REVISION OF THE GENUS EUASTACUS 
13 
transverse suture, with a spine on each lateral margin at suture and three 
or four small spines on surface; inner rami of uropods each with a spine on 
lateral margin near posterior margin, median carina feeble, ending in a sharp 
spine near posterior margin ; outer rami of uropods each with numerous 
spines along the transverse suture, three small spines on outer lateral margin. 
Lobes at base of uropods without spines. 
Sternal keel bluntly rounded between first and third pereopods, sharp 
below great chelae ; first pair of lateral processes very small and sharp, second 
pair larger, third pair four times as large as first, rounded; posterior pair 
large, blunt, and deeply grooved ; processes between fourth pereopods long 
and stout. 
Great chelae slender, propodus two and one-half times as long as broad, 
upper mpgin with four sharp spines. Lower margin with two rows of large 
sharp spines posteriorly and a single row of smaller spines anteriorly, cutting 
edge with two large and several small tubercles, a few small tubercles on 
upper surface below base of dactylus ; dactylus very long and stout, apex long 
and slender, several small tubercles on cutting edge; upper margin usually 
smooth or with one spine near base, two or three small sharp spines near 
apex. Carpus with two long sharp spines on upper margin, upper surface 
deeply grooved ; merus with two large and five small sharp spines along upper 
margin. 
Habitat. — Victoria: Echuca, Murray River (type locality) (Dr. W. J. 
Harris) ; Shepparton, Goulburn River (A. D. Butcher) ; Broken River (E. 
Clark; ; Ten Mile, Upper Goulburn River (E. Clark) ; Jamieson River (A. 
Hordern) ; Howqua River (E. Clark). 
The extremely long second tinteimae and the slender chelae 
at once distinguish this species from any other known memher 
of the genus. The specimens from the headwaters of the 
Goulburn River, Howqua and Jamieson Rivers, differ from 
the others only in having shorter antennae. 
Euastacus armatus (von Martens). 
Plate II. 
Astacus armatus von Martens, Ann. Mag. Nat. Hist., ser. 3. xvii 1866 
p. 359. 
Astacopsis spinifera (Heller), Faxon, Proc. U.S, Nat. Mus., xx, 1898, p. 670' 
Mem. Mus. Comp. Zool., xl, 1914, p. 402. 
Astacus serratus Shaw, McCoy, Ann. Mag. Nat. Hist., ser. 3, xx, 1867, 
p. 189; von Martens, Monats. Akad. Wiss. Berlin, p. 615, 1868.’ 
Astacoides serratus (Shaw), AIcCoy, Prodromus Zool. Viet., i dec ii 1878 
p. 17, pi. 15. • . - 
Astacopsis serratus (Shaw), Haswell, Cat. Austrl. Mus., Crust., 1882, p. 174; 
Ortmann, Proc. Amer. Philos. Soc., xli, p. 292, 1902; Smith, Proc. Zool! 
Soc. Lond., 1912, p. 157, pi. 16; McCulloch, Rec. Austrl. Mus. no. 11, 1917, 
p. 237; Hale, Handbook Crust. Sth. Australia, 1927, p. 75, fig. 6 and fig. 73. 
Length of average adult specimen 300 mm. 
Rostrum very long and broad, reaching beyond end of third segment of 
second antennae, apex long and sharp ; lateral carinae obtuse, each with three 
or four sharp spines. A blunt, punctate carina ending in a small sharp 
spine at base of each carina, and a small sharp spine on a large rounded boss 
posterior-laterally to it. 
