188 DR. J. G@. DE MAN ON THE PODOPHTHALMOUS 
the shape of the cephalothorax, which is not globose, but rather 
depressed and distinctly broader than long. In other respects 
Dioxippe appears most closely allied to Dotilla and Scopimera, 
especially to the former. The external maxillipeds much re- 
semble those of Dotzila, differing from those of Scopimera. They 
meet along their inner margins; the quadrangular ischium- 
joint is a little broader than long, and presents on its smooth 
outer surface a transverse arcuate piliferous line proceeding 
from the middle of the external margin towards the internal half 
of the anterior margin. The commissure between this joint and 
the merus-joint is transverse. The merus-joint is a little longer 
than the ischium-joint, and has the same form as in the genus 
Dotilla; but it presents only a single longitudinal groove quite 
near the external margin, without any trace of the grooves that 
characterize most species of Dotilla. The anterior margin 1s 
very narrow and slightly concave, and bears the palpus near the 
external angle. The cephalothorax does not present the singular 
erooves of the genus Dotilla. The front is narrow, the orbits 
more or less oblique and elongate ; their inferior margin is very 
prominent, its external angle even constituting a prominent obtuse 
triangular lobe in Dioxippe orientalis. The meropodites of the 
ambulatory legs present more or less distinct traces of the sin- 
gular “tympana” which are so much developed in Dotilla, and 
still more in Scopimera. 
I thus retain the genus Cleistostoma for de Haan’s Cleisto- 
stoma dilatata. 
As regards C. tridentata, A. Milne-Edw., from Upolu, I do 
not venture to decide whether this species ought to be referred 
to Cleistostoma as restricted by me or not. 
80. DIOXIPPE ORIENTALIS, n. sp. (PI. IX. figs. 8-10.) 
Seventeen specimens were collected in the Mergui Archipelago ; 
all are males, except one single ova-bearing female. 
Dioxippe orientalis is probably somewhat allied to Scopimera 
inflata, A. M.-Edw., from the Indian seas (‘ Journal des Museum 
Goddefroy,’ Heft iv. 1878, p. 7); but this form is certainly dif- 
ferent, because the anterior legs are described as being minutely 
granular, and the absence of the “tympana” is not mentioned 
by the learned author. Our Déowippe is of small size, like the 
species of Dotilla and Scopimera, and resembles to a certain ex- 
tent some of the species of Helacius, e. g. H. inornatus, Dana. 
