
402 RECORDS OF THE S.A. MUSEUM 
Second antenna with the ten-segmentate flagellum not much longer than 
the peduncle. Upper lip narrower than in female. 
Second peraeopod with basis much longer than rest of limb and with dactylus 
less than twice as long as propodus. 
Third and fourth peraeapods both with exopods, which are only about two- 
thirds as long as those of first and second legs, but which bear long plumose setae; 
distal carpal seta and propodal seta more slender than in female. 
Pednnele of uropod not quite as long as telson and with a short bristle and 
spine near distal end of inner edge; rami as in fémale but a couple of extra spines 
on endopod. 
Colour white. Length 2-63 mm, 
Loc. New South Wales: Ulladulla, Brush Island, 45 fath., in fine ailt on 
flathead grounds. (D. Rochford, Jan., 1945). Types in South Australian Museum, 
Reg. No, ©. 2692 and 2714. 
The female described above is quite transparent, the embryos easily visible 
through the marsupial plates. The male, although small, seems to be mature, for 
the second antennae bear dense sensory setae and the exopods of the third and 
fourth legs have the flagellal setae long. 
It may be said of the adults of this species that the telson tapers to an acute 
Point without apical spines, the character by which Calman separates his 
Oxyurostylis from Diastylis (see Calman, 1912, p, 666 and Zimmer, 1936, p. 437). 
Ta G. mutabilis, however, the condition resolts from a prolongation of the apex 
of the telson over and beyond the bases of what normally would be the terminal 
spines (see tels, in fig. 32) whereas in Oxyurostylis the last of the pairs of spines 
are troly lateral, which does suggest a suppression of the terminal spines com- 
bined with a narrowing of the apex. In the male of Paradiastylis culicoides Kemp 
( qBts, p. 398, fig. 5) there is a median, spine-like posterior prolongation of the 
telson, 
In addition to the above specimens, there is before me a young female, with 
fifth legs as yet quite undeveloped, and which I think belongs without donbt 
to this species. This example, however, exhibits some interesting differences and 
is therefore deseribed and figured in some detail. 
Juvenile female, Totegument calcified, but thin and brittle. 
Carapace not quite one-third of total length of animal and twice as long as 
pedigerous somites together ; it is robust, deeper than wide and less than half as 
long again as deep; dorso-latera) ridge on each side armed with two or three 
denticles and dorsal longitudinal carina. on each psendorostral lobe faint; frontal 
lobe with a concavity on each side, the space between with two pairs of teeth; 
posterior ta the frontal lobe is a pair of longitadinal dentate carinae; sides smooth 
excepting for large pits arranged as shown in figure, one series forming a curved 
line from posterior end of frontal lobe to antero-lateral portion of carapace; 
antero-lateral margin widely rounded and strongly dentate, fig, 31, c. pace); a 
small but distinct antennal notch. Pseudorostral lobes irregularly subtruneate 
in front, the distal ends of the aforementioned carinae projecting as small points; 
meeting for a distance equal to about one-sixth length of carapace, Ovnlar lobe 
wide and extremely short, armed with a tiny tocth on each side and without 
apparent lenses. 
First three pedigerous somites short and crowded dorsally ; second moderately 
expanded fore and aft, and the third peraeopods not widely separated; second 
and fourth with a pair of dorsal spines, third somite with two obsolete spines. 
First five pleon somites armed with dorso-lateral teeth, and each with a median 
ridge on underside, flanked at posterior margin by a pair of curved, almost spine- 
