378 MEMOIRS OF THE CARNEGIE MUSEUM 
Abdomen as long as carapace, or slightly shorter or longer; it is slightly wider in 
the female than in the male, but hardly wider than the carapace in the former. 
Anterior section of telson on the posterior lateral corners generally with two, more 
rarely with three spines. Posterior section semi-elliptical, distinctly wider than 
long, slightly shorter than anterior section. 
Epistoma with posterior part broad and short, about two and a half times as 
broad as long, with a distinct transverse groove on either side slightly posterior to 
the middle, and an anterior median depression. Anterior section constricted at 
the base, semi-circular, with a median anterior point. This point may be strongly 
developed, or almost entirely absent. Transverse diameter distinctly greater than 
the longitudinal. 
Antennula with a small, often spiniform, tubercle on the lower margin of the 
basal joint. 
Antennal peduncle with a tubercle on the outer side of the first jot, which is 
often spiniform, chiefly so in young specimens; second joint with or without a very 
indistinct tubercle. 
Antennal scale short and narrow, slightly longer than the rostrum, reaching to, 
or almost to, the end of the fourth joint of the antennal peduncle. Spine of outer 
margin strong. Laminar part not much broader than the marginal spine. 
Flagellum reaching to the anterior margin or to the middle of the telson in the 
male, slightly shorter in the female, but sometimes considerably shorter, without 
apparent trace of having been injured. In some cases it reaches only the middle of 
the second abdominal segment. 
First pereiopods (Plate XL, Fig. 2) very strong and robust in old individuals, 
particularly males. Hand elongate-ovate, broad, and strongly depressed. Surface 
punctate. Inner margin of palm short, curved, with a single marginal row of more 
or less distinct, low tubercles. Outer margin smooth, rounded proximally, carinate 
distally. Fingers longer than palm, not gaping in young individuals, but with a 
wide gap at the base, meeting only at the tips, most noticeably in old males. 
Outer margin of movable finger punctate, or, in older specimens, with a few indis- 
tinct tubercles. Cutting edges with tubercles, larger in the proximal part. Upper 
surface of each finger with a low longitudinal rib, bordered by rows of punctures. 
This rib often becomes indistinct, especially on the movable finger in old males. 
Carpopodite slightly longer than wide, shorter than palm, with a deep longitud- 
inal sulcus above. Inner margin with a strong pointed or blunt spine, which is 
generally distinctly hooked, going off almost at a right angle, but curving forward 
in the distal part. A small spine or tubercle (sometimes double) may be added to 
