378 MEMOIRS OF THE CAKNEGIE MUSEUM 



Abdomen as long as carapace, or slightl}' 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 senii-elliptical, distinctly wider than 

 long, slightly shorter than anterior section. 



Episfoma 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 consti'icted at 

 the base, semi-circular, with a median anterior point. This point may be strongly 

 developed, or almost entii'ely absent. Transverse diameter distinctly greater than 

 the longitudinal. 



Antciiinila with a small, often spiniform, tubercle on the lower margin of the 

 basal joint. 



Anfctinal pedunde with a tubercle on the outer side of the first joint, which is 

 often spiniform, chiefly so in young specimens ; second joint with or without a very 

 indistinct tubercle. 



Anteniial scale short and narnjw, slightly longer than the rostrum, reaching to, 

 or almost to, the end of the fourth joint of the antenna! peduncle. Spine of outer 

 margin strong. Laminar part not much broader than the marginal spine. 



FhtgeUum reaching to the anterior mai'gin or to the middle of the telson in the 

 male, slightly shorter in the female, but sometimes considerably shoi'ter, without 

 apparent trace of having been injured. In some cases it reaches only the middle of 

 the second abdomiiaal segment. 



First pereiopods (V\i\te XL, Fig. 2) very strong and rolmst 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 moi-e 

 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 tul)ercles, larger in the proximal part. Upper 

 surface of each finger with a low longitudinal rib, boi'dered by rows of pvinctures. 

 This rib often becomes indistinct, especiall_y on the movable finger in old males. 



Ciirpopodite slightly longer than wide, shorter tlian palm, with a deep longitud- 

 inal sulcus above. Inner margin with a strong pointed or Idunt spine, which is 

 generally distinctly hooked, going off almost at a right angle, l)ut curving foi'ward 

 in the distal part. A small spine or tubercle (sometimes double) may be added to 



