
372 RECORDS OF THE S.A. MUSEUM 
GYNODIASTYLIS DILATATA Sp. NOV. 
Adult male. Integument lightly calcified, brittle, and with reticulate pattern- 
ing of carapace distinct, the fine surface sculpture becoming imbricate on the pleon. 
Carapace a little less than one-third of total length of animal and twice as 
long as pedigerous somites together; it is much depressed, being almost half as 
wide again as deep and is two-thirds as long again as deep; there is a sharp, curved 
dorso-lateral ridge on each side, partly encircling the front lobe and meeting a 
Jongitudinal carina which runs from hinder corner of frontal lobe to postertor 
margin of carapace; on the frontal lobe and for some distance posterior to it the 
dorsum is medianly ridged, but towards the rear end it is suleate between the 
slightly tumid branchial regions ; there is a short dorsal ridge on each pseudorostral 
lobe, extending from apex to ocular lobe; on the side is an extensive shallow hollow, 
margined below by a sharply elevated carina extending from antennal angle to 

Fig, 9. Gynodiastylis dilatata, type wale; Jstersi view and cephalothoraxs from above 
(™ 35), 
posterior margin, Antero-lateral margin very shallowly concave; antennal angle 
acute and margin posterior to it very finely serrate, Pseudorostral lobes sub- 
truneate in front and shallowly excavate, meeting for a distance equal to one- 
seventh of length of carapace. Frontal lobe distinctly marked off; ocular lobe 
more than twice as wide as long and less than one-fourth greatest breadth of cara- 
pace; it has three not very large lenses. 
First to fourth pedigerous somites stecessively increasing in dorsal length; 
second to fourth with a pair of dorso-lateral carinae, first with similar but fainter 
eavinae, and fifth with a pair of dorso-lateral tumidities; third somite moderately 
produced fore and aft on the sides, but second and third legs separated by an 
interspace no greater than that between any of the others, 
Pleon distinetly longer than cephalothorax, the distal somites rather slender ; 
fifth fully half as long again as sixth, which is scarcely at all dilated posteriorly, 
where it. is as wide as long; telson narrowly cordate, longer than sixth somite but 
shorter than fifth, and with fully one-third of its length post-anal ; it is armed with 
