10 
REVISION OF THE GENUS EUASTACUS 
collected, or received from other collectors. In this way a 
comprehensive series of the genus has been accumulated from 
localities not previously represented in our collections. Par- 
ticular attention was given to the Sydney district, since New 
South Wales is the type locality of seven of the species pre- 
viously described. 
Careful examination of the material revealed nine distinct 
species, each of which is described and figured in the following- 
pages. Of these, six belong to known species and three are 
new. Three species came from Sydney and the surrounding 
districts ; and as was to be expected, they are identical with 
the species described from this district early last century. 
Concerning the three species from the Sydney district, the 
first is noUlis Dana, of which the majority of the specimens 
obtained are small, the largest of them measuring up to seven 
inches in length from rostrum to telson. These specimens 
agree in every way with specimens collected in various coast- 
wise rivers in Victoria and New South Wales. The second is 
Mrsutus McCulloch ; comparison with other f onns has war- 
ranted making it a full species in place of a variety. The third 
species is serratus Shaw ; examination of the large series of 
f ully grown specimens proves that serratus Shaw and spinifer 
Heller are synonymous, and since the name serratus is unique 
for the genus, it must be retained. Several small specimens 
six or seven inches long, are identical with the description 
and figure^ of paranMittensis Spence-Bate, other specimens 
about two inches loiig are identical with the description and 
figure of Sydney ensis Spence-Bate, proving that both para- 
mattensis and sydneyensis are synonymous with serratus. 
this it is evident that there are at least three species 
of the genus found around Sydney; serratus, noUlis and 
hirsutus. The synonymy of each species is given above the 
description of the species concerned. 
The history of the nomenclature of the species found in the 
Murray Kiver and its tributaries is somewhat confusing. The 
earliest record of a crayfish from the Murray is by Gray (10) 
m 1845 when, in a paper dealing with specimens collected by 
Byre, he referred to a large species found in the Murray 
Kiver; he gaye no description, but remarked that it was “of 
a size ranpng to 4| lbs., and quite equal in flavour to the 
lobster. Ihe next record is by Blandowski (1) in 
1858; during his tour of north-western Victoria he collected 
a beautiful species of spined lobster, two other varieties of 
sawfish, and three kinds of shrimps— all found in the Murray 
