COPEPODA. 27 



Posterior antennte with Ri much longer than Re, the former with six louo- bristles 

 on the first segment, and seven and six bristles on the distal segment. Re very 

 indistinctly segmented, the proximal joint very elongated. 



Mandibles with Ei longer than Re, B 2 with one marginal bristle, masticatory 

 plate broad, with one rather large tooth and a good space between it and the next 

 five conical short teeth. 



IMaxilla with B 2 and Ri bent outwards ; B 2, Ri, and Re coalesced and almost 

 indistinguishal)le ; Li 1 with seven rather long and stout hooks and two shorter 

 bristles ; Li 2 a large lobe with three bristles, Li 2 with one bristle ; Ri indistinctly 

 segmented on the outer margin with five apical bristles ; Re scarcely segmented, with 

 only two bristles ; Le 1 with seven long and very thick bristles, and three shorter 

 Ijristles. 



Anterior foot jaws with lobes much compressed, and terminal five bristles longer 

 than the proximal and also much thicker. 



Posterior foot jaw very similar to that of Anomalocera. B2 is sliort, but rather 

 thick, and with one short bristle ; Ri short, unsegmented, with only three terminal 

 and short bristles. 



One to four pairs of feet, with RI of only two. Re of three segments. In the first 

 pair the extei'nal marginal setse of Re are long and thin, in the others the external 

 spines are short, and in all there is only one marginal spine (apical) on Re 3. 



First pair of feet, B 1 and B 2 with only slightly convex inner margin and no Si. 

 Re 1 longer than Re 2 + Re3, outside margin haired and long marginal bristle. Re 2 

 and Re 3 with similarly long marginal bristles. Se = 1:1:2 and Si = 1:1:5. Ri 2 

 nearly twice as long sls Ri 1 and with 5 Si. 



In the second pair B 2 is broader than long, the inner margin convex and without 

 hairs or bristles ; B 1 is also without Si. Ri 1 prolonged, Ri 2 shorter (as 7:10). Ri 1 

 witli 2 Si, Ri 2 with 7 Si. 



-ffe; 1 : 2 : 3 as 11 : 6 : 9, with respectively 1:1:1: Se, that of Re 1 the largest and 

 oi Re3 the smallest; the end saw about two-thirds as long as the whole Re; a small 

 curved spine distal margin of Re 3 just external to the saw. 5 Si on Re 3. 



3rd feet. B 1 and B 2 without bristles or hairs, Ri as in the preceding pair. Re 

 as in the preceding pair and with 1 -.1 : 1 Se only. 



4th feet. B I and 5 2 as befoie. Ri 1 with three Si, Ri 2 with only six Si. The 

 three joints of Re rather more equal in length, »Se 1 : 1 : 1 as in the other feet. Ri 1 is 

 more elongated than in the other feet and twice as long as Ri2. 



In the second to fourth pairs the Ri is more than half as long as the Re and 

 extends beyond the distal margin of Re 2. In all feet the number of external marginal 

 spines is certainly peculiar, the usual rule being three marginal spines on the Re 3, so 

 that the animal differs from any true Labidocera. 



The 5th teet consist of a common basal and one ramus on each side of two 

 segments B2 and Re. Ri represented only by a spine. The first and second basals are 



vol,. IV. ^ 



