
NICHOLLS—COPEPODA FROM SOUTH AUSTRALIA 59 
DyYSGENOPSYLLUS REEVESBYENSIS gen. et sp. nov. 
Occurrence. XV, 1 female. 
Female. Length 2-35 mm. The body has the characters of the family. The 
first antenna is reduced to an unsegmented process fringed with fine hairs. The 
second antenna is two-segmented and armed with a single, terminal, slightly 
clawed spine; this is the most fully developed appendage on the body. There ap- 
pears to be a large plate-like upper lip, with a pair of mandibles lying just behind 
it; maxillules could not be identified. The maxilla and maxilliped appear as seg- 
mented processes armed only with fine hairs. One pair of legs is present as small 
triangular processes like those of Anomopsyllus. The urosome is three-segmented, 
with the middle segment very short; the caudal rami are lobular unarmed processes. 

Fig. 28. Caligus sp., male. Dorsal and ventral views X 38; appendages X 80. /f., furea; 
1., lateral hook. 
