322 Mr. R. I. Pocock on new Genera 
first four segments elevated and terminating behind in strong 
teeth; the segments straight-sided, the first a trifle longer 
than wide, the second much longer than wide, the fourth 
twice as long as wide; the median lateral keel of the fifth 
extending throughout half the length of the segment; vesicle 
as wide as the second segment, wider than the third, fourth, 
or fifth. 
Palpi, humerus, and brachium flattish, normally keeled, 
finely granular above, the brachium with a smallish bifid 
tubercle on its anterior aspect, and with 8-9 pores on its 
lower surface in front of the keel; manus less than twice as 
wide as the brachium, keeled as in nove-hollandie, but flat 
above, the upper and external surfaces being at right angles 
to each other as in U. Darwinii, the lower surface also flat 
and furnished with a series of 8—9 pores; the length of the 
hand-back greater than the width of the hand, but a good 
deal] less than the length of the movable digit; the digits in 
contact, elongate, the immovable with three pores above, the 
posterior of which is well on the digit, and four externally. 
Legs finely granular, the femora granularly carinate be- 
neath. 
Pectines just reaching the extremity of the posterior coxe, 
furnished with 14 teeth. 
Genital operculum a little shorter than the sternum, its 
posterior border semicircular. 
Measurements in millimetres.—Total length 64, of cara- 
pace 8°5, of tail 385; width of first segment 3, of fourth 2:7, 
of fifth 2°5, of vesicle 2°8 ; manus, width of the upper surface 
4-5, height 3°3 ; length of hand-back 7:2, of movable digit 8-2. 
Locality. ‘ Within 30 miles of Perth, W. Australia” 
(H. W. J. Turner, Esq.). 
At once to be recognized from all the hitherto described 
species of Urodacus by its flat hands and thin tail. In both 
these characters it approaches U. Darwinii ; but easily dis- 
tinguishable on account of being finely granular, in having 
strongly elevated superior caudal keels, &c. 
Urodacus Woodwardit, sp. n. (Pl. XIV. figs. 8 and 9.) 
Allied to U. nove-hollandie and to U. abruptus. 
?. Colour ochraceo-ferruginous, palpi redder, legs yellower. 
Upper surface of the trunk very weakly granular, the 
tergites almost entirely smooth and polished. 
Tail with the keels developed almost exactly as in U. nove- 
hollandiew, but the whole organ shorter, being only three and 
a half instead of four times the length of the carapace, and 
