
HALE—AUSTRALIAN CUMACEA 113 
in some of the related forms, not. a brush such as occurs in the adult male of 
pura, ete. 
The second peraeopods have a plumose seta on ischium, an outer apical 
spine on merus, two opposite apical spines on carpus and the dactylus is twice 
as long as the propodus. The third to fifth legs have the fossorial setae long, two 
on the carpus, and reaching well beyond apex of dactylus, as in fig. 3, H. 

Fig. 35. Cyclaspis cottoni, adult male; A, antennal notch and first antenna; B, cephalo- 
thorax and first pleon somite from above; C, anterior portion of carapace; D and H, terminal 
joints of first and second peraeopods; F, fourth peraeopod; G, uropod (A, D and E, X 110; 
B, X 25; C, F and G, x 64). 
In the uropoda the peduncle is more than one-third as long again as the 
equal rami and bears a row of plumose setae on inner margin and, above these 
on posterior fourth, a row of shorter setae; the inner margin of the endopod 
has a row of about ten setae proximally, followed by a row of thirteen short 
spines, five short, one longer, six short and one longer; distal portion unarmed 
and apex simply pointed; endopod with a series of long plumose setae; apex 
truncate with a long and a short terminal spine. 
SECTION 2. 
exsculpta group. 
Each side of carapace with two antero-lateral tubercles and at least one postero-lateral 
prominence, the last sometimes massive; these assist in marking out the subquadrangular de- 
pressed area characteristic of the group. Excepting the spinose aspera, this lateral concavity 
is emphasized by more or less distinct enclosing ridges, including two transverse carinae which 
extend across the back in at least the female of all but australis, where only the posterior carina 
is developed on the back. 
In the female the carapace as seen from the side, and from above, is uneven owing to bold 
sculpturing. Marked sexual dimorphism may occur in the fully adult (i.e. tribulis) and the 
lateral concavity of the male be hardly existent, although its outline is marked more or less by 
elevations and by ridges, 
