
50 RECORDS OF THE S.A. MUSEUM 
and maxilliped are strongly developed and show sexual differences. The maxilla 
in the female and maxilliped in the male are specialized for prehension and alter 
during development, and conversely, the maxilla in the male and maxilliped in 
the female are less developed and show little or no change in development. 
In attempting to place the genera Saphirella and Paurocope, therefore, one 
would expect to find the clue to their adult forms in the mandibles and maxillules. 

Fig. 22. ‘‘Saphirella’’ tropica Wolfenden = Hemicyclops sp., juvenile. Dorsal view X 48 ; 
urosome X 100; appendages X 300. 
In studying the plankton collected by the C. S. and I. R. Fishery Research vessel 
‘““Warreen’’ I have encountered a single specimen of a copepod apparently re- 
ferable to Saphirella and most closely resembling Wolfenden’s species tropica. I 
am indebted to Dr. H. Thompson, Chief of the Division of Fisheries, for permission 
to include a description of this specimen here. As can be seen from a comparison 
of the respective figures for ‘‘Saphirella tropica’’? and Hemicyclops australis, 
described above, the mandible and maxillule show the same structure. The ter- 
minal claw of the mandible is more nodular in the adult and the toothed plate 
more robust. In the maxillule both parts and all the armature found in the adult 
are represented in the immature form. Unfortunately, this appendage was 
mounted so that the two lobes overlap one another in the immature form, but the 
corresponding parts can clearly be made out. The maxilla and maxilliped are not 
so fully developed as in the adult, but from the structure of the latter appendage 
