Mr. i. J. Miers on Ocypoda. 387 
Ae where it is absent, as well as the stridulating-ridge 
itseil. 
Were it not for the locality of O. africana, I should have 
supposed this form to be a mere variety of O. Kuhlit, with 
which M. De Man does not even compare it. 
With this species the Ocypoda hexagonura of Hilgendorf*, 
which also inhabits the coasts of Loango, Liberia, and Rufis- 
que, is probably identical; in the specimens described by 
Hilgendorf the strie of the stridulating-ridge pass into small 
tubercles in the upper portion; the penultimate joint of the 
ambulatory legs is hairy only on its distal parts. 
11. Ocypoda cordimana, Desmarest. 
(Pl. XVII. figs. 9,9 a). 
Specimens are in the British-Museum collection from the 
Mauritius, Rodriguez (H. H. Slater); Seychelles, Amirante, 
and Providence Islands (Dr. Coppinger, H.M.S. ‘ Alert’) ; 
Indian Seas, Ceylon (Z. W. H. Holdsworth) ; Koo Keang 
“San (4.1.8. ‘Samarang’); Borneo, Fiji Islands, Ovalau, 
Totoya (H.M.S. ‘Herald’); New Hebrides (Mr. MacGilli- 
vray); and others without special locality. 
This species, as De Man has shown, is at once distinguish- 
able from O. Kuhlit by the absence of a stridulating-ridge 
from the inner surface of the palm of the larger chelipede in 
both sexes. The carapace is quadrate, very slightly trans- 
verse and very convex, and is somewhat more coarsely granu- 
lated toward the sides than on the gastric and cardiac regions. 
The antero-lateral angle is acute and moderately prominent. 
The chelipedes are less elongated and usually more finely 
granulated than in O. Kuhlit; and the under surfaces of the 
penultimate joints of the second and third ambulatory legs 
are usually provided with a fringe of short thick hairs. 
In the report on the Crustacea collected by the T'ransit-of- 
Venus expedition at Rodriguez t+ I confounded under the 
designation O. cordimana specimens both of this species and 
- O. Kuhliz. The distinctive characters of the two species 
. were indeed never known until indicated by Dr. De Man. 
EXPLANATION OF PLATE XVII, 
e*» The figures (unless otherwise noted) represent the exterior orbital 
angle and. the stridulating-ridge on the inner surface of the palm of the 
larger chelipede in each species, and are drawn, of the natural size, from 
* Sitz. Gesellsch. naturforsch, Freunde zu Berlin, 1882, p, 23, 
. ¥ Phil, Trans. clxviii. p, 489 (1879). ae 
