184 DR. J. G. DE MAN ON THE PODOP HTHALMOUS 
inner surface of the mobile finger is equally marked with a 
longitudinal, elevated, piliferous line. On the under margin of 
the index a small tuft of longer hairs is situated close to the 
tip. 
The ambulatory legs are very characteristic and differ much 
from those of D. sulcata. The legs of the first pair are a little 
longer than the chelipedes, those of the second and third pair 
are again a little longer than the ambulatory legs of the first 
pair, and those of the last pair are about as long as those of 
the first pair. The meropodites of all the legs are enlarged, 
so that, e.g., those of the ambulatory legs of the second and 
third pair are little more than twice as long as broad, whereas 
in D. sulcata these joints are slender. The meropodites of all 
the ambulatory legs are provided with rather large “ tympana,” 
which occupy nearly the whole surface of the joints, those of 
the last pair being only a little smaller*. The meropodites of 
the legs of the first pair are armed at the distal end of the 
upper margin with two or three small acute teeth, those of the 
legs of the second and third pair present a row of small acute 
teeth along the distal half of the upper margin, which gradually 
increase in size towards the distal end; the meropodites of the 
last pair only present one or two small teeth at the distal end of 
the upper margin. The upper margins of the meropodites bear 
a few small hairs, but the under margins of the meropodites 
of the ambulatory legs of the first and second pair are densely 
clothed with many long hairs. The carpopodites and propodites 
of the ambulatory legs are very similar to those of D. sulcata 
as regards their relative length; these joints are slightly hairy, 
but the carpopodites of the legs of the first and second pair pre- 
sent a tuft of hairs on the upper surface close to the articulation 
with the propodites, and the propodites of these legs a similar 
tuft on the upper surface close to the articulation with the car- 
popodites. 
The dactylopodites are very characteristic, for they are a 
* According to Dr. Hilgendorf (Crustacea von Ost-Afrika in Baron vy. d. 
Decken’s Reise, p. 86) the meropodites of the last pair of legs of D. sulcata 
should present no “tympana;” in the two specimens of that species, how- 
ever, which I have before me the meropodites of the last pair of legs are 
provided with very small ovoid “ tympana,” situated in the middle of the 
joints. 
