20 
FRESHWATER AND LAND CRAYFISHES OF AUSTRALIA 
Four carinae on carapace. 
Squame of second antennae long and slender. 
Great chelae long and slender, propodus three times as long as broad, 
dactylus long and slender 
QUADRICARINATUS (von Martens) 
Rostrum twice as long as broad at base, apex sharp. 
Two carinae on carapace. 
Squame of second antennae not broad anteriorly. 
Sternal keel very sharp. 
Great chelae long and stout, propodus two and one-half times as 
long as broad, dactylus short and stout, with a tubercle in 
centre of cutting edge BICARINATUS (Gray) 
Great chelae slender, propodus two and one-half times as long as 
broad, dactylus long and slender 
s.sp. ANGUSTUS (McCulloch) 
Rostrum twice as long as broad at base, apex sharp. 
Two carinae on carapace. 
Squame of second antennae very broad anteriorly. 
Sternal keel moderately sharp, without conspicuous opening on 
lateral processes DESTRUCTOR sp.nov. 
Sternal keel blunt, with conspicqous openings on lateral processes 
ALBIDUS sp.nov. 
Rostrum slightly longer than broad at base, apex rounded. 
Two carinae on carapace. 
Sternal keel very sharp ; lateral processes below second and third pereo- 
pods produced into conspicuous openings . PUNCTATUS sp.nov. 
Cherax tenuimanus (Smith). 
(PI. IV, fig. 18.) 
Chaeraps tenuimanus Smith, Proc. Zool. Soc. Lond., 1912, p. 166, pi. 
22; 27, fig. 30. 
Cheraps tenuimanus McCulloch, Rec. West. Austrl. Mus., i, pt. 3, 1914, 
p. 233, pis. 34, 35. 
Length of average adult specimen, 375 mm. 
Rostrum long and slender, four times as long as broad at base, reaching to, 
or beyond, end of third segment of second antennae, carinae sharp, each with 
from three to six spines; two carinae on carapace at outer side of rostral 
carinae, and one median carina. 
Squame of second antennae long and slender, reaching well beyond the 
end of third segment of second antennae, terminal spine short and sharp. 
Interantennal spine short and broad, bluntly pointed. 
Carapace shorter than abdomen, cervical suture deeply impressed, areola 
broad; branchiostegites covered with numerous small obtuse spines and 
tubercles, a row of sharp spines behind cervical suture. Anterior of carapace 
with numerous small tubercles, a row of obtuse spines reaching from 
interantennal spine to cervical suture. Entire carapace densely hirsute. 
Sternal keel highly raised, broad and blunt, serrated into four large blunt 
tubercles, a sharp backwardly directed spine below great chelae. First three 
pairs of lateral processes obsolete, fourth pair large and flattened, shelf below 
