42 FRESHWATER AND LAND CRAYFISHES OF AUSTRALIA 
guished by the form of the great chelae and the sternal keel ; 
E. cunicularius appears to be confined to Tasmania. Speci- 
mens from King Island differ from the mainland form in 
having the great chelae and pereopods covered by long, stout 
setae, but there are no other characters to separate the two 
forms. 
Forty-two specimens examined. 
Engaeus fossor Erichson. 
(PI. I, fig. 9; PI. VIII, fig. 31.) 
Astacus (Engaeus) fossor Erichson, Arch. f. Naturg, xii, 1846, p. 102. 
Astacus fossor von Martens, Monats. Akad. Wiss. Berlin, 1868, p. 618. 
Engaeus fossor Haswell, Cat. Austrl. Mus., Crust., p. 178, 1882; Faxon, 
Proc. U.S. Nat. Mus., xx, p. 676, 1898; Ortmann, Proc. Amer. 
Phil. Soc., xli, p. 292, 1902; Smith and Schuster, Proc. Zool. Soc. 
Lond., 1913, p. 119; Faxon, Mem. Mus. Comp. Zool., xl, 8, p. 403, 
1914; Clark, Viet. Nat., liii, 1936, p. 66, fig. 2. 
Engaeus fultoni Smith and Schuster, Proc. Zool. Soc. Loud., 1913, 
p. 126. 
Length of average adult specimen, 55 mm. 
Rostrum narrow, apex blunt; carinae sharp, carried well back on to 
carapace. 
Eyes large. Inner flagella of first antennae seven-eighths as long as 
outer. Squame of each second antenna small, bluntly pointed, inner lobe 
narrow. Interantennal spine short and narrow, bluntly pointed. Exopod 
of each third maxillipede usually long and slender, on some examples indi- 
cated by a small papilla. 
Carapace punctate, as long as abdomen; cervical groove and branchio- 
cardiac grooves feebly impressed, areola broad. 
Sternal keel (PI. I, fig. 9) raised and very sharp; first two pairs of 
lateral processes small, third pair larger and sharp, posterior pair small and 
blunt, slightly grooved ; a conspicuous opening present on each lateral process ; 
processes between fourth pereopods long and stout, not joined above. 
lelson narrowly cone-shaped, with a spine on lateral margins; uropods 
rounded, with a longtiudinal median carina ending in a sharp spine almost on 
posterior margin, inner rami each with a spine on outer lateral margin; 
outer rami each with several small spines along transverse suture. 
Great chelae punctate; propodus one and one-half times longer than 
broad; two rows of large tubercles on upper margin, lower margin with a 
single row of tubercles ; dactylus curved, with one tubercle on cutting edge, 
upper margin with three longitudinal grooves reaching from apex to base; 
cutting edge of propodus with three tubercles, margined by a smooth carina, 
lower margin with a distinct carina; carpus and merus each with a row of 
tubercles on upper margin. 
Posterior pleurobranch well developed. 
Habitat. — Tasmania: Smithton (R. H. Champion, 1935) ; Clayton Rivulet 
(E. Scott, 1934) ; Pioneer Mine, Derby ; Muddy Creek, Bridport. Victoria: 
Otway Ranges (W. Groves, 1934) ; Ferntree Gully. 
Types in Berlin Museum. 
