Copepoda from the Falkland Islands. 371 



G. S. Brady, but differs in the structure of the second 

 maxillipeds and iu some other anatomical details. 



Fam. Tisbeidae. 



Genus Tisbe, Liiljeborg. 



Tisbe varians, sp. n. (PL XIV. figs. 6-12.) 



Female. — Antennules moderately elongated and composed 

 of joints ; the first two joints are tolerably stout, but the 

 second is distinctly longer than the first or third ; the others 

 are small, especially the penultimate joint, which is only 

 about half the size of the one on either side. The formula 

 shows approximately the lengths of the various joints : — 



1.2.3.4.5.6.7.8 



14 21 It) 10 6i 5! 3 6 



Antennse small, the outer ramus four jointed. Second 

 maxillipeds tolerably stout and armed with a strong terminal 

 claw. First pair of thoracic legs also tolerably stout ; the 

 outer ramus is rather longer than the first joint of the inner 

 one ; the first and second joints are subequal, and the seta 

 on the outer distal angle of the first joint is stout and spini- 

 form, so also is the seta at the base of the joint; end joint 

 short and furnished w r ith slender setae on its truncated extre- 

 mity ; first joint of the inner ramus moderately expanded 

 and reaching nearly to the end of the outer ramus ; it is 

 provided with a tolerably long seta on the lower half of the 

 inner margin ; a stout spiniform seta also springs from the 

 inner aspect of the basal joint and close to the proximal end 

 of the inner ramus ; the second joint of the inner ramus is 

 narrower and rather longer than the first, and a long seta 

 springs from near the proximal end of the inner margin ; 

 the end joint is very small and is provided with two short 

 claw-like terminal spines (fig. 9). Other natatory legs 

 slender and moderately elongated, as shown by the drawing 

 (fig. 10), which represents the fourth pair. Fifth pair small 

 and not very conspicuous j the end joint is moderately 

 narrow and elongated, and bears five moderately slender 

 setae round the distal end. Caudal rami short, scarcely 

 longer than the last abdominal segment. 



A few specimens of this species were obtained on a mass 

 of fish ova found by Mr. Vallentin on the shore at low-water 

 .springs. 



This Tisbe resembles in some respects the Tisbe armata, 



