182 
Nicholls — Tico New Phreatoicids. 
Amphisopus, gen. nov. 
l^ody long, peraeoii sub-eylimlrical, markedly compressed, 
k'irst segment sliort, more or less fused ndtli the lieadj which lacks 
a vertical groove near its posterior margin. Upper antenna filiform, 
longer than peduncle of lower antenna, tiagellum with ten or more 
joints. Lower antenna long, flagellum many jointed. Eyes large, 
^randibles with an a])pendage, right mandible retaining a reduced 
secondary dentate edge. First maxilla with six or seven plumose 
setae on inner lobe. Legs divided into an anterior series of four 
and a I’osterior series of three, the coxal joints scarcely or not dis- 
tinct. First ])air of legs sub-chelate in l)oth sexes, larger in the 
male than in tlie female; the fourth leg in the male not sub-chelate; 
l)asos of the three legs of the posterior series largely expanded. Pleon 
relatively longer than in Phrcaioicus ; the last segment almost, or 
completely, marked off from the telson. Coupling hooks on the basal 
joint of pleopods one and two; epipodites ui)on the third, fourth and 
fifth pleopods. In the male, a strongly curved penial filament on the 
endopodite of second pleopod, long and pointed, without terminal 
setae. Male appendage not setose. Uropods stout, biramous, 
styliforni. Telson large, horse-shoe shaped in transverse section, in 
profile suggesting a sub-conical body, without terminal projection, 
the dorsal margin entire, emarginate or cleft. 
With three species: — 
A. lintoni Nicholls (sp. typ.), Phreaioicus h, Nicholls, 1924, 
Jour. Roy. Soc, W.A., Yol. X, pp. 8.9-104, 1924. 
A, latipes (Chilton), 1923, Plireatoicus Chilton, Trans. 
Roy Soc. S.A., Yol. 46, p. 23, Figs. 1-14; P.h, Glauert, 
Jour. Roy. Soc., W.A., Yol. X, pp. 49-57, 1924; P.I., 
Nicholls, Jour. Roy. Soc., WhA., Yol. X, PI. 8, Fig. 3a, 
pp. 98-104, 1924. 
A. (Glauert), 1924, Plircatoicas p., Glauert, 1924, 
Jour. Roy. Soc., AV.A., Vol. X, pp. 49-57; P.p., Nicholls, 
Jour. Roy. Soc., AV.A., Yol. X, PI. 8, Figs. 2, 2a, pp. 
98-104, 1924. 
Distribution. At the time when the original description of A. 
lintoni Avas Avritten I had obtained my material from but a single 
locality, a small creek emptying into the estuary of the King River 
in South-Western Australia. Subse(pient collecting trips shoAA’ed that 
this siiecies occurs freely in aiul around Albany itself, one fine speci- 
men actually being taken in the Alarine DriA^e, and more than a 
dozen different spots yiehknl abundant material. In some case these 
Avere found ])lentifully in mere puddles along the railAvay line, or in 
larger hollows at the foot of the hill near the swamps at the land- 
ward end of the Deep AVater Jetty. Some of my larger specimens 
Avere taken practically at sea level, in a tiny runnel of fresh water 
within a half dozen paces of the spot ^vhere this discharged into the 
