
410 RECORDS OF THE S.A. MUSEUM 
posteriorly, where it is fully as broad as long; telson three-fourths as long as 
sixth somite, cordate, tapering in distal third to the narrowly rounded apex, which 
bears a pair of short spines, flanked on each side by a bristle; quite one-fourth 
of the dorsal plate is post-anal. 
First antenna long, with basal joint of peduncle distinctly shorter than second 
and third combined; third about one-third as long again as second; both flagella 
¢wo-jointed, the main lash only one-fourth as long as the last peduncular segment, 
the accessory not as long as the first joint of the other. Second antenna as long 
as first joint of peduncle of first antenna; it is four-jointed, the last segment tiny, 

Fig. 37. Gynodiastylis margarita, type female; lateral view and cephalothorax from above. 
ceph., Cephalothorax of allotype subadult male from the side (all X 21). 
the third much longer than second and the first (which has a distal tooth) as long 
as second and third together (in the figures the two antennae are not shown to 
the same scale). 
Mandible with nine or ten spines in the row. 
Third maxilliped short and stout; basis a little shorter than rest of limb, 
distally dilated and a little forwardly produced externally, where the usual setae 
are stout and long; ischium, merus, and carpus wide; carpus, propodus, and 
dactylus subequal in length, each longer than either ischium. or merus. 
First peraeopod, when extended, reaching little beyond apex of pseudo- 
rostrum, its merus not quite attaining to level of antennal angle; basis about two- 
thirds as long as rest of limb, serrate on inner edge; propodus subequal in length 
to carpus, with a long and a short inner seta at distal end; dactylus barely more 
than half as long as propodus, with one of the terminal setae stout and as long 
as the joint; exopod slender. 
Second peraeopod about two-thirds as long as first; basis stout, shorter than 
the slender exopod and less than two-thirds as long as remainder of limb; ischium 
suppressed ; merus with a small distal tooth; carpus fully two and one-half times 
