FRESHWATER AND LAND CRAYFISHES OF AUSTRALIA 
49 
Length of adult specimens, 75 mm. 
Rostrum broad, reaching to base of third segment of first antennae, apex 
blunt ; carinae sharp, carried well back on to carapace, lateral carinae blunt, 
each ending in a rounded boss. 
Eyes large. First antennae with inner flagella seven-eighths as long as 
outer. Outer antennae slender, reaching to third abdominal segment; each 
squame broad, reaching to base of third segment of first antennae. Inter- 
antennal spine very long and slender. Exopods of third maxillipedes reach- 
ing to anterior margin of ischius. 
Carapace as broad as high, twice as long as broad, shorter than abdomen ; 
cervical groove deeply impressed, rounded ; branchio-cardiac grooves obso- 
lete, areola broad. Branchiostegities and anterior of carapace studded with 
numerous small tubercles tipped with short hairs, dorsum of carapace densely 
punctate. 
Abdomen smooth, lateral margins rounded. Telson narrowly cone-shaped, 
with a spine on each lateral margin near posterior margin, posterior half 
divided by a longitudinal median groove; uropods rounded, longer than 
telson, inner rami each divided by a longitudinal median carina, a spine at 
apical third of outer lateral margin ; outer rami each with nine or ten sharp 
spines along tranverse suture, suture placed at apical third, upper portion of 
uropods divided by two parallel longitudinal median carinae, one carina on 
posterior portion. Swimrnerets short and slender, especially in male. 
Sternal keel narrow, fiat or slightly rounded; first two pairs of processes 
small, slender and sharp ; third and fourth pairs larger and rounded, slightly 
grooved ; processes between fourth pereopods long and stout. Below lateral 
processes of third pereopods is a pair of large deep openings, largest in 
female. 
Great chelae short and stout; propodus twice as long as broad, densely 
tuberculate; upper margin serrated, lower margin smooth, cutting edge with 
one large and two or three small tubercles ; dactylus short and stout, densely 
tuberculate, with cutting edge smooth or with a few feeble tubercles. Carpus 
triangular, with a row of small tubercles on upper margin, surface punctate ; 
merus punctate, upper margin feebly serrated. 
Gill formula : 
Podobranchiae 
Arthrobranchiae 
Pleuro- 
branchiae 
Total 
Anterior 
Posterior 
vii 
0 + ep.r. 
0 
0 
0 
0 -f- ep.r. 
viii 
1 
1 
0 
0 
2 
ix 
1 
1 
r 
0 
2 + r 
X 
1 
1 
r 
0 
2 + r 
xi 
1 
1 
r 
0 
2 + r 
xii 
1 
1 
r 
0 
2 + r 
xiii 
1 
1 
r 
0 
2 + r 
xiv 
0 
0 
0 
0 
0 
6 -f- ep.r. 
+ 6 
+ 5r 
+ o 
= 12 -f- 5r + ep.r. 
Colour . — General appearance from above, light chocolate brown; trans- 
lucent orange below. Pereopods, merus of chelae and tips of chelae trans- 
lucent orange; underside of carpus violet. 
D 
