FRESHWATER AND LAND CRAYFISHES OF AUSTRALIA 
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longer than telson, inner rami rounded, each divided by a longitudinal median 
carina reaching to posterior margin, without spines ; outer rami rounded, each 
divided by a longitudinal median carina, transverse suture placed at posterior 
third, three sharp spines on suture. Telson and uropods with numerous 
tufts of long stout setae. 
Sternal keel raised and blunt; first two pairs of lateral processes rudi- 
mentary, small but sharp below second pereopods ; small and blunt below 
third pereopods, deeply grooved; processes between fourth pereopods long 
and slender. 
Great chelae short and stout; propodus smooth, twice as long as broad, 
upper margin formed by two rows of small tubercles ; lower margin almost 
smooth, two or three very small tubercles posteriorly ; four tubercles on 
cutting edge. Dactylus stout, with three tubercles on cutting edge, upper 
margin smooth ; a few tufts of short setae scattered over propodus and 
dactylus. Carpus with three rows of large tubercles on upper surface, centre 
of upper surface deeply hollowed; merus with a row of small tubercles on 
upper margin. 
Posterior pleurobranch long and well developed. Posterior arthrobranchs 
small, last thread-like. No gill-filaments on epipod of first maxilliped. 
Female . — Length of average adult specimen, 73 mm. 
Similar to male but differs in the form of the outer rami of the uropods, 
and the great chelae. The outer rami of the uropods are larger than in the 
male, and the posterior margin of each ramus is broadly crenulate. 
Great chelae long and slender, propodus two and one-half times as long 
as broad, upper margin formed by two rows of small tubercles, lower margin 
with a single row of very small tubercles, three tubercles on cutting edge; 
dactylus long and slender, three tubercles on cutting edge, upper margin 
smooth; propodus and dactylus covered by numerous tufts of long, stout 
setae. Carpus with two rows of tubercles on upper surface, not grooved as in 
male ; upper margin of merus with a row of small tubercles. All the pereo- 
pods densely hirsute. 
Colour . — General colouring bright orange. Great chelae, carpus and 
merus orange; propodus and dactylus bright translucent blue, apex of both 
and tubercles orange. 
Habitat. — Victoria: Acheron River flats, near Marysville (E. Clark, 
Dec., 1935). 
Types in the National Museum, Melbourne. 
This species somewhat resembles E. tuberculatus sp. nov. 
but is readily separated by the form of the abdomen and great 
chelae. The differences in the form of the chelae in the sexes 
of this species is very striking, being constant in all examples. 
A series of 135 specimens varying in size from 12 mm. to 
73 mm. long examined. Many of the small specimens (25 mm.) 
are a dull dark blue colour all over, others have the same 
colouring as the adults. The smallest specimens are salmon 
pink. 
This species burrows both in swampy ground near the river, 
and higher up the bill in dry, heavily-timbered ground. The 
burrows in the swamp have a large cone with the opening on 
the side, near the top of the cone; burrows from eighteen 
