48 
FRESHWATER AND LAND CRAYFISHES OF AUSTRALIA 
Pseudengaeus sternalis sp. nov. 
(PI. IX, fig. 41.) 
Length of adult specimens, 47 mm. 
Rostrum broad, almost as broad at apex as at base, reaching nearly to base 
of second segment of first antennae; carinae blunt, reaching to apex. 
Eyes very large. Squame of each second antenna rudimentary, represented 
by a very small blunt spine. Interantennal spine small and slenderly pyri- 
form. Exopod of each third maxilliped indicated by a small papilla. 
Carapace as long as abdomen. Cervical groove and branchio-cardiac 
grooves obsolete, areola fairly broad. Anterior of carapace covered with 
short, soft down, very dense about rostrum. 
Sternal keel narrow from great chelae to third pereopods, very broad and 
swollen between third and fourth pereopods; posterior pair of lateral pro- 
cesses small, low and flattened, crenulate on posterior margin; sternum below 
large and swollen, overhanging fourth pereopods. 
Great chelae: propodus twice as long as broad, densely punctate, upper 
and lower margins smooth ; dactylus short and stout, upper margin smooth, 
two small tubercles on cutting edge. Carpus punctate, three small tubercles 
on upper margin ; upper margin of merus smooth. 
Pereopods very slender, particularly posterior pair. 
Telson narrowly cone-shaped, without spines; uropods large and round, 
inner rami each divided by a longitudinal median carina, continued to posterior 
margin, without spines; outer rami each divided by a longitudinal median 
carina, transverse suture feebly serrated. 
Habitat. — Victoria: Warragul (J. A. Kershaw). 
Type in the National Museum, Melbourne. 
Readily separated from P. strictif irons by the form of tlie 
sternal keel and by the rudimentary squame. 
Genus PARASTACOIDES gen. nov. 
Carapace as high as broad, minutely tuberculate. Cervical groove deeply 
impressed, rounded. Abdomen without spines, lateral margins rounded. First 
somite with lateral lobes large and rounded. 
Telson without transverse sutures, entirely calcareous. Sternal keel narrow, 
flat or slightly rounded. Upper lip short and broad, straight or slightly con- 
cave medianly. Vas deferens on simple short papillae on coxae of fourth 
pereopods. 
Stem of podobranchs without wing-like expansions; no pleurobranchs 
present ; posterior arthrobranchs rudimentary. 
Genotype Astacus tasmanicus Erickson. 
Parastacoides tasmanicus (Erichson). 
(PL VII, fig. 30.) 
Astacus (Astacus) tasmanicus Erichson, Arch. f. Naturg., xii, p. 94, 
1846. 
Astacus tasmanicus White, List Crust., Brit. Mus., p. 72, 1847; von 
Martens, Monats. Akad. Wiss. Berlin, 1868, p. 618. 
Astacopsis tasmanicus Haswell, Cat. Austrl. Mus., Crust., 1882, p. 178; 
Ortmann, Proc. Amer. Phil. Soc., xli, p. 292; Faxon, Mem. Mus. 
Comp. Zook, xl, 8, p. 402, 1914 ( Incertac sedis). 
