16 
REVISION OF THE GENUS EUASTACVS 
of Curdies River, Cobden (W. A. Hall) ; Barwon River (W. Kershaw) ; 
Plenty River (S. A. Keartland) ; Watts River; Badger Creek; Bunyip River 
(W. Kershaw) ; Tarago River, near Warragul (Geo. F. Hill) ; Yea River 
(C. W. Brooks, Yea State School); King Parrot Creek; Acheron River 
(A. D. Butcher) ; Murrundindi River. 
Readily separated from E. armatus (von Martens) by the 
armature of the carapace and abdomen, the form of the chelae, 
and the length of the antennae. 
Euastacus serratus (Shaw). 
Plate IV. 
Cancer serratus Shaw, Zool. of New Holland, i, 1794, p. 21, pi. 8. 
Potamobius serratus (Shaw), White, Proc. Zool. Soc. Lond., 1850, xviii, 
p. 95, pi. 15. 
Astacopsis serratus (Shaw), Haswell, Cat. AustrL Mus. Crust., 1882, p. 174; 
Smith, Proc. Zool. Soc. Lond., p. 157, 1912, pi. 16; McCulloch, Rec. Austrl. 
Mus., no. 11, p. 237, 1917. 
Astacoides spinifer Heller, Reise Novara. Zool., ii, pt. 3, Crust., 1865, p. 102, 
pi. 9. 
Astacopsis spinifer (Heller), Spence-Bate, “Challenger” Reports, xxiv, 1888, 
p. 195, pi. 28. 
Astacopsis spinif era (Heller), Faxon, Proc. U.S. Nat. Mus., xx, 1898, p. 670; 
Faxon, Mem. Mus. Comp. Zool., xl, 1914, p. 402. 
Astacus aiistralasiensis Milne-Edwards, Hist. Nat. Crust., ii, p. 332, pi. 24, 
figs. 1-5, 1837 ; Audouin and Milne-Edwards, Arch, du Mus. d’Hist. Nat., 
ii, 1841, p. 36; Erichson, Arch. f. Naturg., xii, 1846, p. 94; Heller, Reise 
Novara, Crust., 1865, p. lOO; von Martens, Monats. Akad. Wiss. Berlin, 
1868, p. 618; Faxon, Proc. U.S. Nat. Mus., xx, 1898, p. 675. 
Astacopsis paramattensis Spence-Bate, “Challenger” Reports, xxiv, 1888, 
p. 202, pi. 27; Faxon, Proc. U.S. Nat. Mus., xx, 1898, p. 675. 
Astacopsis sydneyensis Spence-Bate, “Challenger” Reports, xxiv, 1888, p. 204, 
pi. 23; Faxon, Proc. U.S. Nat. Mus., xx, 1898, p. 675. 
Length of largest specimen 222 mm. 
Rostrum long and broad, reaching almost to end of third segment of second 
antennae, apex short and sharp, lateral carinae obtuse, each with a few small 
tubercles. A blunt, punctate carina ending in a small blunt spine at base 
of each carina, and a rounded boss posterior-laterally to it. 
Second antennae slender, reaching to fourth abdominal segment. Squame 
smooth, inner lobe large and broad, terminal spine short and blunt. Inter- 
antennal spine long and slenderly triangular. 
Carapace twice as long as broad, broader than high, as long as abdomen. 
Branchiostegites with numerous short, broad obtuse spines placed in two 
irregular rows below each branchio-cardiac groove; a row of large, slender 
and sharp spines continued to anterior of carapace below cervical groove, 
remainder of each branchiostegite studded with numerous small tubercles; 
several small sharp spines on anterior of carapace below rostrum; entire 
carapace densely punctate. 
Sternal keel slender and sharp; a small, slender, sharp spine on keel 
below the third maxillipedes, great chelae, first and second pereopods; a 
slender sharp spine on keel between the spines of first and second pereopods. 
Lateral processes erect, upper margin sharp, processes between third pereopods 
