
HALE—AUSTRALIAN CUMACEA 385 
at the rear, where it is considerably wider than deep, Antero-lateral margin helow 
pseudorostrum perpendicular, not at all concave; antero-lateral angle with a tiny 
tooth, behind which are two similar denticles. Pseudorostrum nearly one-fifth 
of total length of carapace; each lobe is narrowly traneate in front with the upper 
(or inner) distal angle produced as a minute tooth which rests against its fellow 
of the opposite side. Frontal lobe moderately laree, distinetly defined; ocular lobe 
rounded, more than twice as wide as long, and with three pale lenses. 
Pedigerous somites together about three-fourths as long as carapace; suec- 
cessively increasing in dorsal length to forth, which is longer on mid-line of back 
than fifth; pleural parts of second prodneed well forwards and overlapping those 
of first; third somite expanded in front on the side (where it overlaps the second) 
and also much to the rear, the second and third legs being widely separated ; it. is 
completely fused with the fourth somite on the back and dorso-laterally, but not so 

Fig. 19, Gynodiastylis polita, type female; lateral view and cephalothorax from. above 
(X 22). 
completely on lower part of sides; there is the fine median longitudinal line on all 
somites (apparent in several species), but no real carinae or folds. 
Pleon shorter than cephalothorax, not depressed; the fifth somite is half as 
long again as wide and is one-fifth longer than the sixth somite which is little 
broadened posteriorly. where it. is as wide as long; telson about three-fourths as 
long as the fifth somite, plump, smooth and rounded with very short post-anal 
part ; the apex bears a pair of short, stout spines, a little anterior to which, on each 
side, a small bristle ig set. in a tiny incision, 
First antenna with proximal joint of peduncle a little shorter than second and 
third together ; third more than half as long again as second ; flagellum two-jointed, 
longer than second peidluncular segment; accessory flagellum elongate, nearly as 
long as first joint of main lash and apparently single-jointed, Second antenna 
with three segments not differing much in length, the setae of the last two as long 
as first antenna. 
Mandible with nine or ten spines in the row. 
Third maxilliped with palp elongate; with the appendage extended the pro- 
podus reaches to level of apex of pseudorostrim; basis about two-thirds as long 
as rest of limb, little expanded distally; merus somewhat expanded, carpus longer 
