AMPHIPODA. 243 



The apex of the telson is sometimes truncate. The small setiferous notch in the 

 front margin of the side-plate of the 1st gnathopod, figured by Stebbing, is a constant 

 character; it occurs also in L. urodus, which I consider identical with this species. 



The mandibular palp has L or 2 spines in the middle of the concave side of the 

 3rd joint, which is rather more than halt' as long as the 2nd (tig. (J. inp.). 



Length of male, 6 millims. ; of female, 10 millims. 



Lysianax ccelockiiy x n. sp. Plate I., figs. 7. 



Stations LIIL, LVIII. about 16 specimens, males and females. 



Head rather longer than the 1st segment ; ocular lobe produced, subacute. 



Epistome prominent. 



Hind margin of the 3rd pleon segment rounded. 



Anterior angle of 1st pleon segment rounded, jwsterior acute. 



Upper antennae subequal to the lower ; 1st joint more than half as wide as long 

 and rather longer than the next two. First joint of the 8-jointed tlagellum subequal 

 to and like the 2nd, shorter than the 3rd ; appendage 4-jointed, the 2nd and 3rd the 

 longest (fig. 7. ant. 1 ) 



Mandibles normal, the 2nd joint of the palp nearly 3 times as long as the 3rd, 

 which lias no spine on the concave margin. Remaining mouth organs normal. 



First gnathopods strong, the hand and dactylus in the same line ; side plates large, 

 much widened below with a small notch in the anterior margin near the lower angle, 

 as in L. dnghalensis (fig. 7. gn. 1 ). 



Second gnathopods : 1st joint almost as long as the next 3 ; 2nd joint subequal to 

 the 4th ; 3rd much shorter and almost as wide as the wrist, which has the hind 

 margin very convex and squamous, the front margin straight, with divergent seta?. 

 The hand is about two-thirds the length of the wrist, the front margin rather convex 

 and truncate at the end ; the distal portion of the hind margin hollowed out, the whole 

 very setose. Dactylus much curved, the base at the angle formed by the truncate 

 end and the posterior sinus (fig. 7, gn. 2 ). 



Peraeopods as in L. cing}i,alensis. 



The 2nd uropods have spines on both the subequal rami and extend beyond 

 the 3rd (fig. 7. ur.). 



The 3rd uropods have the peduncles produced to a tooth at the outer angle and 

 considerably longer than the rami, of which the outer is slightly the longer ; the 

 whole limb without spines (fig. 7. ur.). 



Telson oval, barely reaching half the length of the 3rd uropods, not truncate. 



Length 7 '5 millims. 



This species can hardly be distinguished from L. dnghalensis, except by the 

 characteristic and peculiar hand of the 2nd gnathopods. 



* From koiXos, hollow, \di>, hand referring to the excavated palm of the 2nd gnathopods. 



2 I 2 



