South African Crustacea. 461 



difference in globosity of the two sexes is chiefly due to the great 

 breadth and convexity of the female pleon with its multitude of small 

 eggs, while the male pleon is narrow and not inflated. In each sex the 

 ventral surface of the body has a strip of tubercles on either side of 

 the tightly folded pleou. In the female the segments 3 to 6 are 

 consolidated, in the male only 3 to 5. In both the telsou is very small, 

 that of the female partially immersed in the preceding segment, in the 

 male, not so, but fringed with setules, and having ventrally at the base 

 an opaque white crescent- shaped process, of which the attachment 

 could not be determined as between the preceding segment and the 

 telson. 



The front of the carapace is emargiuate. Then comes a deep 

 depression between two eminences just behind the orbits. The 

 carapace then widens, with a large tubercle near each margin, and 

 further back has a median pair, to the rear of which in the actual 

 middle is a very large tubercle flanked by less considerable promi- 

 nences, and followed by another large tubercle midway between it and 

 the hind margin. This forms a very obtuse angle marked by a 

 small tooth, with similar teeth at each extremity. Most of the surface 

 is diversified with granules, which are displayed according to the 

 magnification employed or the particular incidence of the light. 



The triangular fourth joint of the third maxillipeds is not very much 

 shorter than the preceding joint, and the exopod, though broad, is not 

 extravagantly widened. The fingers of the chelipeds are as long as 

 the palms, and have minutely interlocking teeth towards the extremities 

 of their confronting margins. The delicate long-fingered ambulatory 

 limbs were present only on the male example. 



Locality. Natal waters, Umhloti River, N.N.W. H miles; depth 

 27 fathoms. A 503. 



GEN. NUKSIA, Leach, 1817. 



(See these Annals, vol. 17, p. 246, 1920, and add 

 1915. Nursia. Balss, Decapoden rot. Meeres, vol. 31, pt. 2, p. 17.) 



NUKSIA POSTULANS, U. Sp. 



Plate CXIII. 



Among several examples or varieties of the form already described 

 as JVttrsza scandens, one specimen seems to claim specific distinction 

 by the characters of the carapace and pleon. The front is slightly 

 emarginate, the hind margin strongly bilobed, behind a large blunt 



