382 Mr. E. J. Miers on Ocypoda. 
(Major MacDonald), and others without special indication of 
locality. 
Two much mutilated specimens from the Red Sea, desig- 
nated by White O. Fabrici, are doubtless a less mature 
condition of this species, from adult examples of which they 
are only distinguished by their smaller size, the less obtuse 
angles of the carapace, and by the very short ocular styles 
(which now only exist in one specimen). 
I have seen no specimens which I can refer with certainty 
to the Ocypoda Fabricit as characterized by Kingsley, which 
in the structure of the stridulating-ridge somewhat resembles 
O. platytarsis and also O. ceratophthalma, as described by 
the American author. May it not be the young of the latter 
species ? 
5. Ocypoda rotundata, sp.n. (Pl. XVII. figs. 4, 4 @.) 
I am obliged thus to designate an adult male of very large 
size (length of carapace 2;'5 inches, 53 millim.; greatest 
breadth 24 inches, nearly 60 millim.), in which the carapace 
is very coarsely granulated, the granules much less crowded 
than in O. ceratophthalma and O. egyptiaca, with the exte- 
rior orbital angles very broadly rounded, so that the antero- 
lateral margins of the carapace sweep round in a continuous 
curve to the upper margin of the orbits, which curve is only 
slightly interrupted by a shallow notch at the point occupied 
by the projecting angle of the orbit in O. ceratophthalma. 
The terminal styles of the eye-peduncles are short, straight, 
not reaching to the lateral margins of the carapace. There 
are scarcely any indications of the upper part of the stridula- 
ting-ridge on the inner surface of the palm of the larger cheli- 
pede; the lower part of the stridulating-ridge is composed of 
a series of widely-separated secondary ridges; the palm itself 
is very massive, with a few scattered granules on its outer 
surface; the margins both of arm, wrist, and chela are armed 
with spinules or small tubercles; the merus joints of the 
ambulatory legs are armed with a strong tooth or spine at the 
distal ends of their upper margins; there exists, as in O. 
egyptiaca, a patch of hair on the inferior surface of the pe- 
nultimate joint of the second legs only. 
The specimen, which is much mutilated, is labelled “ Duk- 
hun, Col. Sykes” (coll. India Museum), and was probably 
obtained at some locality on the western coast of India. 
The form of the carapace and of the stridulating-ridge serve 
to distinguish it from any specimen of the genus in the Mu- 
seum collection ; but upon the whole it most nearly resembles 
O. egyptiaca, and the distinctions may possibly be either ab- 
