208 BULLETIN 152, UNITED STATES NATIONAL MUSEUM 



Description. — Male. — Carapace smooth, bare, strongly areolated, 

 the highest elevations occupying the protogastric and mid-branchial 

 regions. Surface composed of fine close-set granules. Antero- 

 lateral margin with 9 flat, broadly triangular, not strongly produced, 

 subequal teeth with granulate margins; last 2 or 3 teeth acute or 

 sharp-pointed. On postero-lateral margin a blunt tooth formed by a 

 distinct emargination and followed by one and sometimes two less 

 dio^mct. The frontal teeth between the antennae subtriangular, 

 blunt or subtruncate, the middle one narrower and more produced 

 than the next pair. Inner tooth of orbit very broad, shallow, separated 

 from the outer tooth by a small, slightly projecting tooth or lobe. 

 Tooth of basal antennal article broad, oblong; adjacent orbital tooth 

 about half as long. Merus of cheliped armed above with two small, 

 sharp spines, distal and subdistal; carpus with a triangular spine at 

 inner angle and a granulated tubercle at articulation with man us; 

 the latter has five carinae outside, and two above which are furnished 

 with 2 or 3 tubercles each. Fingers granulated, dark color reaching 

 nearly to base. Legs hairy, tips of dactyli bent downward. 



Female. — Much m.ore uneven than the male, the elevations forming 

 large bosses, one occupying the whole of each protogastric region, two 

 across the middle of each branchial region, of which the inner is the 

 smaller, the outer one pear-shaped and obliquely transverse in position. 

 Lesser but distinct bosses are on the hepatic region and the widest 

 part of the mesogastric. The cardiac region has a tendency to split 

 up into a 4 or 6 rayed fan. This sexual form is the hullatus of Balss, 

 described from two females. Between it and the male described 

 above there are intermediate forms of both sexes. See plate 91. 



Young. — In the very young the antero-lateral teeth are longer, 

 thicker, more curved and separated than in the adult and show 

 greater alternation in size; the first of the postero-lateral teeth is 

 more pronounced. 



Measurements. — Largest American specimen, male (50637), length 

 of carapace 21.4, width of same 29.5, fronto-orbital width 11.2, 

 width of front between antennae 4 mm. Male (54498), length of 

 carapace 29.5, width of same 41.4, fronto-orbital width 15.8, width of 

 front between antennae 5.4, width between tips of inner orbital teeth 

 8.1 mm. 



Range. — From La JoUa, Calif., to Gulf of California, Mexico. 

 Japan; Korea. 



Material examined. — See table, page 209. 



