BY GEO. M. THOMSON, F.L.S. "63 



Fam. Lysianassidce 



18. Lysianax stehhingi * n. sp. (PL iii, figs., 9-18 ; PI. v., figs. 

 9 and 10.) 



The species is founded on a single specimen (a male) which 

 was obtained in a rock-pool at Pirates Bay by Mr. R. M. 

 Laing, and was handed to me by Mr. Chilton. The fol- 

 lowing is the specific character : — 



Head, with a very minute rostrum, lateral lobes rounded; 

 the back is smooth ; eyes large, somewhat reniform, with very 

 numerous ocelli ; anterior antennae stout, almost pyriform ; 

 peduncle longer than flagellum; second antennae long and 

 smooth ; mandibles smooth at the apex, without cutting teeth ; 

 maxillipeds, with the outer plate, large, rounded and entire ; 

 dactylos of second pair of gnathopoda almost obsolete ; last 

 pair of uropods very short, inner ramus rudimentary. 



.The first antennx (PI. iii., fig. 10) are as long as the head 

 and first segment of the thorax; the first joint is very stout, 

 one-third the length of the whole appendage, and quite smooth ; 

 the second and tlaird joints are shorter and less swollen, and 

 together only about two-thirds as lon^ as the , basal joint ; the 

 secood with a few setae on the lower margin ; flagellum, about 

 ten-jointed, tapering to a very fine point, each joint bearing a 

 few setae ; secondary appendage, about six-joinced, rather 

 shorter than the principal flagellum. 



The second antennce are as long as the head and three 

 anterior thoracic segments ; the peduncle is short, and has the 

 fifth joint bent, almost at right angles with the fourth, so that 

 the rest of the limb is bent back along the side of the body ; 

 the flagellum is long and many (30-40) jointed, the joints are 

 as broad as they are long, and are destitute of setae. 



The mandibles (fig. 11) end in a smooth point, and have 

 about five minute blunt spines on the margin behind it ; the 

 molar tubercle is verv feeble ; the three-jointed palp is placed 

 at a considerable distance from the apex of the limb ; the 

 second joint is the longest, and bears three small setae near its 

 extremity; the third joint is longer than the very short first 

 one, and has about four small terminal setae. 



The first maxillce (figs. 12 and 18) have the outer plate 

 ending in about ten or eleven spines pectinately, toothed on 

 the inner margin ; palp very slender, ending in one long seta ; 

 inner plate short, ending in a minute seta. 



The second maxillce (tig 14) have the outer plate narrow, 

 and ending in about ten very slender spines; inner plate, 

 broader, with rather more spines, which are stouter and slightly 

 shorter. 



In compliment to the Rev. Thos. R. R. Stabbing, author of the Report on the 

 Amphipoda of the " Challenger " Expedition. 



