REVISION OF THE GENUS EUASTACUS 
19 
Carapace densely punctate, almost twice as long as broad, slightly broader 
than high, as long as abdomen. Branchiostegites densely studded with small 
tubercles. Cervical groove very deep ; branchio-cardiac grooves prominent ; 
areola broad. 
Abdomen spinose. First segment with a long slender sharp spine on each 
lateral lobe, and usually another small spine above each lateral spine. Second 
segment with three or four long slender sharp spines along each lateral 
margin ; and three or four rows of short, sharp spines above them. Segments 
three, four, five and six each with one long slender sharp spine near the 
lateral margin, and several rows of short, sharp spines above the lateral 
spines, the spines numerous on dorsum of each segment. The number of 
rows of spines varies considerably on both sides of each segment on each 
of the specimens examined. 
Telson long, partly divided at middle by transverse suture, posterior half 
membranous, a row of three or four sharp spines along each lateral margin 
of calcareous portion, and numerous small sharp spines on upper surface. 
Uropods longer than telson, membranous portion relatively long; inner rami 
each with five or six sharp spines along the outer lateral margin, median 
Carina feeble; outer rami each with numerous small blunt spines along the 
transverse suture, median carina obsolete. Lobes at base of uropods without 
spines. 
Sternal keel very slender and sharp ; lateral processes almost upright, 
slender and sharp, increasing in size and sharpness from first to fourth, 
posterior pair deeply grooved; processes between fourth pereopods long 
and slender. 
Pereopods slender. 
Great chelae stout, propodus slightly more than twice as long as broad, 
four small sharp spines along the upper margin, lower margin with an anterior 
row of small obtuse spines along a prominent carina, and a posterior row of 
relatively large sharp spines; cutting edge of propodus with three or four 
large tubercles and several small tubercles, an obtuse spine on the upper 
surface of propodus at base of cutting edge; several small tubercles in a 
group near lower margin. A row of three or four sharp spines on underside 
of propodus from base of dactylus towards carpus. Dactylus with three 
or four large tubercles and several small tubercles along cutting edge, three 
or four small sharp spines along upper margin. Carpus stout with three 
large sharp spines on upper margin, upper surface deeply grooved; merus 
with a few small sharp spines along the upper margin. 
Habitat. — Queensland: Wyberba (E. Sutton). 
The armature of the abdomen and the form of the rostrum 
separate this species from other members of the genus. The 
numerous small sharp spines, irregularly placed on the 
abdomen, are very distinctive. 
Euastacus fleckeri (Watson). 
Astacopsis fteckeri Watson, Mem. Queensland Mus., x, pt. v, 1935, p. 2.32, 
pi. xxxiv; I.C., xi, pt. 1, 1936, p. 52; Flecker, Nth. Queensland Nat., iv, 
41, 1936, p. 18. 
Euastacus fleckeri f Watson), Clark, Mem. Nat. Mus. Viet., x, 1936, p. 17, 
pi. 3, fig. 17. 
Length of largest specimen examined 210 mm. 
Rostrum short and broad, reaching base of third segment of second 
