308 PERCY SLADEN TRUST EXPEDITION. 
Gnathopod 1 ¢: hand three times as leng as wrist, hind margin longer than palm, 
which is defined by a blunt, everted tooth, setose on the side; behind this is a large sinus 
followed by a prominent flat-topped tooth. Dactylus swollen near the middle, not 
serrate (Fig. also of gn.! 9 .) 
Perropod 3 short, with a strong distal spine on the 5th joint directed downwards. 
Perzeopods 4 and 5: the 2nd joints wider than in the ‘ Challenger’ specimen. 
Uropod 3: outer ramus rather shorter and less spinous than the inner. 
Length of female (Wasin) 7 mm. 
The ‘ Challenger’ specimen was probably immature; the differences indicated above 
are hardly enough to justify the creation of a new species, though it is quite possible 
that an adult male from Kerguelen might be perfectly distinct from the above. 
36. Lembos podoceroides, A. O. Walker. 
III. Mud. Several, mostly small females (some with ova) and young. Length of 
largest female 5 mm. 
The form of the hand of gnathopod 1 varies considerably both in males and females. 
37. Lembos leptocheirus, sp.n. (Plate 48. fig. 7.) 
II. Wasin, mud, 10 fms. One male. 
III. Buoy, canal entrance, Suez: one female. Mud: one female. 
Female (Suez). 
Head subequal to the first 2 segments united; mesosome segments increasing in 
length successively; 3rd pleon segment rounded behind; 4th longer than 5th and 
6th united. 
Eyes large, dark, wide-oval. 
Antenna 1 longer than 2. Accessory flagellum 4-jointed, reaching the middle of the 
4th joint of the 11-jointed slender flagellum and longer than the Jast joint of peduncle. 
Ant. 2 stout, 2nd and 8rd joints subequal, the latter longer than the 5-jointed 
peduncle. ; 
Gnathopod 1: side plate small, rhomboidal. Second joint naked, narrower and longer 
than the wrist, shorter than the hand; 3rd and 4th sparsely setose; wrist half as long 
as the hand, hind margin densely setose, the setze about as long as the width of the 
hand, front margin naked; hand widening a little distally, front margin convex, hind 
crenate and moderately setose; palm convex and obliquely transverse, about one-third of 
the length of the hind margin, defined by a spine, finely denticulate and shorter than the 
serrate dactylus (fig. 7,gz.!). Inthe male the side plate is produced in front in an acute 
angle. Second joint stout, naked, a little longer than and about as wide as the wrist ; this 
is as long as the 3rd and 4th joints united and half as long as the hand, the hind margin 
convex, not produced beyond the hand and densely setose, the setze increasing in length 
distally: front margin of hand convex, with rows of sets near distal end, hind margin 
straight with fascicles of sete ; palm subequal to the hind margin, oblique, defined by a 
strong sharp tooth, followed by a deep semicircular sinus and a rather large flat-topped 
