Goree Island, Senegambia. 211 
Lophozozymus (Lophoxanthus) sexdentatus, sp. n. 
(PI. XIIL fig. 2.) 
In this pretty little species the carapace is less than one and 
a half times as broad as long; its dorsal surface is less convex 
than usual, and rather strongly lobulated on the postfrontal, 
gastric, and hepatic regions, and on the sides of the carapace 
behind the antero-lateral marginal teeth; the cervical suture 
and the depressions between the lobules are very distinct ; 
the surface of the carapace (viewed under a lens) appears 
punctulated ; the frontal margin projects somewhat more than 
is usual in the genus, and is straight and entire. The first 
(or outer orbital) tooth and the second tooth of the antero- 
lateral margins are not developed, the three posterior antero- 
lateral marginal teeth are prominent, triangulate, and acute, 
the front part of the antero-laterai margins and the subhepatic 
and pterygostomian regions, and the narrow epistome are 
more or less pitted and eroded. The segments of the post- 
abdomen are all separate and distinct in both sexes. The 
basal antennal joint reaches to the infero-lateral angles of the 
front. ‘The outer maxillipedes are punctulated on their outer 
surface, the transverse merus joint being marked with two 
somewhat larger and deeper depressions. The chelipedes in 
the male are short, robust, and (in the specimens I have 
examined) of unequal size; arm or merus joint very short ; 
carpus somewhat pitted above and on its outer surface, and 
with a spine on its inner surface ; palm slightly convex on its 
upper and inner surface, and more or less pitted above and on 
its outer surface; fingers short, compressed, and nearly 
meeting along their inner edges when closed; the dactylus or 
mobile finger carinated above. 
Ambulatory legs of moderate length, compressed, and cari- 
nated above; dactyli not carinated and closely pubescent. 
Coloration yellowish orslaty ; chelipedes and ambulatory legs 
sometimes reddish, fingers brownish. Length of the largest 
example rather over 5 lines (11 millim.); breadth about 
74 lines (16 millim.); the largest male is a trifle smaller. 
All the specimens are males, except the largest, which 
differs in coloration, having the carapace marked with reddish 
blotches on a paler ground. In this example one chelipede 
only remains; in this the palm is more strongly pitted on its 
outer surface, and the fingers are pinkish. 
M. Alph. Milne-Edwards has recently * established the 
genus Lophoxanthus tor two species which apparently scarcely 
differ from Lophozozymus, except in the more depressed cara- 
* Crust. in Mission Scientifique du Mexique, p. 256 (1873-80). 
