1926] Schmitt, Crustaceans Collected by the Congo Expedition 30 
de Man’s descriptions of the species. The largest of the three mature 
males taken at Avakubi in December, 1913 (PI. V, fig. 1) has a rostrum 
of much the typical shape, with downwand and then distally up-curved 
midrib, seemingly a little more so than in Lenz’s figure of the type (loc. 
—cit., 1910, Pl. m1, fig. 2); of the ten dorsal rostral teeth of this specimen, 
the last one in subapical, being placed at three-fourths the distance 
from the penultimate tooth to the tip; the rostrum reaches as far as the 
end of the antennal scale. The largest of the immature males (Pl. VI, 
fig. 1, lower figure), from this same lot of Avakubi specimens has the 
rostrum as long as in the largest mature male, reaching about to the end 
of the blade of the scale. | 
_ Inthe largest female (PI. VI, fig. 1, upper figure), the rostrum reaches 
slightly beyond the spine of the antennal scale, none of the seven dorsal 
teeth is placed far enough forward as to be called subapical, of the two 
on the carapace the anterior is immediately behind the orbital margin; 
the second legs are subequal and, as seems to be usual with the females 
and immature males, the fingers of the chelz of these legs are about 
subequal. In the older, fully developed males, there is often consider- 
able difference in the lengths of the two fingers, and they may be also 
more or less twisted. The ischial and meral joints of the second legs are 
nearly always of the same, or nearly the same, size on the two sides of 
the body. To a lesser degree, this is also true of the carpal joints, the 
differences in size and proportions between the right and left second legs 
being confined almost wholly to the relative development of the palm 
and fingers. 
The most fully devdonsd male (Pl. IV, fig. 2), one of four from 
Niapu, collected November, 1913, has the last ventral rostral tooth Just 
beneath the acuminate tip; being subequal in size to the terminal por- 
tion of the rostrum, and reaching just as far forward, it gives the rostrum 
an abnormally bifid tip, surely the result of a repaired injury, as the 
rostrum scarcely exceeds the antennular peduncle. In one or two other 
mature males of this lot with undamaged rostra the rostrum exceeds the 
spine of the scale, while the other attains almost the end of the scale. 
Both of these specimens have eight teeth above; one three below and the 
other four. 
The one male (PI. V, fig. 2) from the preceding Niapu lot with the 
extreme tip of the rostrum wanting is immature and has the legs of the 
second pair of the lenzii type. The spinulation of the second legs, both 
adult and immature, is much as has been carefully described by de Man; 
below in this immature specimen the spines on the inner margin form 
