New Crustacea from the Swan River Estuary. 
43 
Female. 
Ovigerous, length 2-55 mm. Body small, the urosome segments 
coalesced, rostrum small and pointed. Eye-lobes rounded and elongate. Eyes 
black and well developed. 
Appendages: First antenna, about one third of the body length; first 
segment longer than second and third together (in figure appears slightly 
shorter, owing to bending of appendage). Lower edge of segment one with 
four straight spines of which the proximal is the smallest, and a little 
off the ventral line. There is a slight lateral bulge proximally on the first 
segment which bears three spines. A few long tufts of setae also occur on 
the segment. Segment 2 bears several tufts of setae and is cylindrical in 
section. Flagellum is seven segmented. Second antenna somewhat larger 
than antenna 1. There is a pair of spines ventrally on segment 3. Seg- 
ment 4 has five well developed spines on the lower edge, a proximal pair a 
quarter of the distance from the proximal end, a median pair at half the 
distance and the fifth about an eighth of the distance from the distal end. A 
number of long setae also occur on this segment. Segment 5 has one median 
ventral spine and many long setae. Flagellum is 3-segmented. (The figure 
shows an abnormal appendage with a paired distal spine on the 4th seg- 
ment.) Mandible with basal segment not extending beyond the base of 
the end segment; palp small, of two segments, each with a strong ciliated 
seta. Maxillae, typical. Maxi'lipeds sub-lamellar with basal lobes narrowly 
produced. The masticatory lobes are long, the inner edge fringed with 
slender spines; palp elongate, the last segment short but broad. 
Gnathopod 1 with palm almost square with a row of four short stout 
spines, supplemented by short setae on the edge of the propod; dactyl with 
a slight accessory tooth. Gnathopod 2 larger than Gnathopod 1; not differ- 
entiated from other members of the genus. The fourth segment is closely 
attached to the bind margin of the fifth, and fringed with two rows of 
plumose setae. Propod sub linear, without a palm; dactyl with 4 accessory 
teeth. Pereiopods normal, the anterior two with basal segment large and 
broad and the merus greatly expanded, the carpus short and the! dactyl 
considerably larger than the propod. Pereiopods 3 and 4 are comparatively 
stout and have two rows of spines on the outer side of the carpus. Pereiopod 
5 is slender and elongate, the basal joint lamellarly expanded and fringed 
on both edges with long ciliate setae which however are not so dense as 
in other members of the group. 
Branchial lamellae well-developed; none on gnathopod 2. Incubatory 
lamellae elongate and oval, edged with strong setae. 
Pleopods with basal portion greatly expanded; rami narrow and densely 
setose. 
Urosome, segments fused, sides hollowed out to receive insertions of 
uropods 1 and 2. Rami short, with stout spines on the margin externally 
on the first, but those of fhe second spineless except apieally. Uropod 3 
with peduncle short, ramus single and lameTar with a few long apical setae. 
