REPORT ON THE BRACHYTTRA. 
115 
above, but toothed on the inner margin ; palm slightly compressed and often carinated 
above ; fingers toothed on the inner margins. The ambulatory legs are of moderate 
length, compressed, with the merus, carpus, and penultimate joint carinated on the, 
superior margins. 
The species are widely distributed throughout the Oriental region, and occur also on 
the Californian coasts, and except the type Lophozozymus epheliticus (Linn.), are of 
rather small size. I have described a species, Lophozozymus ( Lophoxanthus ) sexdentatus, 
from the Senegambian coast. 
The single species in the Challenger collection is to be referred to the subgenus 
Lophoxanthus / which is apparently distinguished from the typical Lophozozymus merely 
by the less transverse and generally more depressed carapace, and by the obsolescence of 
the first and second teeth of the antero-lateral margins, and passes by almost insensible 
gradations into the typical form, and to which the following species and varieties have 
been referred : — 
Lophoxanthus lamellipes (Stimpson). California and West Coast of Mexico. 
Lophoxanthus hellus (Stimpson ) = Xanthodes leucomanus, Lockington, and 
Xantliodes hemphilli, Lockington (vars.). California and Japan (50 fathoms). 
Lophoxanthus sexdentatus, Miers. Goree Island, Senegambia (9 to 15 fathoms). 
Lophozozymus ( Lophoxanthus ) bellus, Stimpson, var. leucomanus, Lockington (PI. XI. 
fig. 1). 
Xantliodes leucomanus, Lockington, Proc. Calif. Acad. Nat. Sci., pp. 32, 100, 1876. 
The carapace is transverse, nearly flat and plane, except behind the front and the 
first antero-lateral marginal teeth, where it is rugose and granulated ; the rugosities 
exist also on the front of the gastric and branchial regions ; the cervical suture and the 
sutures of the frontal, gastric and branchial regions are distinct ; the frontal margin is 
nearly straight, with a median notch. Of the antero-lateral teeth, only the three posterior 
are distinctly developed ; these are triangulate and moderately prominent ; in front of 
the first of these is the rudiment of another tooth. The pterygostomian regions are 
granulated ; the sternal surface is nearly smooth. Only five of the post- abdominal 
segments are distinct (the third and fourth, and the fifth and sixth, are coalescent), the 
terminal segment is slightly transverse and distally rounded. The basal antennal joint 
reaches to the infero-lateral frontal process, but not to the apex of the inner subocular 
angle of the orbit. The outer maxillipedes present nothing remarkable ; their narrow 
exognath reaches to the antero- external angle of the distally truncated merus-joint. 
The chelipedes are moderately large and robust (either the right or left is the larger). 
The upper margins of their short and trigonous merus-joints are armed with a series of 
1 Lophoxanthus, A. Milne Edwards (genus), Crust, in Miss. Sci. au Mexique, pt. 5, p. 256, 1879. 
