1909.] FROM THE BAY OF BISCAY. 855 



reaches to a little above the base of the 2nd joint of the palp, not 

 to the middle, as Buchholz says ; it is furnished with 9 lightly 

 curved setiform spines, the apical ones inset considerably within 

 the margin. The palp is long, the joints not greatly differing 

 from each other in length. The 2nd is a little longer than the 1st ; 

 the 3rd and 4th are subequal, and longer than the 2nd ; the 3rd is 

 slightly attenuated distally ; the 4th forms a strong, almost straight 

 claw, with a row of spinules along its inner margin. The 

 greater part of the claw and the upper half of the 3rd joint are 

 covered with these spinules, and, in addition, the 3rd joint carries 

 a number of strong setfe on the inner surface, the apical ones 

 nearly as long as the succeeding joint. 



Gnathopods — exactly alike in both specimens with the exception 

 of a slight difference in the length of the joints of the first 

 gnathopod in Buchholz's specimen, due, I consider, to age and 

 fuller development. In this specimen the first gnathopod is 

 slightly longer than the second ; the 2nd and 6tli joints are sub- 

 equal to each other in length (as in Sars's specimen) but longer in 

 proportion to the side-plate ; the hand is a little longer than the 

 hand of the second gnathopod, but agrees wdth it in all details. 



Perceopoda — exactly alike in both specimens. The terminal 

 joints are more curved in the hinder peraeopods than in the 

 anterior : all are provided with a plumose seta proximally. The 

 2nd joints of the hinder perseopods are beset with small spines 

 anterioi'ly and are sei-rated posteriorly, each serration having a 

 setule inset. 



The incuhcdory lamellce are attached to the second gnathopod 

 and the first three peraeopods. The two anterior lamellfe are 

 exceedingly large and wide, and deeply hollowed ; that of the 

 3rd perfeopod is very small and narrow, with the hind margin 

 straight. 



The branchial vesicles are small, that attached to the second 

 gnathopod being the smallest ; they increase rapidly in size to the 

 4th perasopod. 



Pleopods. — First pleopod ; the outer margin of the pedvincle is 

 fringed Avith long plumose setfe, about 14 in number; outer 

 ramus 9-jointed, inner ramus 8-jointed, with 2 cleft spines on the 

 1st joint ; 1st joint very large in both rami. Second pleopod with 

 only 1 or 2 setae on the peduncle ; outer ramus 8-jointed ; inner 

 7- jointed, with two cleft spines. Third pleop>od with 1 cleft spine. 

 Uropods. — Fh^st uropod ; rami subequal to the peduncle in 

 length ; inner ramus scarcely longer than the outer. Outer ramus 

 in second and third uropods two-thirds the length of the inner. 



Telson. — Exactly as figured by Sars, in both specimens. It 

 carries 2 simple seta3 near the apex, and a pair of long mobile 

 ciliated hairs on either side. 



