32 
FRESHWATER AND LAND CRAYFISHES OF AUSTRALIA 
Telson entirely calcareous, with a spine on each lateral margin at apical 
third ; inner rami of uropods each divided by a longitudinal median carina 
reaching almost to posterior margin; outer rami each divided by two longi- 
tudinal median carinae, transverse suture placed at apical third, several small 
sharp spines along suture. Lobes at base of uropods with lower lobe produced 
to a small spine. 
Pereopods very slender, especially fourth pair. Great chelae short and 
slender ; propodus more than twice as long as broad, punctate, upper margin 
serrated, lower margin smooth ; apex sharp and incurved, cutting edge with 
one large tubercle ; dactylus one-half as long as propodus, stout, upper 
margin smooth, sharply curved on cutting edge, apex sharp and incurved. 
Carpus densely punctate, upper margin serrated; upper margin of merus 
serrated. 
Habitat. — Victoria: Gellibrand River, south of Colac (type locality) 
(W. H. F. Hill); Portland (L. R. Kurtze, 1935). Kangaroo Island (Sth. 
Aust. Museum, 1936). 
Types in National Museum, Melbourne. 
A well-graduated series of 68 specimens examined. 
Geocharax lyelli sp. nov. 
(Text fig. 1.) 
Length of largest specimen, 62 mm. 
Rostrum broad, reaching to base of second segment of first antennae, apex 
blunt ; carinae sharp, straight, carried well back on to carapace ; lateral 
carinae obsolete. 
Second antennae slender, reaching to base of telson; squame large, very 
broad anteriorly, terminal spine short and sharp. Interantennal spine short 
and broad, apex sharp. Eyes small. Median arch of upper lip smooth. 
Carapace higher than broad, more than twice as long as broad, shorter 
than abdomen. Cervical suture deeply impressed, rounded ; branchio-cardiac 
grooves obsolete, areola broad. Entire carapace studded with minute 
tubercles. 
Fig. 1. Geocharax lyelli sp. nov. 
