20 
REVISION OF THE GENUS EUASTACUS 
antennae, apex blunt; lateral carinae rounded, each with three or four 
tubercles; a punctate carina, ending in a small tubercle, at base of each carina. 
Second antennae reaching base of telson ; squame smooth, inner lobe 
broad, terminal spine sharp. Interantennal spine long and narrow, sharply 
pointed, margins serrated. 
Carapace twice as long as broad, broader than high, somewhat shorter 
than abdomen. Branchiostegites studded with numerous small tubercles. 
First abdominal segment with a long sharp spine on lateral lobes; second 
segment with four or five sharp spines on each lateral margin; remaining 
segments each with one spine on each lateral margin. There are no other 
spines or prominences on abdomen. 
Telson longer than broad, almost completely divided at posterior third 
by a transverse suture, posterior third membranous; a small spine on each 
lateral margin at suture, without other median or lateral spines. Inner 
rami of uropods with an obsolete median carina ending in a small blunt 
spine almost on posterior margin, a small blunt spine at posterior third 
of outer margin. Outer rami each with numerous small spines along the 
transverse suture. Lobes at base of uropods without spines. 
Sternal keel moderately sharp; first pair of lateral processes small and 
round, increasing in size and sharpness to posterior pair, these large and 
deeply grooved. 
Great chelae stout, propodus more than twice as long as broad, upper 
margin with four small blunt spines, cutting edge of propodus with one 
large and three or four small tubercles, lower margin with one or two 
rows of small tubercles, several small tubercles on upper surface of propodus. 
Dactylus with two or three small tubercles on cutting edge, upper margin 
smooth, several small tubercles on upper margin above the cutting edge. 
Carpus with four or five sharp spines along upper margin, upper surface 
flat; merus with four or five small spines on upper margin. 
Habitat. — Queensland'. Root’s Creek (type locality); Mossman River 
and Its tributaries; Daintree River. 
Readily separated from E. nohilis (Dana) by the absence 
of spines or tubercles from the dorsnm of the abdominal seg- 
ments, the absence of spines on the telson and uropods, and by 
the form of the carpus. 
In the description of the great chelae, Mem. Nat. Mus. Viet., 
X, 1936, p. 18, a printer’s error occurs. The description of the 
propodus is cut short at the phrase ‘ ‘ cutting edge of propodus 
with one large and 3 or 4 small tubercles” and is followed by 
the end of the description of the dactylus beginning with the 
phrase “on cutting edge, upper margin smooth.” The 
corrected description is given above. 
Euastacus noMUs (Dana). 
Plate VI. 
Astacoides nobilis Dana, U.S. Explor. Exped., Crust., pt. 1, 1852, p. 526, 
pi. 33. 
Astacoides nobilis Dana, Hess, Archiv. f. Naturg., xxxi, 1865, p. 164; 
Heller, Reise Novara, Zook, ii, pt. 3, Crust., 1865, p. 101 ; von Martens, 
Ann. Mag. Nat. Hist., ser. 3, xvii, p. 360, 1866. 
