614 Dr. W. T. Caiman on 



is about as long as the peduncle and the exopod somewhat 

 longer. The proximal segment of the endopod is longer than 

 the distal and lias a row of spines on its inner edge, a much 

 stouter spine at its distal inner angle, and setae on its outer 

 edge ; the distal segment has spines on the inner edge, 

 increasing in length towards the slender apical spine, and 

 setas on the outer edge. The exopod has setae on the inner 

 edge and at the tip only. 



Adult male. — Length of body 18 mm. (fig. 2). 



The carapace resembles that of the female, except that the 

 antero-lateral angle is more broadly rounded. 



The pleural plates of the third free thoracic somite are cut 

 away behind where they are overlapped by a narrow tongue- 

 like lobe from the pleural plates of the fourth somite. 



The abdominal somites are without conspicuous ridges ; all 

 except the last have well-developed pleural plates. 



The peduncle of the antennules is not thickened, the third 

 segment being distinctly narrower than the preceding and 

 with only a few hairs at its distal end. 



The flagellum of the antenna is as long as the body and is 

 composed of very short segments which, for the greater part 

 of its length at all events, are not longer than broad. The 

 distal segment of the peduncle is unusually short and slightly 

 inflated. 



The legs, including the exopods of the second and third 

 pairs, resemble those of the female. 



The endopod of the pleopods (fig. 13) has its outer margin 

 angulated, but not produced into a narrow process. 



The uropods resemble those of the female, except that the 

 peduncle carries a brush of short closely set setae about the 

 middle of its inner edge. 



Var. granulata, Miers. 



The co-types of this variety differ from the typical form 

 not only in the very conspicuous granulation of the carapace, 

 but also in having on all the abdominal somites except the 

 last strongly marked dorsal, dorso-lateral, and lateral pairs 

 of ridges, and a feebler ventro-lateral pair. In addition the 

 appendages, and especially the first legs and the uropods, are 

 a little more elongated. I think it not unlikely that this 

 form may be found to deserve specific rank when more 

 abundant material is obtained. 



Remarks on the Genus Heterocuma. — In establishing- this 

 genus Miers compared it with Eudorella and with Leptocuma. 

 Stebbing was apparently the first to place it in the family 



