62 DISCOVERY REPORTS 



where the austrinorum forms are smaller, and the typical specimens (St. 170) somewhat 

 larger, than Hodgson's co-types. 



Table VI 



* In order the more readily to compare these proportions, the length of the second segment 



is regarded as = 10. 

 f T.N. = Terra Nova collection. 



N. aiistrole differs from the majority of the species in group II in two respects: 

 (i) the auxiliary claws are vestigial, and (2) the oviger in the male shows a considerable 

 departure from the norm, certain portions being much inflated and thin walled (cf. 

 Fig. 26 b with Figs. 26 a and c, and 27). Two other Antarctic species, not represented 

 in the Discovery collection, were also found to have certain segments inflated — viz. 

 A'', capense, Hodgson, and N. compoctiim, Hoek (see Gordon, 1932, pp. 1 15-120). In 

 both these species the auxiliaries are absent. The inflated condition is least developed 

 in N. compactum and most pronounced in N. australe. In all three species segment 5 

 is relatively short and stout so that they may be regarded as aberrant members of 

 group II. N. australe shows affinities with N. orcadense (see Table III), for the palp 



