290 AMPHIPODA NOUMALIA. 



peduncle nearly as long as the cophalon ; first joint longer than 

 the other two : first iirticulus of the liagelliim longer than the 

 peduncle, tapering, and fringed ui)on the inferior margin with fine 

 hairs ; the remaining articuli (after the two or three immediately 

 succeeding the first) very long (many times longer than broad) and 

 very slender. Inferior pair having only the last three joints of tlie 

 peduncle exposed, reacliing beyond the peduncle of the superior ; 

 the last joint not having the infero-distal extremity produced; 

 first articulus of the flagcUum suddenly and considerably narrowing 

 to half the diameter, w'hich is the same as that of the superior. The 

 i'cst of the animal very closely resembles L. exulans, except in 

 there being a less conspicuous inequality between the ultimate and 

 two preceding pairs of pleopoda. 

 Length -^ths of an inch. 



Hah. Carrickfergus {Professor KinaJian). 



4. Lest3:igoiius ruhescens. (Plate XLVIII. fig. 5.) 



Lestrigonus rubescens, Dana, U. 8. Exphr. Exped. p. 984. pi. 67. 

 fig. 9. 



Cephalon transversely ovate, flattened in front. Antennae subcqual : 

 superior pair nearly as long as the animal, having the peduncle but 

 half the length of the cephalon ; first articulus of the flagellum as 

 long as the peduncle, tapering : inferior pair rather longer than 

 the superior. First pair of gnathopoda having the carjDus infe- 

 riorly advanced to quite half the length of the propodos ; dactylos 

 short : second pair closely resembling the fii'st, Pereiopoda sub- 

 equal ; posterior pair having the basos nearly rectangular, the 

 infero-posterior distal angle subacute. Penultimate pair of pleo- 

 poda longer than the preceding and nearly as long as the ulti- 

 mate ; ultimate pair having the peduncle three times as long as the 

 telson, and not serrated upon the interior distal margin. Telson 

 lanceolate. 



Length ^'Vths of an inch. 



Hah. 'Peru (Professor Kmahan). PacificOcean, inlat. 18°S., long. 

 124° W. (Dana). 



The above description and figure are taken from a specimen col- 

 lected and lent to me by Professor Kinahan. The difference between 

 it and Professor Dana's description is so slight that I cannot but 

 regard them as the same species. Dana says that his specimens, of 

 which ho collected several, on the 7th of August, 1839, are only 

 1th of an inch in length, and that the antennse are longer than the 

 animal. 



