FRESHWATER AND LAND CRAYFISHES OF AUSTRALIA 29 
dactylus short and stout, upper margin smooth, cutting edge with two or 
three small tubercles. Carpus with a small, blunt, forwardly-directed spine 
on upper margin ; upper margin of merus smooth. Upper margin of propodus 
and carpus, and cutting edge of propodus and dactylus densely covered with 
long setae. 
Colour . — Carapace very pale olive-grey; abdomen light buff; underside 
and pereopods translucent white; joints of pereopods and great chelae 
vermilion ; great chelae : ground colour light buff, suffused with light 
bluish-green. 
Habitat. — Victoria: Nurrabiel, about 25 miles SW. of Horsham (type 
locality) (F. E. Hutchinson, 1935); Skipton (E. C. Austin, 1936). New 
South Wales: Berrigan (A. Hordern, 1935). South Australia: Angaston; 
Birdwood; Blackwood; Bordertown (L. Larwood, 1936) ; Gawler; Hamley 
Bridge; Koppio, near Todd River Reservoir (P. A. McDonald, 1936). 
Types in the National Museum, Melbourne, 
A series of 147 specimens from Victoria, 85 from South 
Australia, and 15 from New South Wales, was examined. 
Near C. destructor , but readily separated by the extremely 
large great chelae, and the sternal keel. This species is com- 
monly known at Nurrabiel and Skipton as the White Yabby, 
to distinguish it from the common yabby, C. destructor, which 
is abundant in the same localities. 
As in C. destructor there are numerous variations in the 
size and shape of the interantennal spine, rostrum and great 
chelae. 
Cherax punctatus sp. nov. 
(PI. I, fig. 6; PI. VI, fig. 25.) 
Length of largest specimen examined, 121 mm. 
Rostrum broadly cone-shaped, slightly longer than broad at base, apex 
rounded ; carinae blunt, with two rows of punctures along each carina ; 
lateral carinae each ending in a rounded boss, a row of deep punctures along 
each carina. 
Squarne of each second antenna rather short, reaching to base of second 
segment of first antenna, inner lobe moderately broad, terminal spine short 
and sharp. Interantennal spine slender, bell-shaped, surface concave. 
Carapace shorter than abdomen, broader than high. Cervical groove 
deeply impressed, branchio-cardiac grooves obsolete, areola narrow. Entire 
carapace densely punctate ; branchiostegities and anterior of carapace minutely 
tuberculate. 
Abdomen densely punctate. Telson longer than broad, anterior calcareous, 
posterior from apical third membranous, a spine on each lateral margin at 
junction of membranous portion. Uropods half calcareous and half mem- 
branous, inner rami each with a longitudinal median carina ending in a short 
spine on membranous portion, a long sharp spine on outer lateral margin; 
numerous small blunt spines along transverse sutures of outer rami. Lobes 
at base of uropods without spines. 
Sternal keel (PI. I, fig- 6) narrow, raised and very sharp; first two 
pairs of lateral processes very small, third pair larger, with a conspicuous 
