[67] DECAPODA FROM ALBATROSS DREDGINGS. 41 t 



as long as the third, much narrower than it, and lanceolate in outline. 

 The exopod of the maxilliped is about as long as the endopod, but at the 

 distal fourth of its length it is suddenly narrowed into a slender tiagelli- 

 form tip. The endopod of the first gnathopod is almost exactly as in 

 Aristens ? tridcns, but the exopod is verj' much larger, being considerably 

 more than twice as long as the merusof the endopod ; the epipod is ap- 

 parently a little smaller, and the branchia is less dense and more slender 

 at the tip. The second gnathopod is a little shorter than the carapax 

 including the rostrum, much longer than the carapax excluding the ros- 

 trum, very slender, and reaches to about the tip of the antennal scale. 



The first three pairs of jjerseopods are slender, very nearly naked and 

 very nearly alike. The first pair reach to the tijDS of the second gnath- 

 opods, and the second and third each reach successively a little further 

 forward. In each the merus is somewhat compressed and shorter than 

 the carpus, and in the first and second pairs the lower edge is armed 

 with a slender spine near the distal end. In the first and second pairs 

 the chela is about as long as the carpus, in the third pair a little shorter 

 than the carp is, and in each the digits are exceedingly slender, nearly 

 straight, slightly separated at the bases, and much longer than the 

 slightly swollen body of the chela. The fourth and fifth perseopods 

 are very nearly alike, the fourth a little longer than the third, and the 

 fifth slightly longer than the fourth ] all the segments are slender, un- 

 armed, and nearly naked : the propodus is about a sixth of the whole 

 length, very slightly thickened proximally but narrowed distally ; the 

 dactylus is considerably shorter than the propodus, very slender, and 

 nearly straight. 



The pleon is about twice and a half as long as the carapax exclud- 

 ing the rostrum, the posterior somites strongly compressed laterally, 

 but the anterior ones not at all compressed and broadly rounded dor- 

 sally. The third somite, however, is dorsally carinated and the carina 

 projects back over the next somite in a slender compressed tooth. The 

 fourth, fifth, and sixth somites are dorsally carinated, but the carinas do 

 not project posteriorly, or only very slightly. The sixth somite is about- 

 a fourth of the entire length of the pleon, very strougiy compressed, and 

 less than half as high as long. 



The telson is not quite as long as the sixth somite, narrow, regularly 

 tapered, slightly flattened above, and armed with small dorso- marginal 

 and terminal aculei. The inner lamella of the uropodisa little longer than 

 the telson and about four times as long as broad. The outer lamella is 

 about a fourth longer than the inner, proportionally about as broad as 

 the inner, and with the outer edge terminating in a triangular tooth 

 some distance from the ovate tip of the lamella. 



The pleopods are nearly as in Aristens ? Irldens. 



The number and arrangement of the branchise and epipods is the 

 same as in Ar?sfe«s.^ trldens, Qxce\it that there is no podobranchia at 



