AMPHIPOD GENUS LEPTOCHEIRUS. 587 



by Canon Norman for the sake of a more complete comparison 

 with Delia V^alle's account. 



The species resembles guttatus Grube in many respects, the 

 principal distinguishing points being : — the proportions of the 

 antennae ; the hand of gnathopod 1 ; sideplate 2 ; the shape of the 

 Vjasal joints of the hinder perfeopods ; the armature of the pleon ; 

 and uropod 3. 



Description (taken from the type specimen of hisjnnosv.s, a 

 female, which Canon Norman kindly allowed me to examine) : — 



Jleofl longer than perfeon -segments 1 and 2 taken together ; 

 lateral coi-ners I'ounded. 



Eyes very large ; pigment brownish black ; ommatidia large. 



Sidejjlcde 1 free of sideplate 2, about half its widtii, but not 

 equalling it in length, a little expanded di.stally and fringed with 

 long setse. Sideplates 2-5 much as in the type species for shape. 

 The 2nd is tlie largest and deepest, much deeper than the corre- 

 sponding body-segment ; exjmnded inferiorly, hind margin 

 straight, inferior margin rounded and fringed with numerous 

 plumose set&e (c/. text-fig. 146, /, with Norman's pi. xiii. fig. 2 

 and Delia Valle's pi. xii. fig. 17). The 3rd is deeper than the 

 4th ; and the 4th a little deeper than the 5th ; all fringed inferiorly 

 with setae. 



Pleon. — Segment 3, hind margin produced, rounded, crenulate; 

 crenulations 8 in numljei', each with a setule ; inferior margin 

 concave, furnished with numerous strong sensoiy spines sub- 

 marginally. Pleon-segment 4 as described by Norman, with " a 

 strong and acute angular backward projection on each side " ; 

 Dr. Pesta's account agrees with this, " das 4. Pleonsegment hat 2 

 seitliche nach auf warts geschwungene ' angles ' " (text-fig. 146, g) ; 

 Heller erroneously notes them as occurring on the 5th. The 5th, 

 indeed, carries 2 dorso-lateral angles (as stated by Delia Valle), 

 but these are exceedingly small and difficult to see in situ, not 

 much produced, acute, each with a seta inset behind. 



Antenna (text-figure 146 «, b). — Superior Antenna, as figured 

 by Delia Yalle : 1st joint of peduncle shorter and broader than 

 the 2nd, carrying a stout spine on the inner distal angle ; 3rd a 

 little more than one-third the length of the 2nd ; pjrimary 

 Jlagellura with 16 joints, each, from the 3rd, Avith a small sensory 

 filament ; Dr. Pesta says of Heller's specimen that the number of 

 joints on the right side is 17, on the left 18. The accessory 

 Jlagellum in Norman's specimen extends to the 3rd joint of the 

 primary, 5-jointed, the first 4 joints subequal to each other in 

 length, the terminal one minute, tipped with long setfe ; in Heller's 

 specimen it does not reach to the distal margin of the 3i-d joint of 

 the primar}^, " 4-gliedrig, jedoch ist flas Endglied rechts kiirzer. 

 als links." 



Inferior Antenna : 4th joint longer than 5th ; flagellum about 

 the same length as the 5th, composed of 7 joints, the first as long 

 as all the others taken together. 



First Gnathopod (PI. XVIII. fig. 17): 3rd and 4th joints more 

 densely setose than in the other species, the plumose setas being 



