322 Mr. E,. 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 segmentj wider than the third, fourth, 

 or fifth. 



Falpi^ humerus^ and hrachiuvi 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 novce-hollandice, but flat 

 above, the upper and external surfaces being at right angles 

 to each other as in U. Darioinii, 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 coxai, 

 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 35; 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 " 

 (//. 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 Woodwardii, sp. n. (PL XIV. figs. 8 and 9.) 



Allied to U. novce-hollandice and to U. ahruptus. 

 ? . 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. novce- 

 hollandice, but the whole organ shorter, being only three and 

 a half instead of four times the length of the carapace, and 



