38 Bulletin American Museum of Natural History [Vol. LIII 
Malela, July 8, 1915, 907, 19, 1 juvenile; July 1915, 607, 1° 
(ovigerous). 
These specimens approximate more nearly de Man’s (loc. czt., 1912) 
elaborated description of M. vollenhovenii (Herklots) than that of the 
variety herklotsii, which name he (loc. cit.) has given to certain specimens: 
one from the Congo and others from Liberia and the River Prah, Ashanti, 
that he thought represented the American M. jamaicense on the west 
coast of Africa. 
On the basis of de Man’s remarks and the series of specimens before 
me I believe his new variety to be one of the extremes of variation of the 
species M. vollenhoveniit. In many respects our Congo specimens are 
intermediate between these two forms, which he considered distinct. 
M. jamaicense cannot well enter into any discussion of African 
forms. It is quite distinct: the carpus of the second legs is very short 
and stout, being in younger specimens about twice as long as broad, and 
in older searcely that and often less, and always shorter than the merus, 
varying with age from about two-thirds to about five-sixths of the meral 
length. The rostrum is usually shorter than the antennular peduncle, and 
never, so far as I have been able to ascertain, does it reach as far as the 
spine of the antennal scale; the post-rostral carina begins some distance 
behind the first rostral tooth, usually as far back of the first tooth as this 
is removed from the sixth or seventh in front of it. The third maxillipeds 
may exceed the antennular peduncle by as much as the length of the 
terminal joint, or a little more, but I have seen no specimens in which 
they reach to the end of the antennal scale or beyond it. The fingers of 
the second legs are about as long as the palm, or nearly so, and the length 
of the largest tooth on the fingers is not more than two-thirds the width 
of the adjacent part of the finger in the rare, very large specimens, usually 
it is rather insignificant compared to the finger width in most specimens 
taken. | 
In our Congo specimens the carpus is easily two and one-half or 
more times as long as its distal width and the carpal and meral joints 
are subequal; the rostrum always surpasses the antennular peduncle 
and reaches at least about to the tip of the spine of the antennal scale, 
and often as far as the blade; in older specimens the first rostral tooth 
rises out ofthe dorsum of the carapace, in younger specimens there is 
- more or less of a carina running.as far back of the first tooth as the second 
or third is in front of it. The third maxillipeds exceed the antennular 
peduncle by their terminal joint—this character, by the way, I find 
of no great assistance in distinguishing the species here discussed. The 
