
388 RECORDS OF THE S.A. MUSEUM 
in front and much produced to the rear, the second and third peraeopods being 
very considerably separated. 
Pleon depressed, about one-third as long again as carapace ; fifth somite barely 
longer than sixth, which is a little longer than broad; telson subcordate as seen 
from above, two-thirds as long as sixth somite; a short distal portion is post- 
anal with a pair of apical spines and near them on each side a lateral spine of 
about the same size; lateral serrations small. 

Fig. 21. Gynodiastylis ambigua, ovigerous females; lateral views, and (ceph.) cephalo- 
thorax from above, of type A— and variety —B (xX 30). 
First antenna with first joint of peduncle longer than second and third 
together; flagellum two-jointed and accessory lash small. 
Basis of third maxilliped three-fourths as long again as rest of limb; remain- 
ing joints not differing markedly in length. 
First peraeopod short, barely reaching past apex of pseudorostrum when 
extended, the carpus reaching a little beyond level of antennal angle; basis three- 
fourths as long again as rest of limb, with a slender tooth at inner apical angle; 
propodus about three-fourths as long as carpus, a little longer than dactylus and 
about as long as merus; propodal setae sparse and not very long. 
