REVISION OF THE GENUS EUASTACUS 17 
deeply grooved, flattened; processes between fourth pereopods short and 
stout. 
Abdomen spinose. First segment with a long slender sharp spine on each 
lateral lobe, and a short broad obtuse spine above it. Second segment with 
three long spender sharp spines along each lateral margin; a long slender 
sharp spine above the lateral spines, and a short broad obtuse spine above it. 
Third, fourth and fifth segments each with a long slender sharp spine at each 
lateral margin ; two rows of long slender sharp spines and a short broad 
obtuse spine above the lateral spines. Sixth segment with two long slender 
sharp spines near lateral margins, and several small sharp or obtuse spines 
on the upper surface. 
Telson longer than broad, almost completely divided by a transverse suture; 
a spine on each lateral margin at suture, and one or more spines above it; 
numerous small sharp spines on calcareous portion of telson, three or four 
small sharp spines on membranous portion. Inner rami of uropods each 
with a spine on outer lateral margin near posterior margin, and two or three 
small sharp spines along the obsolete median carina, carina ending in a small 
sharp spine near posterior margin. Outer rami of uropods each with numerous 
small sharp spines along the transverse suture, numerous small sharp spines 
along the outer margin of each ramus. Lobes at base of uropods without 
spines. 
Great chelae stout, propodus twice as long as broad, upper margin with 
four blunt spines, lower margin with a row of small sharp spines and a row 
of small blunt spines, apex sharp, cutting edge with two large tubercles, and 
several small tubercles ; dactylus stout, three or four small spines along upper 
margin, apex sharp, cutting edge with numerous small tubercles. Carpus 
with two long sharj) spines on upper margin, upper surface deeply grooved. 
Merus with two large and a few small sharp spines along the upper margin. 
Habitat. — Neiv South Wales: National Park (L. G. Russell) ; Sydney (E. 
M. Stephen) ; Baulkham Hills, near Parramatta (A. R. McCulloch) ; Yarra- 
malong Mount, near Gosford (J. H. Wright and W. Barnes) ; Berowra 
Creek, near Hornsby; Ourimbah, near Gosford; Wahroonga; Fitzroy Falls, 
Kangaroo River (Melbourne Ward), caught in streams above the falls. 
Blue Mountains (N.S.W.): Pools below Govett’s Leap (M. Ward); Wall’s 
Cave (E. Clark); Blackheath (E. Skehan). 
The armature of the carapace and abdomen distinguishes 
this species from each of the other members of the genus, the 
very slender sharp spines on the abdomen being the main 
characteristic. 
The specimens from the vicinity of Sydney are dark green 
or brownish green, but the specimens from the localities in the 
Blue Mountains are a vivid shade of red. 
Euastacus hirsutus (McCulloch) 
Astacopsis serratus var. hirsutus MJcCulloch, Records Austrl. Mus., no. 
11, 1917, p. 238, pi. 43. 
Euastacus serratus s.sp. hirsutus (McCulloch), Clark, Mem. Nat. Mus. Viet., 
X, 1936, p. 14, pi. ii, fig. 14. 
Length of largest specimen 92 mm. 
Rostrum slender, reaching to base of the third segment of first antennae, 
apex blunt; carinae blunt, with three or four small blunt spines along each 
