370 MEMOIRS OF THE CARNEGIE MUSEUM 
The abdomen, epistoma, antennula, and antenna are also similar to those of C. 
propinquus. 
The first pereiopods (Plate XL, Fig. 1) are generally more robust than in C. pro- 
pinquus, particularly in adult males. Hand wider and more distinctly depressed. 
The fingers more widely gaping in old males, and the S-shaped curve of the movable 
finger more pronounced ; in old females there is also a slight gap at the base of the 
fingers. The upper surface of the hand possesses, particularly in large specimens, 
asmall number of scattered low tubercles near the inner margin, and very often 
(but not always) there is a row of 3-5 tubercles running toward the base of the 
movable finger, parallel to the inner margin. ‘'Tubercles of the outer margin of the 
dactylopodite more pronounced. The sculpture of the hand is rather variable, and 
most distinctly developed in old males. ‘The shape of the hand is rather different 
in the male and female; in the female the fingers are shorter, less gaping (or not at 
all), rendering the outline of the hand more regularly ovate. (See Plate A, Figs. 
1 and 2.) 
The carpopodite differs from that of C. propinquus in the development of a 
strong tubercle on the anterior margin of the lower side. This tubercle very rarely 
is indistinct (chiefly so in regenerated claws) ; generally it ends in a distinct, stout, 
conical spine. On the inner margin and on the upper face additional low tubercles 
are not infrequently found. 
The meropodite differs from that of C. propinquus by the constant presence of a 
series of 4-8 small tubercles, or teeth, behind the distal spine on the inner lower 
margin. These teeth are never wanting in any of my specimens. The outer lower 
margin has one or two spines. ‘The latter number is comparatively rare. In re- 
generated claws very often there is no spine at all on the inner lower margin. 
The other characters of the pereiopods are similar to those of C. propinquus. 
The first pleopods of male of the first form (Plate XX XIX, Figs. 7a and 7b) are 
of the general type of those of C. propinquus, but slightly longer, reaching to the 
anterior margin of the coxopodites of the third pereiopods. The inner part does 
not gradually taper to the tip, but is of nearly uniform thickness, with the tip 
rounded off and slightly compressed in the antero-posterior direction. Sometimes 
the tip is even slightly thickened. The anterior margin of this organ, at a point 
somewhat below the separation of the two parts, has a rather sharp, well marked 
shoulder, which is absent in none of the specimens at hand (several hundred). 
In the male of the second form (Plate XX XIX, Fig. 7c) this shoulder is missing, 
and the inner part is blunt, similar in shape to the male of the first form, and not 
tapering to a point as in the typical C. propinquus. 
