132 DR. J. G. DE MAN ON THE PODOPHTHALMOUS 
separated from one another, are covered with minute tubercles 
or granules. 
As regards the inflected regions of the carapace, D. brevitarsis 
much resembles D. sulcata, the pterygostomian and subhepatic 
regions being sulcate, whereas the posterior or subbranchial 
portions of the under surface are not grooved, but covered with 
short cilia; the grooves of the pterygostomian and subhepatic 
regions are, however, in D. brevitarsis a little more numerous and 
narrower. Furthermore, on the posterior portion of the under 
surface a row of cilia occurs, proceeding from the anterior part of 
the lateral margin of the upper surface to the base of the fourth 
pair of legs. 
The outer foot-jaws (fig. 3) also closely resemble those of 
D.sulcata; the merus-joint is larger than the ischium-joint, which 
is quite smooth; both joints are separated by an almost transverse 
suture. The merus-joint presents four longitudinal narrow 
grooves, arranged in such a manner that the elevated parts, which 
separate the grooves from one another, constitute a W-like figure, 
the opening of which is directed forward. As on the upper surface 
of the cephalothorax, the elevated ridges on the merus-joint of 
the maxillipedes and on the subhepatic and pterygostomian regions 
are covered with small granules. The sternum is smooth, and 
does not present the ovoid membranaceous plates which are 
characteristic of D. fenestrata. The abdomen of the male, 
however, has a characteristic form and differs much from that 
of D. sulcata. The terminal or first joint is triangular, being as 
long as broad at the base and rounded at the tip ; the second is 
as long as the terminal joint, scarcely broader than long, and with 
somewhat arcuate lateral margins ; the third joint is nearly as 
long as the second and about as broad as long, presenting a small 
contraction close to the posterior margin ; the fourth joint is only 
half as long as the second, but is remarkably enlarged on each 
side and narrowed again posteriorly, thus forming a rounded 
lobe on each side; the fifth jomt is a little shorter than the 
fourth and is also dilated on each side, though not so much as 
the fourth joit; the sixth somite is shorter than the fifth, 
scarcely enlarged, so that it is three times as broad on its anterior 
margin as it is long; the seventh or basal joint is a little 
longer than the sixth, and provided with a transverse elevated 
crest. The lateral margins of the abdomen are fringed with long 
hairs. 
