AUSTRALIAN FRESHWATER AND LAND CRAYFISHES 
39 
Engaeus marmoratus sp. nov. 
Plate X, Fig. 7. 
Length of average adult specimen 60 mm. 
Rostrum broad, reaching almost to base of third segment of first antennae, 
apex sharp and upturned; carinae sharp, carried well back on to carapace. 
Squame of second antennae long and sharply pointed, inner lobe short, 
broad posteriorly. Interantennal spine large and broad, somewhat triangular, 
lateral margin serrated. Exopod of third maxillipedes long and slender. 
Sternal keel slender and sharp, serrated ; second and third pairs of lateral 
processes with a small round opening, fourth pair large, deeply grooved ; 
processes between fourth pereopods long and stout. 
Telson narrowly cone-shaped, almost as long as the uropods, with a spine 
on each lateral margin; inner rami of uropods rounded, with a sharp spine 
on outer lateral margin, each divided by a longitudinal median carina ending 
in a sharp spine near posterior margin; outer rami rounded, with a spine 
on outer lateral margin above the transverse suture, each divided by a 
longitudinal median carina, ending in a spine at transverse suture, the suture 
placed at the posterior third of ramus, numerous small spines along the 
suture. 
Great chelae punctate and setose; propodus more than twice as long 
as broad, with one row of small tubercles on upper margin, lower margin 
smooth, several small tubercles along cutting edge of propodus ; dactylus 
long and slender, a smooth carina along upper margin, several small tubercles 
along the cutting edge. A dense area of long stout setae on upper and 
lower surfaces of propodus and dactylus. Carpus and merus each with a 
row of tubercles along upper margin. 
Posterior pleurobranch long and well developed. 
Habitat. — Victoria: South Buchan (E. Clark). 
Types in the National Museum, Melbourne. 
Near E. fultoni, Sm. & Sch., but separated particularly by 
the great chelae and the sternal keel. 
Engaeus orientalis sp. nov. 
Plate X, Fig. 8. 
Length of average adult specimen 58 mm. 
Rostrum broad, reaching almost to base of third segment of first antennae, 
apex sharp and upturned, carinae sharp, reaching almost to apex, carried 
welt back on to carapace. 
Squame of second antennae long and slender, with a long sharp terminal 
spine, inner lobe slender. Interantennal spine short and broad, apex 
rounded. Exopod of third maxillipedes short and stout. 
Sternal keel broad, more or less bluntly raised ; first three pairs of lateral 
processes obsolete, fourth pair small, deeply grooved, processes between 
fourth pereopods long and slender. 
Telson narrowly cone-shaped, almost as long as uropods, with a spine on 
each lateral margin near the posterior margin ; inner rami of uropods 
rounded, each with a sharp spine on outer lateral margin, each divided by 
a longitudinal median carina ending in a sharp spine near posterior margin ; 
outer rami rounded, each with a spine on outer lateral margin above the 
transverse suture, each divided by a longitudinal median carina ending- 
in a spine at transverse suture, the suture placed at the posterior third of 
ramus, several small spines along the suture. 
