REPORT ON THE BRACHYURA. 
259 
The specimens collected show considerable variation in the 
coloration 
and markin 
of the carapace. 
Adult $ . 
Lines. 
Millims. 
Length of carapace, about ...... 
10J 
22-5 
Breadth of carapace, nearly ...... 
13 
27 
Pachygrapsus, Ranclall. 
Pachygrapsus, Randall, Journ. Acad. Nat. Sci. Philad., vol. viii. p. 126, 1839. 
„ Milne Edwards, Ann. d. Sci. Nat., ser. 3, Zool., vol. xx. p. 166, 1853. 
,, Kingsley (pt.), Proc. Acad. Nat. Sci. Philad., p. 198, 1880. 
This genus in all of its characters is very nearly allied to Metopograpsus, but is 
distinguished by the somewhat more convex carapace, which is usually very distinctly 
plicated over the whole of the dorsal surface, and by the lesser development of the interior 
subocular lobe of the orbit, which does not reach the front, so that the produced antero- 
external lobe of the basal antennal joint usually enters slightly within the orbital hiatus. 
The species are widely distributed over the warmer, temperate, and tropical shores 
and islands, both of the Indo-Pacific and Atlantic regions. The single species occurring 
in the Challenger collection has (as the specimens collected show) a very extended 
geographical range. For further details upon the distribution of this genus I may refer 
to Mr. Kingsley’s memoir. 1 
Pachygrapsus transversus, Gibbes. 
Pachygrapsus transversus, Gibbes, Proc. Amer. Assoc. Adv. Sci., p. 181, 1850. 
,, „ Kingsley, Proc. Acad. Nat. Sci. Philad., p. 199, 1880, where 
references to synonyma. 
Goniograpsus innotatus, Dana, Proc. Acad. Nat. Sci. Philad., p. 249, 1851; U.S. Explor. Exped., 
voL xiii., Crust., p. 345, pi. xxi. fig. 9, 1852. 
Bermuda, on the shore (an adult male and two females) ; St. Vincent, Cape Verde 
Islands, July 1873 (four males, of which two are adult, and a young female); Australia, 
Port Jackson, Sow and Pig’s Bank, in 6 fathoms (an adult male). 
I can see no distinctions of specific importance in the specimens from these widely- 
distant localities. 2 
1 I would suggest here, that the genus Goniograpsus, Dana, which is not retained as distinct either by Stimpson or 
Kingsley, may be conveniently restricted to and used as a generic designation for the Mediterranean Pachygrapsus 
marmoratus, and (probably) the Chilian Pachygrapsus pubescens, Heller, and Pachygrapsus latipes, in which the 
carapace has two teeth behind the tooth at the exterior orbital angle. Goniograpsus marmoratus, which is the only one 
of these species I have examined, is further distinguished from the typical Pachygrapsi by the nearly horizontal front 
and smoother quadrate carapace. 
3 It is very probable that this species may be identical with the earlier described Pachygrapsus maurus (Lucas), 
from the Mediterranean, but as I have examined no Mediterranean examples of the genus, I do not venture to unite 
the two forms. Of the numerous synonymical citations admitted by Kingsley, there are one or two which I have not 
personally verified. 
