12 FRESHWATER AND LAND CRAYFISHES OF AUSTRALIA 
Euastacus serratus (Shaw). 
(PI. I, fig. 1; PI. II, fig. 12.) 
Cancer serratus Shaw, Zool. of New Holland, i, 1794, p. 21, pi. 8. 
Astacus serratus Gray, Eyre’s Journ. Exped. Disc. Cent. Austrl., i 
(Appendix), p. 409, 1845; McCoy, Ann. Mag. Nat. Hist., ser. 3, 
xx, p. 189, 1867; von Martens, Monats. Akad. Wiss. Berlin, p. 615, 
1868. 
Potamobius serratus White, Proc. Zool. Soc. Lond., 1850, xviii, p. 95, 
pi. 15. 
Astacoides serratus McCoy, Prodromus Zool. Victoria, i, 1879, p. 17, 
pi. 15. 
Astacopsis serratus Haswell, Cat. Austrl. Mus., Crust., 1882, p. 174; 
Ortmann, Proc. Amer. Philos. Soc., xli, p. 292, 1902 ; Smith, Proc. 
Zool. Soc. Lond., p. 157, pi. 16, 1912; McCulloch, Rec. Austrl. Mus., 
No. 11, p. 237, 1917; Hale, Handbook Crust. Sth. Austrl., 1927, 
p. 75. 
Astacoides spinifer Heller, Reise Novara, Zool., ii, pt. 3, Crust., 1865, 
p. 102. 
Astacopsis spinifer Spence-Bate, “Challenger” Reports, xxiv, 1888, 
p. 195, pi. 28; Faxon, Proc. U.S. Nat. Mus., xx, 1898, p. 670; Faxon, 
Mem. Mus. Comp. Zool., xl, 1914, p. 402. 
Astacus armatus von Martens, Ann. Mag. Nat. Hist., ser. 3, xvii, 1866, 
p. 359. 
Astacopsis sxdneyensis Spence-Bate, “Challenger" Reports, xxiv, 1888, 
p, 204, pi.' 23. 
Astacus australasiensis Miine-Edwards, Hist. Nat. Crust., ii, p. 332, 
pi. 24, figs. 1-5, 1837; Audouin and Miine-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. 100; von Martens, 
Monats. Akad. Wiss. Berlin, 1868, p. 618; Faxon, Proc. U.S. Nat. 
Mus., xx, 1898, p. 675. 
Astacopsis australasiensis Haswell, Cat. Austrl. Mus., Crust., 1882, 
p. 178; Faxon, Mem. Mus. Comp. Zool., xl, 1914, 8, p. 351. 
Length of average adult specimen, 300 mm. 
Rostrum twice as long as broad at base, apex long and sharp ; carinae sharp, 
with four or five sharp spines; a sharp spine at base of each carina, with 
another posterior-laterally to it. 
Second antennae reaching beyond end of telson; squame smooth, inner 
lobe broad, terminal spine long and stout. Interantennal spine triangular, 
ending in a blunt point, lateral margins smooth or feebly serrated. 
Carapace twice as long as broad, broader than high, longer than abdomen. 
Branchiostegites studded with numerous small tubercles, and eight to 
twelve sharp spines in an irregular row on upper margin. 
First abdominal somite with two sharp spines on each lateral lobe ; second 
with two spines on lateral margin, remaining somites each with a long sharp 
spine on lateral margin; four long sharp spines on dorsum of each somite, 
spines very small on sixth somite. 
Telson broad, slightly longer than broad, almost completely divided by a 
transverse suture, with a spine on each lateral margin at suture and five small 
spines on surface ; inner rami of uropods each with a spine on lateral margins, 
