
HaLE—AUSTRALIAN CUMACEA 417 
Pleon as long as cephalothorax, the anterior somites, like pedigerons, with 
obsolete granulation ; subeylindrical excepting for sixth somite which is broadened 
posteriorly; fifth somite about half as long again as sixth, which is as wide as 
long; telson almost as long as sixth somite, tapering, without any abrupt con- 
striction, only in distal third of length; postero-lateral margitis serrate; there 
is a very short post-anal portion, with two terminal spines, rather stout, and 
flanked on each side by a smaller spine, anterior to which are one or two pairs 
of bristles, 
First anteria with the first joint of peduncle about as long as second and 
third together, and third little longer than second (third much longer than second 
in tumida) ; flagellum two-jointed, only half as long as third peduneular segment, 
and accessory flagellum minute. Upper lip unusually elongate. 

Fig. 48. Gynodiasiylis coneava, type female; lateral yiew and cephalothorax from above 
(% 35) 
First peraeopod slender and rather long, the carpus reaching to level of apex 
of pseudorostrum ; basis less than two-thirds us long as remaining joints together, 
and with a small tooth at inner distal angle and some serrations on sides; propodns 
elongate, not dilated, fully one-third as long again as dactylus, and not much 
shorter than propodus, which is almost half as long again as the combined lengths 
of ischium and merus; propodus with three unequal setae at distal end of inner 
margin, one of them louger than propodus; dactylus with several long terminal 
setae, 
Basis of second peraeopod half as long again as rest of limb (which is abbre- 
viated) and with two teeth at outer distal angle; ischium suppressed, mertis serrate 
on inner edge, subequal in length to either carpus or propodus; the last-named 
is two-thirds as long as the dactylus, which has very slender setae, one of the 
terminal ones being longer than the joint, 
Third and fourth peraeopods with basis shorter ‘than rest: of limb, and with 
merus about one-third as long again as carpus and propodus together; one of 
the two distal carpal setae is shorter and much stouter than the others and (unlike 
the latter and the propodal seta) does not reach to level of tip of dactylus; fifth 
peraeopod a little shorter than the others. 
Pedunele of uropod stout, a little longer than the telson and than the tami, 
with a short inner spine at distal end and anterior ta it a short seta; endopod 
