
440 RECORDS OF THE S.A. MUSEUM 
rounded fold; the back is faintly excavate in posterior half and there is a pair 
of low, rounded elevations at posterior end of frontal lobe, which is indistinctly 
medianly carinate. Antero-lateral margin shallowly excavate; antero-lateral 
angle and margin posterior to it finely dentate. Pseudorostral lobes, as seen from 
above and also in lateral view, subacute in front, meeting for a distance equal to 
distinctly more than one-fourth of length of carapace. Frontal lobe distinctly 
marked off; ocular lobe rounded, rather small, wider than long, without apparent 
lenses and armed with a pair of slender denticles. 
First and second pedigerous somites short, third and fourth equal in length 
dorsally, fifth longer; pleural parts of second expanded forwards, of third 
forwards and backwards, bringing the second and third peraeopods fairly wide 
apart; fourth somite fused with third, bent backwards on sides, there being a 
greater space between coxae of third and fourth legs than between fourth and fifth. 
Pleon longer than cephalothorax; sixth somite relatively long, not shorter 
than fifth, dilated near posterior end, where it is about as broad as long; ‘telson 
a little longer than sixth somite, cylindrical, with, triangular apex armed with a 
pair of rudimentary spines. 
First antenna. with first joint of peduncle subequal in length to second and 
third together; second two-thirds as long as third; flagella two-jointed, the 
accessory flagellum as long as first joint of main lash (fig. 58, ant.) 
Third maxilliped stout, with a strong tooth at distal end of ischium. 
First peraeopod very long, the merus reaching level of apex of pseudorostrum ; 
the short basis is only one-fifth of total length of limb and is armed with a few 
teeth, particularly at distal end; ischium and merus with distal teeth; carpus and 
propodus subequal in length, each longer than basis, and nearly half as long again 
as the dactylus, which bears a dense radial brush of setae. 
Second peraeopod reaching forward to level of apex of pseudorostrum ; basis 
very short, one-third as long as remaining joints together and much shorter than 
carpus; ischium obsolete; carpus twice as long as merus and longer than propodus 
and dactylus together; dactylus about one-third as long again as propodus and 
with one of the terminal setae robust, almost spine-like, and much longer than 
dactylus. 
Third to fifth peraeopods successively decreasing in length; merus not much 
longer than carpus and propodus together; carpus with one stout distal seta 
which does not reach much beyond distal end of propodus, the seta of which is 
also unusually short. 
Uropods slender; peduncle a little longer than telson and nearly twice ag 
long as endopod, which is distinctly shorter than the exopod and consists of three 
joints, successively decreasing a little in length, and each with an inner seta at 
distal end; terminal spines a. little shorter than their respective rami. 
Colour dingy yellow. Length 2:6 mm. 
Adult male. Integument transparent, but calcified and brittle. Carapace 
with coarse, somewhat reticulate, shallow pitting and with the lateral hollow 
margined above and below by a large fold; the lower fold projects as a prominent 
ledge, the carapace seen from above being thereby much broadened, and is consi- 
derably wider than deep; it is two-thirds as long again as depth, fully one-third 
of total length of animal and is more than twice as long as the pedigerous somites 
together ; dorsum shallowly excavate. The summit of the lower lateral fold of 
carapace is elevated to form a narrow ridge, particularly distinct anteriorly, where 
it curves into the wide and shallow antennal notch, obliterating antennal angle, 
behind which the inferior margin is almost smooth. Pseudorostrum bent down- 
wards (thus foreshortened in dorsal view of cephalothorax in fig. 57) with anterior 
