1926] Schmitt, Crustaceans Collected by the Congo Expedition ol 
usually as long, and only occasionally longer, and this may be by almost 
one-sixth its length. As de Man described its shape: “The rostral crest 
(fig. 3 and 3a) which arises just in front of the middle of the carapace, 
is directed rather strongly upward to the level of the posterior border of 
the cornea, extends forward and then bends downward almost to the 
distal extremity of the antennular peduncles ; the distal portion is always 
more or less distinctly upturned. The result of the direction of the rostral 
crest is, that the rostrum appears rather strongly convex above the eyes, 
extending forward and that at this level the part situated above the very 
wide lateral crest appears much higher than the portion situated below, . 
which is almost nzl because the teeth are placed almost directly onthe crest.” 
His figure hardly shows the dorsal or upper blade of the rostrum as 
it appears. This high upper blade, together with the slender, non- 
crested (without dorsal blade), upturned terminal portion is so distinc- 
tive in this species, that as a distinguishing character, it is almost next in 
importance to the proportions of the second legs. Usually two of the 
dorsal teeth are on the carapace, less often is the second far enough in 
front of being over the orbital margin, that one can truly say there is but 
one on the carapace. The last of the dorsal teeth is “apical” or rather 
subapical, and the penultimate tooth is almost always far enough re- 
moved from the ante-penultimate to be considered as a second ‘‘apical”’ 
tooth, being as a rule farther from the ante-penultimate than this is 
from its predecessor, or in fact than any of the other teeth are from each 
other except possibly the first from the second. The dorsal teeth may 
be as many as eleven, as in our one male from Aba. I know of none with 
less than nine, the usual number being nine or ten; of these one or two 
are on the carapace while below there may be from four to seven, with 
four or five of commoner occurrence. 
The position of the hepatic spine with respect to the first rostral 
tooth seems to be of little consequence. It may be directly under that 
tooth, before or behind it. In our largest male it is directly under the 
first rostral tooth, in the measured immature and smallest males and in 
the Aba specimen it is before the first tooth, and in the smallest measured 
female behind it. The proportions of the telson approximate those given 
by de Man; the dorsal spines are situated far behind, but are readily 
discernible, furnishing in lieu of other characters a means of distinguish- 
ing this species from M. foazi (Coutiére) (ef. de Man, loc. cat., 1912, p. 
paler , 
The mature males differ from the immature males and females of /. 
lujexe by characters comparable to those found in M. dux below, the fingers 
