42^ PROF. C, CHILtOit O^r some tERRI^STEllL 



less well-marked expansions of the epimera of the third and fourth pleon 

 segments and of the base of the uropoda. 



Campbell Island lies about 400 miles to the south-west of New Zealand, 

 and the existence on it of this terrestrial Isopod so nearly allied to the species 

 on the mainland is additional evidence that the island was formerly directly 

 connected with New Zealand. No species of JS^otoniscus has yet been recorded 

 from the Auckland Islands which lie between Campbell Island and the main- 

 land, but probably i\^. australis or a closely allied species will be found to 

 occur there. 



General description : — As the mouth-parts and other organs of this species 

 have been investigated more fully than those of N. hehnsii, it will be con- 

 venient to give a more detailed description than was done for that species. 



The antennules (Fl. 36. fig. 10) are small, consisting of the usual three 

 joints, the first of which is much the largest, it is more than twice as long 

 as the second and a little longer than the third, which is much narrower 

 than the second and bears at the end one or two minute spinules. 



The arUennce (fig. 11) hardly require any description beyond that already 

 given. 



The upper lip (fig. 12) is of the usual shape^ quadrangular, narrowing 

 somewhat distally and with the free margin convex and fringed in the 

 centre with very minute setse. 



In the mandibles the right and left pairs differ in the character of the 

 accessory appendage. The right mandible (fig. 14) has the main cutting- 

 edge divided into three prominent teeth; the accessory appendage is somewhat 

 cylindrical, curved, and has the apex rounded and bordered with a circular 

 row of stout seta3 closely set together, at its base arises a single long fringed 

 seta ; the molar tubercle is of the usual form. In the left mandible (fig. 13) 

 the main cutting-edge contains three or four strongly chitinized teeth ; the 

 accessory appendage is similar in appearance to the main cutting-edge and 

 it is divided into three similar teeth ; at its base and between it and the 

 molar tubercle arise two long fringed setae. 



The lower lip is deeply cleft, each lateral lobe with outer margin strongly 

 convex and fringed with minute seta3 arranged in small tufts or very short 

 transverse rows ; the whole of the extremity and the inner margin of each 

 lobe is fringed with numerous fine, fairly long seta;. There is apparently a 

 median portion to the lower lip somewhat similar to that described by 

 Racovitza (1907 and 1908) for some species of Triclioniscus and allied genera, 

 but it is very delicate and I have not made it out with certainty in the 

 single specimen that I was able to dissect. 



The first maxilla (fig. 17) has the two lobes of the usual form and of about 

 equal length, the outer being as usual much the broader; nearly the whole of 

 its outer margin is fringed with short transverse rows of small setae, its 



