114 
THE VOYAGE OE H.M.S. CHALLENGER. 
on the dorsal surface of the carapace exactly alike. The colour (in spirit-specimens) 
is the reverse of that mentioned by A. Milne Edwards in his latest description of this 
species, the blotches upon the carapace being of a yellowish hue, and the narrow lines 
defining them of a crimson red, as in the description and figure of Herbst’s Cancer 
spectabilis, which very probably represents Lophactsea lobatus, but as Herbst was ignorant 
of the locality of his types, and both description and figure are very insufficient, I follow 
Professor A. Milne Edwards in retaining for this species the name by which it has been 
generally known. 
The adult male has the following dimensions : — 
Adult $ . 
Lines. 
Millims. 
Length of carapace, ...... 
n 
16 
Breadth of carapace, about ..... 
10* 
22-5 
Lophactsea granulosa , (Rupp ell). 
Xantho granulosus, Riippell, Beschreib. 24 kurzschwanzigen Krabben des rotben Meeres, p. 24, 
pL v. fig. 3, 1830. 
Lophactsea granulosa, A. Milne Edwards, Nouv. Archiv. Mus. Hist. Nat., vol. i. p. 247, 1865 ; 
vol. ix. p. 187, 1873, et synonyma. 
Honolulu, on the reefs (an adult female). 
Adult J . Lines. Millims. 
Length of carapace, . . . . . . . 8J 18 
Breadth of carapace, . . . . . . . 12* 26 
Lophozozymus, A. Milne Edwards. 
Lophozozymus, A. Milne Edwards, Ann. d. Sci. Nat., ser. 4, vol. xx. p. 276, 1863; Ann. Soc. 
Entom. France, ser. 4, vol. vii. p. 272, 1867. 
The carapace is broader than long, lobulated near the antero-lateral margins, 
depressed or moderately convex ; its antero-lateral margins are distinctly dentated, but 
occasionally (subgenus Lophoxanthus) the first and second antero-lateral marginal teeth 
are not developed. The front projects but little, and is divided by a small median notch 
into two broad and truncated lobes. The orbits are nearly circular, and marked with ( 
fissures which are closed, or even obsolete. The post-abdomen in the male is five- to 
seven-jointed (the third to the fifth segments frequently coalescent). The eyes are set on 
lateral process of the front, but does not enter the interior subocular hiatus. The 
exterior maxillipedes are of the normal form, nearly quadrate, and distally truncated, 
with the antero-external angle not produced and the antero-internal angle very slightly , 
(if at all) emarginate ; exognath of moderate width. The chelipedes (in the adult male) 
are moderately developed, with' the merus-joint short, trigonous ; wrist not carinated 
