* 



