40 FRESHWATER AND LAND CRAYFISHES OF AUSTRALIA 
Kershaw, 1890) ; Trafalgar (J. A. Kershaw, 1888) ; Warragul (W. Ker- 
shaw, 1887) ; Mt. Eccles (C. E. Summers, 1929) ; Wilson’s Promontory 
(A. Clavarine, 1906) ; Warburton (F. J. Williams, 1871). 
Types in the National Museum, Melbourne. 
Smith and Schuster state that “All pleurobrancks are of 
approximately equal size, the last one not being reduced.” 
Over 30 specimens, including the types, have been examined, 
and only six specimens have the posterior pleurobraneh well 
developed, all the others having only a rudimentary pleuro- 
branch. The species is very variable, particularly in the 
length of the exopod of the third maxilliped and the sharp- 
ness of the sternal keel. 
Engaeus sericatus sp. nov. 
(PI. VIII, fig. 34.) 
Length of average adult specimen, 60 mm. 
Rostrum broad, reaching base of third segment of first antennae, apex 
blunt and straight ; in some examples apex sharp and upturned ; carinae 
sharp, not reaching apex. 
Eyes small. First antennae with inner flagella three-fourths as long as 
outer. Outer antennae reaching third segment of abdomen, squame short 
and broad, terminal spine long and sharp. Interantennal spine triangular, 
sharply pointed, surface convex. Exopods of third maxillipedes long and 
slender ; maxillipedes, exopods, and all the mouth-parts with a thick covering 
of soft downy setae. 
Carapace as long as abdomen, cervical groove and branchio-cardiac grooves 
obsolete, areola fairly broad; branchiostegities and anterior of carapace with 
numerous minute tubercles. 
Sternal keel raised and sharp; first two pairs of lateral processes small, 
third pair larger and sharp, posterior pair blunt, slightly grooved ; processes 
between fourth pereopods short and stout, not joined above; a conspicuous 
round opening present on each lateral process. 
Telson broadly cone-shaped with a spine on each posterior-lateral margin ; 
uropods rounded, same length as telson, inner rami each with a longitudinal 
median carina ending in a spine almost on posterior margin, outer lateral 
margin with a spine at posterior margin ; outer rami each with a longitudinal 
median carina, transverse suture fringed by several small spines, suture 
placed at apical third. 
Great chelae : propodus slender, two and one-half times as long as broad, 
upper surface smooth, under surface with a covering of soft downy setae; 
upper margin feebly serrated, lower margin smooth, cutting edge with one 
large and a few small tubercles; cutting edge of dactylus with a large com- 
pound tubercle; some examples with two or three simple tubercles near 
compound one ; upper margin of carpus and merus feebly serrated. 
Habitat. — Victoria : Croydon (type locality) (S. W. Fulton) ; Mortlake; 
Warragul ; Warburton ; Matlock. 
Types in the National Museum, Melbourne. 
This species is characterized by the thick covering of downy 
