04 Nioholls and Barnes — A New Terrcsirial Isopod. J 
T1k‘ gr(.‘at(‘r number of s])ecimens collected are males, a fact i 
which could readily be made out by an inspection of the ondopods t • 
of the first two pairs of pleopods; of the remainder, none bear eggs . ‘ 
and cannot be definitely recognised as females. In all, the body h 
lias the same general structure. The specimens were ])i‘esorved in !.!• 
strong alcoliol, and all liad l)ecome dorsally flexed, some very 
strongly indeed. ‘ • 
V ' 
• 1 
II. stcpfieni may readily be recognised from its congeners by i ^ 
its extremely narrow' l)ody, four times as long as wide, the leiiglii 
in H. mliita being less than three times the width, while in K. 
scarlci the breadth is relatively greater still, being little less than 
half the length. The translucency of H. stepheiii seems to be 
peculiar, also, and suggests that living as it does in an area of 
much lighter rainfall, and subjected to much greater risk of 
dessication, it has become habituated to lengthy periods of sub- 
terranean life, this burrowing habit doubtless being associated 
with the attenuated form of the body. 
The eye of //. stcpltcni is intermediate in size between that 
of H. scadei, Avhieh is much larger, and that of H. salma, which is 
distinctly smaller. 
in the general rectangular shape of the joints of the legs H. 
siepheni differs from both of the other species. In none of our 
specimens was the merus broadened as it is said to be in K. f^earlei 
and JL i-ialina. The relatively considerable length of the eiulopodites 
of the j)leopods 1 and 2 also appears to be peculiar to if. stepheni. 
In its telson \i resembles if. mlina, the lateral portions of this region 
being much more evident in if. scadei. 
The discovery of a third species of this genus, which, unlike 
the other two forms, is ca}>able of living out of Avater, is of 
considerable interest. 
Chilton, ill his discussion (1920, pp. 732-4) on the occurrence 
and origin of fi. scarici, comes to the conclusion that that form is 
to be regarded as a terrestrial form Avhich has become adapted to 
an aquatic existence, rather than a marine form cut oft' from its 
oceanic connections and surviving in salt lakes, his conclusion being 
strengthened by the evidence that Lake Corangamite is not of 
marine origin. 
In II. salina Ave have equally an aquatic form living in the 
muddy border of a small coastal salt lake of a high degree of 
