Chilton. — On the Isopodan Fauna of Neiv Zealand. 147 



but it so evidently belongs to tbe same group, that I have thought it better 

 that the genus should be widened than that matters should be complicated 

 by the addition of a new genus. 



In the upper antenna (pi. XVIII., fig. 2) the basal joint of the peduncle is 

 very large, and on the inner side, at about one-third of its length from the 

 base, there is a projection (p), the edge of which is crenulated. There is a 

 somewhat similar structure in Apseudes talpa, but it is not so well marked. 

 The two projections of the two antenna? appear to fit with one another and 

 form a grasping organ of some hind. The second joint of tbe peduncle is 

 only one-third the length of the first and is slightly expanded distally ; it 

 is followed by tbe third joint, half as long as the second, bearing the tioo 

 flagella. It is, I believe, only in this genus of Isopoda that the upper 

 antenna has two flagella, though it is common enough among the Amphi- 

 poda. 



The secondary (inner) flagellum is half as long as the primary one, and 

 consists of about six joints, the primary flagellum having about fourteen. 

 On the primary one several of the joints bear longish simple setae, and a 

 single auditory cilium at their distal ends (fig. 2 a). 



In the second antenna (pi. XVIII., fig. 3) four joints can be distinguished 

 in the peduncle, possibly there is another joined to the head. From the 

 first of these joints there springs a small projection ending in a very long 

 seta ; this may possibly correspond to the " olfactory denticle " of Spence 

 Bate, which is so common among the Amphipoda. The last joint of the 

 peduncle is about as long as the two preceding together and is followed by 

 the flagellum, which contains about eight joints bearing long ciliated setae. 

 In other species of Apseudes the inferior antenna bears a small oval squa- 

 mose plate on the peduncle, something like that found in the Macroura, 

 but I have not been able to find any similar structure in my species. 



The mandible (pi. XVIII., fig. 4) is large and powerful, besides the teeth 

 on the fixed portion there are also some on the end of a large piece which 

 projects from about the middle and appears to be movable. The appen- 

 dage consists of two joints, though there may also be another close down to 

 the mandible itself. The second last joint is the longest and bears several 

 short seta?, the last joint narrows towards the end and bears several short 

 and two or three long setae. 



As I have only had a single specimen I have not been able to make out 

 all the mouth-parts satisfactorily ; the one represented in fig. 5 I believe to 

 be the second maxilla, or perhaps only part of it. It consists of two pieces, 

 one narrows towards the distal end, which bears a crown of strong setae ; 

 the other springs as an appendage from the base of tbe first, it also narrows 

 towards the end, this is covered with very short hairs and bears four very 



