
HALE—AUSTRALIAN CUMACEA 379 
GYNODIASTYLIS SUBTINIS sp. noy, 
Female with developing marsugium. Integument well calcified, brittle, with 
surface smooth and somewhat, polished. 
Carapace robust, distinctly less than one-third of total length of animal, one- 
third as long again as pedigerous somites together, as wide as, and not much 
longer than, depth; dorsum boldly arched in lateral view, sides rounded and 
slightly sinuate ag seen from above; the only sculpture is a curved furrow behind 
antero-lateral angle and the serrated inferior margin posterior to this angle. 
Antero-lateral margin shallowly and evenly concave; antero-lateral angle defined 
by the first of abovementioned serrations, Pseudorostral lobes truneate in front, 
the external apical angle forming a small tooth; they meet for a distance equal to 
about one-fifth length of carapace. Frontal lobe distinctly defined; ocular lobe 
rounded, short and broad with three pale lenses, 

( aie. 14, Gynodiastylia subtilis, type female; lateral view and cephalothorax from above 
% 25). 
Anterior pleural portions of second pedigerous somite produced forwards 
as a narrow lobe; third with similar but much deeper anterior lobe and also ex- 
tended well backwards; the second and third legs are distinctly separated (prob- 
ably widely separated in ovigerous female) ; fourth and fifth somites much longer 
dorsally than the others. 
Pleon a little longer than cephalothorax; fifth somite one-third as long again 
as sixth, which is as wide as long and. twice as long as deep; telson almost as long 
as sixth somite; tapering, but not markedly narrowed to the rear, laterally serrate, 
rounded above, and with a post-anal portion equal to about half the length of 
proximal part ; there is a pair of stout apical spines, flanked by a similar spine on 
each side; at third fourth of length there is a further lateral spine on the right side 
and nearly opposite this, on the left, a bristle. 
First antenna with third peduncular joint not much longer than second; the 
two-jointed accessory flagellum is half as long as the main lash, 
