36 FRESHWATER AND LAND CRAYFISHES OF AUSTRALIA 
of the great chelae. A. franklinii is represented in the 
National Museum collections by six specimens, the largest 
measuring 100 mm. from tip of rostrum to end of telson. Gray 
does not give the size of his types. Drawings of A. franklinii 
and A. gouldi were sent to Dr. Isabella Gordon at the British 
Museum for comparison with Gray’s types, and in her notes 
on franklinii , accompanied by sketches, Dr. Gordon writes 
that the larger of the two type specimens is complete and 
measures just under five inches from tip of chela to end of 
telson. The smaller specimen is damaged. 
Gould (1870) gave an account of the habits and distribu- 
tion of this species, and remarked on the fact that, in spite 
of its great size and the ease with which it is captured, it did 
not appear to be named. 
Astacopsis tricornis sp. nov. 
(PI. I, fig. 7; PI. VII, fig. 29.) 
Length of largest specimen examined, 105 mm. 
Rostrum narrow, one and one-half times as long as broad at base ; 
carinae blunt, with three or four tubercles ; apex of rostrum and carinae each 
produced into a long bluntly-pointed spine ; a small tubercle present at base 
of carinae, with a large rounded boss posterior-laterally. 
Eyes large. Squame of each second antenna smooth, reaching to end of 
third segment of first antennae, broad and sharply pointed. Interantennal 
spine short and broad, apex long and sharp, surface concave, lateral margins 
serrated. 
Carapace shorter than abdomen, as high as broad, slightly more than twice 
as long as broad ; cervical groove deeply impressed, branchio-cardiac grooves 
feeble, areola broad. Branchiostegites and anterior of carapace with several, 
scattered small tubercles ; otherwise smooth. 
Sternal keel (PI. 1, fig. 7) blunt; lateral processes erect, slender and 
sharp, posterior pair deeply grooved; a large deep opening under lateral 
processes, largest on third and fourth pairs; process between fourth pereo- 
pods long and stout. 
First abdominal segment with a small spine on each lateral lobe ; second 
segment with four small spines along each lateral margin ; lateral margins of 
all following segments each produced to points. A row' of small blunt tubercles 
on dorso-lateral margins of each segment; abdomen otherwise smooth. 
Telson slightly longer than broad, without trace of transverse suture, with a 
spine on each lateral margin near posterior margin. Uropods rounded, as 
long as telson, inner rami each divided by a feeble longitudinal median carina 
ending in a blunt spine near posterior margin; outer rami each with trans- 
verse suture at apical third, one large and several small spines along suture; 
lobes at base of uropods rounded, without spines. 
Great chelae: propodus two and one-half times as long as broad, upper 
and lower surface with a few scattered punctures; upper margin with six 
sharp spines, lower margin with a double row of small sharp spines, cutting 
edge with three small tubercles; dactylus with a double row of small blunt 
spines on upper margin, and two small tubercles on cutting edge ; one large 
