NOTES ON THE CRAYFISHES. 
ASTACOPSIS AUSTRALASIENSIS (Milne Edwards). 
Astacus australasiensis M. Epw., Hist. Nat. Crustacés, 1837, 2, p. 332, pl. 24, f. 1-5. 
There are two cotypes of this species in the Museum of Natural History 
in Paris. One of these, a female, has been kindly loaned to me by Prof. E. L. 
Bouvier. The rostrum of this specimen is long-triangular, excavated, the 
acumen provided with an upturned, blunt, apical denticle and a similar denticle 
on each side; behind the lateral denticles the margins of the rostrum are obscurely 
crenate. The post-orbital ridges terminate anteriorly in a blunt tubercle; 
they are channelled throughout their length and are followed by two obsolescent 
tubercles at a little lower level on the gastric region; the hepatic area also is 
tuberculated and a few less prominent tubercles are visible on the posterior 
margin of the cervical groove on each side of the carapace. The areola is broad, 
narrowing from before backward, punctate. Branchial regions obsoletely squa- 
mose. Abdomen rather smooth, with a submarginal row of small tubercles on 
the pleura of the second somite; pleura rouhded. Spine on dorsal face of inner 
branch of posterior abdominal appendages submarginal. Antennal scale of 
moderate width, flanked with a sharp denticle on the outer side at the base. 
Anterior process of the epistome triangular, with convex sides, ending anteriorly 
in an attenuated angle. Chelipeds nearly symmetrical, meros armed below 
with spines biserially disposed, upper margin thereof also furnished with a few 
(three or four) spinules; upper margin of carpus armed with two prominent 
spines, the distal the larger; outer face furrowed longitudinally, slightly tubercu- 
late along the upper edge of the furrow; inner face of the carpus somewhat 
tuberculate and armed with one spine in the middle of the distal border. Propo- 
dite distinctly carinate on the upper border, less distinctly so on its lower border; 
the superior crest is cut into five teeth, the lower margin is denticulate; the outer 
face of the propodite is thickly covered with depressed tubercles. Dactylus 
furnished with one denticle near the proximal end of the upper border. Length, 
63 mm.; length of carapace, 30.5 mm.; breadth of carapace, 13 mm.; length of 
areola, 9 mm.; breadth of areola at anterior end, 6 mm., at posterior end, 4.5 
mm.; length of chela, 20 mm.; breadth of chela, 10 mm.; length of dactylus, 
11.5 mm. 
Bay of Sydney, Verreaux, No. 944, 1837. 
