FRESHWATER AND LAND CRAYFISHES OF AUSTRALIA 
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wide and sharp; processes between fourth pereopods short and stout, with a 
large blunt spine in centre of processes. 
Abdomen densely punctate, lateral margins of first somite covered with 
numerous small blunt spines or tubercles, following somites each with a few 
small tubercles on lateral margins; entire abdomen more or less densely 
hirsute. 
Telson with a spine on each lateral margin, and two or more median 
spines, at junction of membranous portion ; inner rami of uropods each with 
a median spine and an outer lateral spine at junction of membranous portion ; 
outer rami each with several sharp spines along transverse suture. Lobes 
at base of uropods with upper lobe produced into a long sharp spine. 
Great chelae : these vary in size and stoutness in individuals of all sizes, 
length varying from two and one-half times to three and three-fourths times 
as long as broad; upper margin feebly serrated, without the setose margin 
usually found in species of Cherax, lower margin smooth, cutting edge of 
propodus and dactylus each with two or three small tubercles, smooth in 
some examples ; apex of both sharply recurved. Carpus with one or two 
sharp spines on upper margin, upper surface deeply grooved. Merus with 
one or two small blunt tubercles on upper margin. 
Habitat. — Western Australia: Margaret River (Miss H. Alexander, 
1936); Harvey River; Korijekup; Kojonup; Balingup Brook; Warren 
River; Blackwood River; Katanning. 
Popularly known as tlie Marron, fully-grown specimens 
equal in size the large Murray River Crayfish. The difference 
in the size of the great chelae in the sexes is striking in the 
12 specimens examined, but in a large series it may not be 
a constant feature. Great variation is shown in the armature 
of the carapace and abdomen of immature and adult 
specimens. 
Cherax quinquecarinatus (Gray). 
(PI. V, fig. 20.) 
Astacus quinque-carinatns Gray, Eyre’s Journ. Exped. Disc. Cent. 
Austrl., i (Appendix), 1845, p. 410, pi. 3, fig. 3. 
Astacus quinquecarinatus Erichson, Arch. f. Naturg., xii, 1846, p. 376; 
White, List Crust. Brit. Mus., 1847, p. 72; von Martens, Monats. 
Akad. Wiss. Berlin, 1868, p. 616. 
Astacopsis quinque-carinatus Haswell, Cat. Austrl. Mus., Crust., p. 176, 
1882. 
Cheraps quinquecarinatus Faxon, Proc. U.S. Nat. Mus., xx, 1898, 
p. 677; Ortmann, Proc. Amer. Philos. Soc., xli, 1902, p. 291; 
Faxon, Mem. Mus. Comp. Zool., xl, 1914, p. 403 ; McCulloch, Rec. 
West. Austrl. Mus., i, pt. 3, 1914, p. 232, pi. 33. 
Chaeraps quinquecarinatus Smith, Proc. Zool. Soc. Lond., 1912, p. 165. 
Length of average adult specimen, 130 mm. 
Rostrum long and slender, three times as long as broad at base, reaching 
to end of third segment of first antennae, apex sharp, with one or two 
spines at each side; carinae sharp, carried well back on to carapace; two 
carinae on carapace at outer side of rostral carinae, and one median carina. 
Squame of each second antenna long and slender, reaching the end of 
