22 
REVISION OF THE GENUS EUASTACUS 
on upper surface below base of dactylus. Dactylus stout, a row of small 
spines along the upper margin, and a group of small sharp spines near 
apex, apex sharp, cutting edge with four large and a few small tubercles, 
two or three small spines in a row above the cutting edge. Carpus with 
two or three large sharp spines on upper margin, upper surface deeply 
grooved. Merus with three large and two small spines along the upper margin. 
Pereopods armed with numerous long, slender sharp spines. 
Habitat. — New South Wales: Blue Mountains, caught in streams leading 
to Horseshoe Falls and Bridal Veil Falls, above the Falls, (Melbourne 
Ward) ; Grose River, Blackheath (E. Clark) ; Swamp on top of Bulli 
Pass (Austrl. Museum); Wollongong (W. Kershaw); Parramatta River; 
Sydney (Australian Museum). 
Victoria: Bruthen (J. Barlin) ; Narracan River (W. Kershaw); Moe 
River (W. Kershaw) ; Thomson River (R. James) ; Lakes Entrance ; 
Thorpdale (W. Kershaw) ; Vereker Range, Wilson’s Promontory (J. A. 
Kershaw) ; Ferntree Gully (S. W. Fulton) ; Belgrave (S. W. Fulton) ; 
Warburton, Yarra River (F. J. Williams) ; Gordon’s Bridge, Yea River (E. 
Clark) ; Marysville, Stevenson River (E. Clark). 
In a jH'evious paper (2) kersJiawi was retained as a sub- 
species of nohilis on characters that were acknowledged to be 
slight but constant. Examination of the present compre- 
hensive series from Victoria and New South Wales has 
shown that there is no constancy, examples of both forms as 
well as intennediate forms being found in the series. There- 
fore the name kersJiawi is included under nohilis as one very 
variable species found in the coastwise rivers in New South 
Wales and Eastern Victoria. 
Great variation is shown in the armature of the carapace, 
even among specimens of the same growth stage and taken 
from the same locality. In some examples there are numerous 
small tubercles and several large flattened tubercles on each 
branchiostegite ; others have only two or three large 
tubercles on each branchiostegite ; others have large tubercles 
on only one branchiostegite; some of the examples have no 
large tubercles on the branchiostegites. 
The number of spines on the carpus varies, even on different 
appendages of the same individual. Two large sharp spines 
are found on the upper margin of the carpus of the majority 
of the specimens examined, but many have three large sharp 
spines as in the type of the species ; several examples have 
two spines on one carpus and three on the other. 
Euastacus hispinosus sp. nov. 
Plate VII. 
Length of average adult specimen 295 mm. 
Rostrum broad, reaching almost to end of third segment of second 
antennae, apex short and blunt; lateral carinae obtuse, carried well back on 
