

408 RECORDS OF THE S.A. MUSEUM 
depression is bounded by the kidney-shaped branchial swellings which, viewed 
from above, are elevated above the median portion of the dorsum, which is convex, 
with a pair of pits near the swollen posterior edge. Antero-lateral margin rather 
deeply concave; antennal angle acute and margin posterior to it finely serrate. 
Pseudorostrum narrowly truncate in front, and very oblique as seen from the 

Fig. 36. Gynodiastylis strwmosa, type female; ant., first antenna with upper lip, and seeond 
antenna (X 110); prp., second and third peraeopods (xX 58; distal joints, X 110); urop., 
uropod with fifth and sixth pleon somites, and telson ( X 58); tels., distal end of telson (X 110). 
side; lobes meeting for a distance equal to one-fifth of length of carapace. Frontal 
lobe well defined ; ocular lobe rounded, twice as wide as long and with indistinct 
corneal areas. 
First to third pedigerous somites successively increasing a little in length 
dorsally ; pleural parts of second produced forwards across first somite, those of 
third moderately expanded anteriorly, and markedly so to the rear ; fourth somite 
abruptly longer on the back, completely ankylosed with third, and with a dorso- 
lateral very swollen carina on each side. 
Pleon cylindrical, not depressed; longer than cephalothorax; fifth somite 
one-third as long again as sixth, which is slightly dilated posteriorly, where it 
is as broad as long; telson cordate, plump, with lateral edges finely serrate; there 
is a very short post-anal part, armed with a pair of short stout terminal spines, 
flanked on each side by a similar spine. 
First antenna relatively large and robust; first joint of peduncle with width 
equal to two-thirds its length, which is equal to that of the other two; second 
