
HALE—AUSTRALIAN CUMAGEA 399 
Peduncle of uropod. dilated distally, jaggedly serrate on both margins, but 
without articulated spines; it. is a little longer than the telson and than the sub 
equal ramt; endopod divided into two jomts of equal length, the first with three 
inner spines and some spinules, the second with two spines on inner margin, and 
a terminal spine less than two-thirds the length of the ramus; exopod with a 
few serrations on outer edge near proximal end and with the longer of the two 
very unequal terminal spines barely longer than that of endapod. 
Colour: carapace and pedigerous somites pale russet brown; pleon and 
appendages cream. Length 3 mm. 
Loc. Tasmania: Marion Bay, 10-17 fath., amongst kelp (W. 8, Fairbridge, 
Euphausiid bottom net, Dec., 1944). Type in South Australian Museum, Reg. 
No. ©. 2744, 
Resembles guadricristata in some respects, but is readily distinguished by 
the sculpture, 
GYNODIASTYLIS MUTABILIS sp. NOV. 
Female with brood young, Carapace deep and somewhat compressed, one- 
third of total length of animal, and less than half as long agam as pedigerous 
somites together; it is only about half as long again as deep, but two-thirds ps 
long again as gréatest width; seen from the side the dorsal margin inclines slightly 
upwards from rear end to above posterior end of frontal lobe, thence descends 
steeply and obliquely to apex of psendorostrum ; each side of frontal lobe with a 
depression partly eniclosed by a low serrate ridge; each pseudorostral lobe has 8 — 
dorsal carina running from apex to frontal lobe and then continued for a short 
distance on the latter; on each side a fine dorso-lateral ridge (with some posterior 
denticles) curves up from front of psendorostram towards the frontal ridge, and 
a longér transverse carina curves back from antennal angle and then forward 
to meet the ridge of frontal lobe; im addition to these carinae, which are all very 
fine, there are a number of short irregular ill-defined longitudinal ridges and 
some shallow pits on the sides; the median part of the dorsum, from frontal lobe 
to hinder margin, is depressed, the rather wide sulcus margined by a low longi- 
tudinal fold on each side. AnteroJateral margin scarcely excavate; antero-lateral 
angle obtuse but with a tooth, behind which inferior margin is serrate for a short 
distance. Psendorostrum subtruncate and excavate in front, the lobes meeting 
for a distance equal to about one-seventh of length of carapace. Ocular lobe 
excessively short, the front margin almost transverse; it is armed with a pair of 
tiny denticles and is rounded at the lateral corners ; no apparent lenses. 
- First, and particularly third, pedigerous somites dorsally much shorter than 
any of the others; the third is expanded fore and aft on the sides, and the second 
and third ‘peraeopods are widely separated; evidently but for the distended 
brood pouch the anterior pleural lobe of second would overlap the first somite 
and that of third the posterior part of sides of second; fourth and fifth each with 
& vlear cut dorso-lateral, lougiiudinal carina on each side. 
Pleon not, quite as long as cephalothorax, the distal somites subeylindrieal 
and rather slender; fifth somite less than one-fourth longer than sixth, which is 
barely dilated posteriorly where it is not as wide as long; telson equal mm length 
to sixth somite, with nearly one-fifth of length post-anal; sides subparallel almost 
to level of end of anal valves and with three small lateral teeth, the last pair more 
prominent than the others; the part distal to the last dentations tapers abruptly 
to the acute apex, atid bears a pair of subapical spines. 
First antenna very stout; first segment of peduncle much longer than whole 
of rest of appendage and, like the short and wide second joint, armed with strong 
