Muiina /ro»i New Zealand. 11 



tion, the protopodite^ wliicli bears an inner, flat, rectangular, 

 branchial plate, the endopodite, which narrows sligiitly towards 

 the distal end and bears at its extremity three long, delicately 

 plumose seta} ; the outer part ot" the appendage, the exopo- 

 dite, is not separated at the base from the protopodite ; it 

 consists of two joints, the first rectangular, bulging a little 

 distally on the inner side, the second subtriangular, bearing 

 a lew small sctaj at the extremity and three longer ones on 

 the outer margin ; the outer margin ot" both joints is also 

 closely fringed with very tine short seta;. 



'\^\\Q fourth and fiftli jAeupoda I have not been able to sepa- 

 rate out quite satisfactorily, but they appear to consist of 

 rounded branchial plates with margins quite free from setae. 

 Among the other parts I found the a[)pendage represented in 

 figure 14 of Plate II. This I believe to be the exopodlte of 

 the fourth pair of pleopoda j it is somewhat similar to the 

 exopodite of the third pair, but narrower and more delicate ; 

 the basal portion is long and curves slightly outwards, the 

 whole of its outer margin is finely crenated and fringed with 

 very delicate setae, which project radially outwards at each 

 crenation ; the second joint is subtriangular, joined to the 

 first by an oblique articulation ; it has the outer margin 

 fringed with fine setce and bears at the end two very long, 

 delicately plumose setfe longer than the joint itself. 



In the female the first pair of pleopoda (fig. 11a) have been 

 modified to form an oval operculum, Avhich is only slightly 

 longer than the greatest breadth ; it consists of a single piece 

 without any suture or other mark showing the different parts 

 of which it is composed ; the extrciuity, which is nearly 

 straight, bears six or seven very small fine setae. 



The other pleopoda of the female, with the exception of 

 course of the second, appear quite similar to those of the male. 



The uropoda (Plate 11. fig. 15) are very small, conical, and 

 bear a few small seta3. They are the same in both sexes. 



Sexual differences. — In no point do we find so much variety 

 as in the characters by which the female differs from the male 

 among the Crustacea. These differences are found some- 

 times in one part of the body and sometimes in another, and 

 the parts affected are often different in closely allied species. 

 In the present species the female differs from the male in the 

 following points: — (1) In the character of the first pair of 

 legs; {'!) in the absence of the woolly hairs found on the 

 carpus of the fifth, sixth, and seventh pairs of legs in the 

 male ; (3) in the special modifications of the pleopoda. 



