136 MR. £. J. MIERS ON CRUSTACEANS [Feb. 20, 
and back of the cardiac region which always characterize O. cera- 
tophthalma. ‘he terminal spines of the eyes in one specimen are 
quite short ; in the other specimen they are longer, but not one third 
of the total length of the eye. Occasionally they are very greatly 
elongated; and evidently their length is of no value as a specific 
character. O. ceratophthalma is a very common and generally 
distributed Indo-Pacific species. 
GRAPSUS STRIGOSUS. 
Cancer strigosus, Herbst, Naturg. der Krabben und Krebse, iii. 
(part 1) p. 55. pl. xlvii. fig. 7 (1799). 
Grapsus strigosus, Latr. Hist. Crust. et Ins. vi. p. 70 (1803); 
M.-Edw. Hist. Nat. Crust. ii. p. 87 (1837); Aun. Sci. Nat. Zool. 
(Sér. 3) xx. p. 169 (1853); A. M.-Edw. Nouv. Archiv. Mus. Hist. 
Nat. ix. p. 286 (1873), wbi synon. 
Two specimens, a male and a female with ova, both in an imper- 
fect condition, are in the collection. M. Alphonse Milne-Edwards 
(7. c.) has excellently summarized the characters which distinguish 
this common and variable species from the closely allied and still 
more common and variable G. pictus, and has indicated the synonymy 
of each species. 
G. strigosus is distributed throughout the Indo-Pacific region, 
and is even (as is also G. pictus) found on the western coast of the 
American continent. 
GRAPSODES NOTATUS. 
Grapsodes notatus, Heller, Reise der Novara, Crust. p. 58, pl. v. 
fig. 2 (1865). 
Three specimens, a young male and two females, are in the col- 
lection, which, I think, belong to this species. Dr. Heller’s speeimens 
were from the Nicobars; both the genus and species are unrepre- 
sented in the collection of the British Museum. The antero-lateral 
margins are described as 3-toothed, as are those of the specimens 
from Duke-of-York Island (including the external orbital tooth) ; 
in the figure of G. notatus there is an additional small antero-lateral 
tooth: this is piobably an error of the draughtsman. As in the 
allied genus Nectograpsus, there is a wide hiatus between the outer 
orbital tooth and the suborbital lobe; this is mentioned in Dr. Heller’s 
description, but not properly represented in the figure. Dr. Heller’s 
genus Grapsodes is evidently very nearly allied to Nectograpsus of 
the same author, principally differing in the existence of antero-lateral 
marginal teeth. The two genera, in fact, bear the same relation to 
one another in the subfamily Sesarminze as do certain species of 
Chasmagnathus to Cyclograpsus in the Grapsine. 
SESARMA ROTUNDATA. 
Sesarma rotundata, Hess, Archiv. f. Naturg. xxxi. p. 149, pl. vi. 
fig. 9 (1865). 
Three specimens of this species, all of them males, are in the 
collection. §S. rotundata belongs to the section of the genus in 
