184 
XiCHOLLS — Two New Plireatoicids. 
exactly two thirds of that of combined cephaloii and peraeon. First 
segment as sliort as first peraeon segment, second and third equal 
and longer than the first, fourth longer than preceding, the fifth 
deeply notched posteriorly and tAvice the length of the fourth. The 
setal fringe practically confined to inferior margin. The ventral 
border of the sixth pleon segment armed ventrally Avith stout pec- 
tinate setae, AA'liieh giA^e place to spines at the postero-lateral corner; 
its overlapping posterior pleural border fused Avith the telson and 
forming a short sutural line bearing but three fine setae. 
Telson large, horse-shoe shaped in transverse section, a aa'cII 
developed dorsal transverse depression defining the tip-tilted terminal 
ju'ojection, the latter armed A\-ith spines and setae and flanked on 
eitlier side, at a slightly lower leA-el, Avith strong spines. Ventrally 
the pleural margin of the telson is free from setae or sj)ines. 
First antenna short, not as long as the peduncle of the second, 
with a flagellum of five joints in the male and but three in the 
female; second antenna nearly lialf the length of the animal, almost 
as long as ceplialon and first five peraeon segments, peduncle barely 
lialf the length of the flagellum, Avhieh may have from eighteen to 
tAA'onty joints. Right mandible Avithout secondary cutting edge, both 
mandibles Avith Avell develo})ed curved si)inous plate bearing a double 
row of denticulate spines. 
Gnathopods strongly sub-chelate, the palm oblique and armed 
Avith a series of s^Aines which become broadened toAvard the proximal 
end of the joint into subtriangular serrated scutes. Second and 
third peraeopods appear to be slightly prehensile; the fourth, in 
the male, quite strongly sub-chelate; in the female, the fourth re- 
sembles the preceding; fifth, sixth and seATuth legs increasing pro- 
gressiA'ely in length, the subtriangular coxal regions distinctly marked 
off, but coloured exactly as the related segments; basal joints 
rounded, little ex])aiided. Pleopods 3-5 AA’ith large endopodites ; 
uropods long, peduncle bearing on its extremity, one thick and one 
slighter spine pectinated dorsally, rami slender, not A^ery spiny. 
• 
Colour: Brown, generally very dark, Avith lighter (yelloAAUsh) 
markings; specimens taken in the open varying Avith the colour of 
the underlying mud, to light broAvnish or cA^en yelloAvish grey. The 
legs may then be a light yelloAV in colour. 
Length: Largest specimens (male) 14 to 15mm., none of the 
mucli less numerous females exceeding eleven millimetres. 
Hahiiai: Taken in bogs, among the groAvth of sphagnum, also 
in Aveedy runnels among the tufts and roots of grass on the Mt. 
Buffalo Plateau, Victoria. 
Detailed Description. — Eyes: Small, feAv (12-14) ommatidia, 
