386 Mr. E. J. Miers on Ocypoda. 
St. Lucas, as probably a variety of this species. Three speci- 
mens are in the British-Museum collection from Cape St. 
Lucas (Smithsonian Institution). They are distinguished 
from O. arenarta by being destitute of the long hair from the 
margins of the ambulatory legs, whose penultimate joints are 
less dilated than in O. arenaria, and by having the carapace 
very evenly granulated over the whole of its dorsal surface. 
This latter character will also distinguish this variety from 
the typical condition of O. Kuhlii; yet, in the specimen from 
Madagascar above referred to, the granulations of the carapace 
are as even and regular as in the Californian examples. The 
penultimate joits of the ambulatory legs are smoother below 
and more thickly clothed with short thick lines than in adult 
Australian examples of O. Kuhlii; but a specimen from the 
New Hebrides resembles Stimpson’s variety in these parti- 
culars. ‘To illustrate the very different character of the hairs 
which clothe the ambulatory limbs in the two species, I have 
figured (fig. 8 6) the under surface of the first ambulatory leg 
of one of the specimens designated O. occ¢dentalis in the Mu- 
seum collection, and probably named by Dr. Stimpson, with 
which may be compared the drawing of the same limb of O. 
arenarta from one of Say’s Georgian specimens (fig. 7 6). 
If (of which there is no evidence in the Museum collection) 
intermediate conditions occur connecting O. Kuhlit and O. 
africana with O. arenaria, the latter name, having priority, 
would have to be used for the species, which would have an 
almost cosmopolitan distribution throughout the warmer tem- 
perate and tropical seas of the globe. 
10. Ocypoda africana, De Man. 
I have seen no specimens of this species, which inhabits 
the West-African coast (Liberia to the Congo), and is de- 
scribed by M. De Man as very nearly allied to O. cordimana, — 
but differmg in the possession of a stridulating-ridge, in which 
it is allied to O. Kuhlitz, typical specimens of which it further 
resembles in having the under surface of the penultimate 
joints of the second and third legs devoid of patches of hairs. 
It is distinguished from typical specimens of O. Kuhlit prin- 
cipally, it would seem, by the more evenly granulated carapace 
and the striated (not tuberculated) stridulating-ridge; but 
I have observed specimens of O. Kuhlit which approach it 
in both these particulars. 
The linear tubercle of the ischium joint of the larger cheli- 
pede, specially mentioned by De Man, against which the 
stridulating-ridge impinges, exists more or less distinctly in 
all the species of Ocypoda I have examined except O. cordt- 
