CRUSTACEA. 209 
more especially of the front, and as regards the sculpture 
of their upper surface, the specimens of Flores fully agree 
with the type specimen of Vienna. 
Our examples show a reddish colour on the upper side, 
a rather light one, on which the elevated lines and striae 
are marked with a darker red, and the violet propodites 
of the ambulatory legs are ornamented with a small white 
spot near the wrists; the under surface, especially that of 
the chelipedes, presents a violet hue. 
The cephalothorax of the largest specimen is 9?/, millim. 
long and 9°/, millim. broad, thus about as broad as long. 
Petrol. barbatus Heller now is represented in the Red Sea 
by Petrol. carinipes Heller (Fig. 5), a species that bears also 
an epibranchial- and a supraocular tooth and 
which presents so great a resemblance to the former that it 
seems desirable to indicate the few differences between the two 
species. Before me lies the specimen of Petrol. carinipes 
Heller from Djeddah that I have described many years ago, 
(Notes from the Leyden Museum, Vol. III, 1881, p. 104), 
a description to which I refer. In the first place the front 
of Petrol, carinipes (Fig. 5a) is comparatively alittle 
broader with more distinct, rounded lateral 
lobes. Then furthermore the carpopodites of the anterior 
legs are a little less slender than those of Petrol. 
barbatus. The posterior margin of these joints is armed 
with four small acute teeth, the distal one of which is 
double, as in Petrol. barbatus, but these teeth extend be- 
yond the middle of the margin and are placed on the 
margin itself, sothat they are more obvious than in the 
indian species. In Petrol. carinipes the carpopodites of the 
first pair of ambulatory legs are not armed with the sharp 
spinule at the anterior margin, which is found in the in- 
dian species, not only in the specimen of Djeddah, but 
also in the type specimen of Heller, as Koelbel writes. 
The posterior margin of the meropodites of the fourth or 
penultimate pair of legs of Petr. carinipes is entire, not 
dentate, and finally, according to Koelbel, the median 
Notes from the Leyden Museum, Vol. XV. 
