CRUSTACEA OF THE MERGUI ARCHIPELAGO. 257 
racters it forms a remarkable transition between the two hitherto 
known species of the genus Grebiopsis, viz. G. nitida, A. M.-Edw.> 
from the Cape Verde Islands, and G'. Darwinii, Miers, from the 
seas of Australia*. 
This new species may be distinguished from Gt. Darwinii, (1) 
by the comparatively longer peduncles of the internal and external 
antenne, (2) by the meropodites of the chelipedes being armed 
with a row of minute, acute spinules along their infero-internal 
margins, (8) by the carpopodites of the chelipedes being armed 
with two strong spines, and (4) by the shape of the last pair of 
ambulatory legs, which more resemble those of a true G'ebia. 
G. intermedia may be seen at first sight to differ from G. nitida 
by the much shorter peduncles of the internal and external 
antenne, and by many other characters. In its general appear- 
ance, however, it much resembles that species, not only as regards 
the body, but also im the shape and the structure of its legs, 
which is seen on comparing it with the figure of that species 
im the ‘ Nouvelles Archives.’ The front is very short, horizontal, 
not at all deflexed, and projects but little beyond the short thick 
eye-peduncles, of which only the cornee are visible when seen 
from above. The front is armed with four equidistant, short, 
equal, and acute spinules on its anterior margin. The front 
and the larger anterior half of the gastric region are densely 
eovered with tufts of short hairs, between which they are 
armed with many acute spinules and granules; the lateral 
margins of the gastric region are also armed on each side 
with a row of 14-15 small acute teeth, which gradually increase 
in size anteriorly, so that the anterior teeth are much larger 
_than the posterior. The cervical suture is broad and deep, and, 
on each side, the gastric region is bordered by a rather deep 
longitudinal groove, immediately below and parallel to the 
rows of small teeth which issue posteriorly into the cervical 
suture. Behind the cervical suture the dorsal surface of the 
carapace is smooth in the middle and a little rugose on the 
sides; its posterior margin is fringed with short hairs. The 
segments of the postabdomen are smooth, but somewhat hairy 
* Miers (Zoology of the Voyage of H.M.S. ‘ Alert ’) mentions another species 
from the Australian seas, which he proposes to designate Gebiopsis Bowerbankit, 
if specifically distinct ; this form, however, seems only to differ from G. Dar- 
winii in the armature of the front. 
LINN. JOURN.—ZOOLOGY, VOL. XXII. 17 
