
420 Recoxps OF THE S,A. Museom 
that more complete series of the adults of both sexes will lead to the recognition 
of three separate species. 
Even quite juvenile females of all have the lateral prominences of the dorso- 
lateral folds of the carapace; normally in the second leg the ischium (not made 
out in the type) ig distinct, though it is short aud collar-like; the wide basis is 
always distinctly shorter than the rest of limb and the propodus is shorter than 
the dactylus. The second antenna of the female is four-jointed the first segurent 
as long as second and third together, the fourth small, - 
Tasmania. A young male and female, and a female with developing mar- 
supium have the carapace as shown m fig. 45, A; the dorso-lateral folds are much 
as previously illustrated for the ovigerous female, although the most anterior of 
their lateral projections are Jess swollen; the rounded clevation near hinder 
margin on each side, however, is here strikingly different, being greatly enlarged, 
while the fourth pedigerous somtite has the pair of dorso-lateral ridges swollen 
and elevated. The carapace and lateral parts of pedigerous somites beat distinct 
granules. Apart from the chatacter of the carapace the juvenile male differs from 
the young male previously recorded, and from the adult male described below, 
in having the endopod of the uropod distinctly three-jointed instead of two, 
Spencer Gulf, South Australia. An ovigerous female has the integument 
indurated but translucent, quite unlike that of the white or pearly exoskeleton 
of the type examples and the Tasmanian specimens; it has the anterior part of 
the dorso-lateral fold of carapace somewhat swollen ag in the type, but the 
posterior portion is cristate, projecting laterally and overhanging the not very 
conspicuous tumidity on the side (fig. 45, B) ; the curved ridge which runs forward 
from the last-named elevation is low and rounded in the examples previously 
recorded and in the Tasmanian material, but in this female it is almost. cristate 
and is visible when the animal is viewed from above; the lateral concavity is 
more pronounced than in the types. The second to fourth pedigerous somites 
have the dorsum elevated transversely and produced on each side to form 4 dorso- 
lateral tumidity which is almost cristate on the fourth somite. 
The only fully mature males in hand were taken in this Gulf. 
Adult male, Integument finely granulate, calcified, but semi-transparent. 
Carapace one-third of total length of animal and two-thirds as long again 
as pedigerous somites together; it is less than twice as long as deep, and is 
broader than deep because of the great prominence of the lower lateral ridge (see 
fig. 45, CG); the three dorgo-lateral projections are much developed, as is also ths 
elevation lower down on side of carapace from which curves forward the lower 
earina, Antero-lateral margin excavate to form a distinet antennal notch; 
antenna! angle obtuse, the margin below broadly rounded, Pseudorostrum slightly 
downbent (thus foreshortened in fig. £5, C.) obliquely truncate anteriorly ; lobes 
meeting for a distance equal to more than one-fifth of length of carapace, Frontal 
lobe with sutures fused; ocular lobe large and tumid, twice as wide as long, with 
three prominent pale lenses. 
The large fourth pedigerous somite has a pair of dorsal tumidities. 
Pleon as long as cephalothorax; telson about as long as sixth somite, with 
post-anal portion rather more tapered than in female and with two apical spines, 
flanked by a pair of bristles inserted infero-laterally; lateral serrations small, 
but distinet. 
As in the female the last peduncular joimt of the first antenna is rather long; 
both flagella appear to be three-jointed (see fig. 45, ant. 1), and the accessory is 
mot much shorter than the main lash. 
The second antenna is so generously furnished with sensory hairs that the 
