
48 RECORDS OF THE S.A. MUSEUM 
HEMICYCLOPS AUSTRALIS Sp. nov. 
Occurrence. [X, 1 female, 1 male; XI, 2 females, 1 male. 
Female. Length 1-38 - 1-40 mm. The body has the usual shape and pro- 
portions found in the genus; the genital segment is swollen and rounded anteriorly 
with lateral projections behind the swollen portion, and is longer than the rest 
par. 


\ 
lt. 
Fig. 21. Hemicyclops australis sp. nov., oral area seen from below X 450. In the process 
of dissection the left maxilla and maxilliped were removed, and the maxillule slightly displacea 
posteriorly from its natural position. On this side the base of this appendage and its position 
of attachment are clearly seen. On the right side the appendages occupy their normal positions. 
It is of interest to note that paragnaths (par.) are present and that the mandible and maxillule 
are distinct appendages. 
re, 
of the urosome; the anal segment is the shortest; the caudal rami are sub-rect- 
angular, almost as wide as long and longer than the anal segment. The first an- 
tenna is 7-segmented ; the second antenna has the two proximal segments long and 
sub-equal, the third segment is short and has a lateral swelling, and the terminal 
segment is short and sub-rectangular, wider than long. The upper lip is of a dis- 
tinctive shape and armed with marginal spines; the mandible is armed with a 
large terminal toothed ‘‘elaw,’’ a wide lamellar toothed plate and two setae, one 
of which is strongly built, the other much more slender; the maxillule is clearly 
bilobed, the inner lobe bearing a strong spine and three setae, the outer armed only 
with setae; the maxilla is two-segmented, the basal segment bears a long double 
