
168 RECORDS OF THE S.A, MUSEUM 
mam, to just over 2 mm. but the appendages show no differences, They were taken 
in company with males of inflates, which are distinguishable because of the slightly 
different uropods, in which the peduncle is relatively shorter, the distal spine of 
the exopod does not quite reach to middle of length of endopod (exclusive of Ler- 
minal spine) and the distal spine of the endopod is not quite so long, being leas 
than one-third the length of the ramus; further, the dactylus of the first peravopod 
is slightly shorter m relation to the propodus of that limb. 
tenus Senmorrema Calman. 
Schizotrema Calman, 1911, p. 460; Stebbing, 1918, p, 165 (kev), 
SOHIZ0OTREMA AGULEATA Itlale, 
Schizotrema bifrons Lale (mec Calman), 1936, p. 429; fig, 18, 
Schizotrema bifrons var. aculeata Late, lec. cit., p. 4380, fig, 19, 
Kurther Australian specimens are available. As the body armature differs 
always from that deseribed by Calman (1911, p. 362, pl. xxxiv, fig, 18-21) for inis 
bifrens from the Gulf of Siam the name aculeata may be applied to the Anstralian 
form, The delicate spines are easily damaged, but as proviously mentioned they 
do show some variation. Ovigerons females and fully adult males, assumed to 
belong together, exhibit quite considerable differences in this direetion, 
S. bifrons is described from the female only. Females and almosi adult 
wales of aeuleata have the spinulation mnch more marked than in the female of 
hifeons, with at least one paiv of outstanding dorsal spines, and a suuilar large 
lateral spine on each side of the second to fifth peraeon somites and on all the 
pleon somites; the side spines are particularly prominent when the animal is 
viewed From above (see posterior portion of pleon of female and subadult male 
in (ig. 16). The surface dorsally and laterally bears tiny spinules and some 
amall spines. ‘lhe fifth pleon somite is as wide as long and is not longer than 
the telaonie somite; the longest dorgal and lateral spines are equal in length 
to about half the width of the somite. 
Adult male, Wuolly mature males of the same size us ovigerous females 
(approximately 1°7 mim.) and taken by submarine light at Port Lincoln, South 
Australia, are here regarded as belonging to aeweatm because the arrangement 
of the spines of the dorsum is essentially the same, although the spines themselves 
are shorter. There are no very large lateral spines as in the adult, female aud 
young male. 
The earapace is depressed, two-fifths of total length of animal and twive as 
long as the pedigerous somites together; at the rear is a triangular, low timidity 
which is nof produeed backwards and which is margined on each side by a pair 
ol deep grooves, converging from the posterior end to meet in the mid-line be- 
tween the branchial regions, and thence diverging to meet a tumidity behind 
each eye: dorsally and dorso-laterally it is covered with spines, which become 
{ubereular on the lower parts of the sides; one or two spines behind (he eyes are 
larger than the others and there is & conspicuous spine below the psendorostrim. 
directed outwards from the front, Antero-lateral corner angular, not prordneed 
and with asamall spine, behind which is a row of apinnles. 
Kirst peraeon somite exposed ag a narrow strip; second to third about ae 
wide as carapace, with pleural parts expanded and armed with spines larger than 
those of sides; dorsal pair of spines on second and third not larger than pleural 
spines, on fourth louger, and on fifth as long as longest dorsal spines of first 
io fourth pleon somites, 
