FRESHWATER AND LAND CRAYFISHES OF AUSTRALIA 
9 
Astacidae ( Parastacinae ) Haswell, Cat. Austrl. Mus., Crust., p. 174, 
1882; McCoy, Prod. Zool. Victoria, ii, Dec. 16, p. 225, 1888; Faxon, 
Proc. U.S. Nat. Mus., xx, p. 668, 1898. 
Parastacidae Huxley, Proc. Zool. Soc., Lond., 1878, p. 775; The Cray- 
fish, International Scientific Series, xxvii, 1880, p. 306; Ortmann, 
Proc. Amer. Phil. Soc., xli, p. 291, 1902; Smith, Cambridge Nat. 
Hist, iv, p. 157, 1909; Smith, Proc. Zool. Soc. Lond., 1912, pp. 144- 
170; Smith and Schuster, Proc. Zool. Soc. Lond., 1913, pp. 112-127 ; 
Faxon, Mem. Mus. Comp. Zool., xl, No. 8, p. 402, 1914; Hale, Hand- 
book Crust. Sth. Austrl., 1927, p. 74. 
First abdominal somite devoid of appendages in either sex. 
Podobranchs without a bilobed plaited lamina, although the stem may be 
expanded into a wing. Epipod of first maxilliped generally furnished with 
branchial filaments. 
Telson usually without transverse suture; in some cases, however, more 
or less completely divided by a transverse suture. 
Iii “The Crayfish,” p. 307, fig. 76, Huxley figured an Aus- 
tralian Crayfish (to which he assigns no name) showing a 
very distinct transverse suture on the telson; but the family 
character given on p. 256 is “The telson is never divided by a 
transverse suture. ’ ’ As three species of Australian crayfishes 
have the telson more or less completely divided by a transverse 
suture, and except in this feature and in having the abdomen 
heavily armed with spines and tubercles they do not differ 
sufficiently from others of the group to justify the erection of 
a new family, the diagnosis of the family as set out above has 
been enlarged to include them. 
Key to genera of PARASTACIDAE Huxley. 
Telson more or less completely divided by a transverse suture, membranous 
posteriorly. 
Stems of podobranchs each laterally produced into a broad wing-like 
expansion, covered by numerous hooked setae. 
Second antennae inserted at the side of first. 
Abdomen usually furnished laterally with three rows of large spines 
or tubercles ; lateral margins rounded. Lateral lobes on first somite 
large and rounded EUASTACUS gen. nov. 
Telson without transverse suture ; posterior half of telson and uropods mem- 
branous. . 
Stems of podobranchs each laterally produced into a broad wing-like 
expansion, bearing numerous hooked filaments. 
Second antennae inserted at the side of first. 
Abdomen without spines or tubercles, lateral margins rounded. Lateral 
lobes on first somite large and rounded .... CHERAX Erichson 
Telson without transverse sutures, entirely calcareous. 
Stems of podobranchs each laterally produced into a small wmg-like 
expansion, bearing a few hooked filaments. 
Second antennae inserted at the side of the first. 
