218 MARINE BIOLOGY OF THE SUDANESE RED SEA. 
nuimerous spines or short setee and its serrulate margin with long sete, 
among which the apex exhibits traces of six spines ; but both here and on the 
uropods the armature of spines and setz, though evidently by nature ample, 
has suffered damage. The dorsal surface of the earlier pleon segments is 
microscopically squamose, but like the perzeon exhibits at present very few 
spines. 
The eyes are large and dark, have forty or more components, and are 
separated by an interval about equal to their shorter diameter. 
The first antennze have a seven-jointed flagellum ; the second have one that 
is seventeen-jointed, fringed in the male with numerous long filaments. In 
essentials they do not differ from those described and figured for L. gardineri, 
yet between the two members of each pair there are small differences of 
detail, and, as is shown in the figures, a considerable difference in appearance 
may result from the positions which they assume when mounted. The second 
antenna on the left does justice to the filaments of the flagellum, while that 
on the right sets out the relative breadth of the various articulations but 
leaves the filaments in obscurity. 
The upper lip is distally emarginate. The mandibles, as usual in this 
genus, were very untractable. There is a massive very irregularly quadrate 
base, with the rest of the trunk disproportionately slender, its distal edge 
bifid, with a sharp tooth above, but the lower details obscure (probably 
agreeing with what I have figured for the mandible of L. ceylanica). Near 
the distal tooth some minute reverted denticles appear on the upper margin. 
The palp is affixed to the strong basal part, and has the first joint rather 
shorter than the second, but as long as or longer than the third. 
In this species, as in L. ceylanica, the first maxillee present a very powerful 
and strongly curved apical spine, both this and the base on which it stands 
differing rather notably in shape and proportions from those figured by 
Hansen for his Lanocira kréyert. The maxillipeds ditfer little from those of 
L. zeylanca, but the third and fourth joints are relatively rather longer, 
each being longer than broad, which is not the case in any of the species 
previously described. 
The limbs of the perseon do not offer characters of marked distinction. 
The fifth pereeopods are somewhat more slender than in L. zeylaniea, 
with the apical spines of the joints less elongate than in the male of that 
Species. 
The branches of the second pleopods are considerably narrower in pro- 
portion to their breadth than in L. zeylanica. 
Length of male 7°75 mm., breadth about 3°5 mm. ; length of female 9mm., 
breadth about 4 mm. 
Locality. Label: Sudan Pearl Fisheries Investigations. Isopoda (2). 
