1926] Schmitt, Crustaceans Collected by. the Congo Expedition 39 
fingers in the adult specimens vary from two-thirds to three-fourths the 
length of the palm and the largest tooth on the movable finger is almost 
as long as the width of the adjacent part of the finger. _ 
In several of the Liberian specimens reported on by Miss Rathbun, 
none of which have the adult or fully mature characters at all well 
developed as compared to the largest Congo specimens before me, the 
rostrum, though surpassing the antennular peduncle, scarcely reaches 
the tip of the spine of the antennal scale; the post-rostral carina runs 
back as in the younger Congo specimens, reaching in some specimens 
about as far behind the first rostral tooth as the fourth is before it; the 
third maxillipeds exceed the antennular peduncle by the length of their 
terminal joint and often by a part of the penultimate joint as well; the 
fingers of the second legs are a little shorter than the palm (about five- 
sixths its length) and the carpus is more than twice as long as wide. 
However, these characters can all be so more or less closely approximated 
in one or another of the Congo specimens, especially the smaller or 
younger ones. The Liberian material, at least that which I have ex- 
amined, is specifically identical with that of the Congo. 
With respect to the relative slenderness of the third pair of legs also 
stressed by de Man (loc. cit., 1912, p. 242) as distinguishing his variety 
herklotsii from M. vollenhovenii, it appears in our largest Congo male, 
which is about the size of the two males de Man compared, that the 
measurements of these legs are intermediate between them, except for 
the dactyls which are longer than either. None of the Congo specimens 
has the legs quite as in the measured herklots¢i specimen, but in the larger 
and better developed males recorded by Benedict from the Kuanza 
River at Cunga, the third legs have just about the proportions of herk- 
lotsiz. The relative length of the fifth pair of legs as given for the variety 
herklotsti also fits our Congo specimens, though often the fifth pair 
reaches a little beyond the antennular peduncle; in the one ovigerous 
female the fifth legs attain only the distal end of the second segment of 
the peduncle. De Man’s statement regarding the large male of M. vollen- 
hovenit (loc. cit., 1912, p. 43), ‘legs of the third pair, extended, reach 
beyond the scaphocerites by their terminal article,” would give them, it 
seems, about the same relative length as in the variety herklotsv. 
An inspection of the tabular summary of the measurements of 
several of the specimens examined together with those presented by de 
Man, seems to bring out that the differences between M. vollenhovenia 
and M. jamaicense var. herklotsiz are of no greater magnitude than 
admitted by the range of variation that can be considered normal to the 
species. The measurements of the two specimens of M. jamaicense 
have been included as a matter of record only. 
