328 Transaction*. 



finger-hinge, whole lower margin and greater part of the propod densely 

 fringed with long slender setae mostly arranged in transverse tufts and 

 rows : dactyl stout, its inner margin smooth, with a broad triangular process 

 towards the subacute apex. Peraeopoda stout and broad and very denselv 

 setose, especially the fifth, posterior margin of basal joint regularly pectinate 

 the pectinations longest towards proximal end. 



In other characters closely resembling E. subcarinatus. 



Female. — Fourth segment of pleon with single dorsal carina as in the 

 male. First gnathopod similar to that of male, but with side-plate not 

 appreciably produced anteriorly. Second gnathopod considerably larger 

 than the first but similar in general shape, merus ending acutely, carpus 

 about one-third as long as propod, which is only slightly broader than 

 carpus, whole propod densely setose, the long setae being arranged in 

 transverse tufts and rows, other long slender setae are present apparently 

 similar to those found in the male, palm very oblique defined by 

 one or two stout spinules and with a small spinose process near the 

 finger-hinge : dactyl normal, its inner margin smooth and without pro- 

 tuberance, apex acute. Peraeopoda with posterior margin of basal joints 

 simply serrate. 



Colour whitish. 



Length, up to 15mm. 



Distribution. — Blueskin Bay ; Otago (G. M. Thomson) : Moko Hinou 

 (('. R. Gow). Probably widely distributed on New Zealand coasts. 



Remarks. — The description of the second gnathopod of the female is 

 taken from an ovigerous specimen. It is interesting to note that it shows 

 more resemblance to the corresponding appendage in the male than is the 

 case in E. subcarinatus. The special characters of the second gnathopods 

 and the peraepods in the males are fully marked only in mature specimens ; 

 immature males are more like the females. 



Elasmopus bollonsi sp. nov. Figs. 11. 12. 



Male. — Third segment of pleon with posterior corner rectangular, not 

 produced, lower portion of posterior margin with small serrations. Fourth 

 segment of pleon smooth and without dorsal carina. First antenna 

 elongate, second antenna with peduncle shorter than that of first, both 

 with numerous long setae and in general resembling the antennae of 

 E. subcarinatus. Mandible with third joint of palp not very slender, hind 

 margin convex, front margin pectinate. First gnathopod shorter than in 

 E. subca inatus and much less setose but with the oblique pectinate row 

 on, the inner surface of the propod and with the other setae arranged on 

 the whole as in that species, basal joint stout, merus not ending acutely, 

 carpus as long as the ovate propod. Second gnathopoda unequal, the 

 right one similar to the first but larger, propod nearly twice as long as 

 carpus, setae normal, left gnathopod with basal joint, ischium, and merus 

 all small, carpus : mall triangular fitting into the outline of the propod 

 which is very large, longer than the rest of the appendage, and abnormally 

 shaped forming with the dactyl an irregular oval, setae few short and 

 scattered, anterior margin sinuous, palm oblique defined by a bluntly 

 rounded lobe and forming a depression on the inner side of the propod, 

 near the finger-hinge is a small flat-topped tooth followed by a larger one 

 of similar shape and then a low convex swelling, dactyl broad with blunt 



