Nicholls. — New Species of XIroctena- 
11d 
ncmarls , — In the retention of large and conspicuous eyes, tins 
species appears to be more primitive than the other members of 
the genus. Associated Avith this character is the more moderate 
development of the 2nd antennae (Text Fig. and PI. XIV, Pigs. 2, 
2a) Avhich are scarcely stouter than the first anteuiiMe in the male, 
Avliile in the female they are more slender. Nor is there any marked 
development of the setae such as is found in the blind U. setotia. 
Accessory gills are present, as in all members of this genus, 
Imt are small and ai»parently iinbranchcd. The armature of spines 
upon the bases of the second gnathopod in the males of U. wcstralis 
and U. ajfinis is much less prominent in f/. yellandi (PI. XIV, Pig. 
5) but upon the inner ' face of the first joint of the peduncle 
of the first antenna (PI. XIV, Pig. la) as also upon the carpus 
of the first gnathojmd (PI. XIV, Pig. 3) and in several of the 
joints of 3rd, 4th and 5th peraeopoda there is a somcAvhat similar 
arrangement of spines. 
In other respects, IiOAvever, the first gnathoiiod (PI. XIV, Pigs. 
3, 4) is much as in U- ivcstralis\ the propod of the second gnatho- 
pod (PI. XIV, Pig. 5) is more slender than in U. affiiiis and has 
a pair only of spines, as in U. setosa, to receive the tip of the 
da ctyl. 
In the female the difference in size of the “hands’’ (PI. XIV, 
Pigs. 4, 6) of the first and second gnathopods is but little marked. 
The third uropods (PI. XIV, Pigs. 7, 8) are relatively shorter 
and bioader than in tlie other species, but are ]ierhaps rather more 
setose. In the male, however, the seta-bearing expansion may have 
as few as nine setae, a smaller number than is found in any 
other species. 
The telson (PI. XIV, Pig. 9) is rather shorter and broader 
and more deeply cleft’ than in U. setosa; rather less deeply cleft and 
relatively longer than in U. wcstralis and V- affinis an<l distinctly 
more setose terminally than eitlier of those species. 
Upon the whole, it seems to occupy a position intermediate 
between U. setosa on the one hand and U. ajfinis and U. ivestmlrs 
on the other. Indeed it is probable that it differs very little 
from the form from which the three blind or purblind forms have 
been derived. 
List of liEf'ERENCES. 
1925 Chilton, Chas., Journ. Koy. Soe. W.A., Vol. XII, 1925. 
192(1 Nicholls, G. L., Journ. Roy. iSoc. W.A., Vol. Xll, 192(1 (in 
the t>i*ess). 
