
114 RECORDS OF THE S.A. MUSEUM 
Mucrones are present on the apex of the exopod of the uropod of aspera; they are found 
in the juvenile of tribulis and bovis but not in the adult. 
Hight Australian species, including similis, which is recorded from Queensland by Foxon, 
and excluding exsculpta, which was taken off the northern tip of Queensland, actually in the 
Austro-Malayan sub-region. 
CycLASPIs TRIBULIS Hale. 
Cyclaspis tribulis Hale, 1928, p. 34, fig. 3-4. 
Specimens from a number of localities and ranging in size from 2-7 mm. 
(juveniles with last pair of peraeopods undeveloped) to 13 mm. to 15 mm. (ovigerous 
females and adult males), enable one to discuss the great variation exhibited by 
the species. 
All examples possess the median dorsal elevation, p.o.t. in accompanying 
figures, at the base of the ocular lobe, and anterior to the first transverse carina, 
referred to in the original description of the species; even in juveniles 2-7 mm. in 
length it is represented by a very slight prominence (fig. 86, G). In the sub- 
adult it may be tooth-like (fig. 36, F, of an example 10 mm, in length) rounded- 
conical, or in the form of a compound tubercle. 
Ovigerous females (from Tasmania and New South Wales) show a remark- 
able development of the sculpture previously described for the 12 mm. subadult 
e.f. Hale, 1928, fig. 3, a and b with fig. 36 A-C herewith). The surface of the 
carapace is coarsely reticulate posteriorly, more or less strongly tuberculate or 
studded with blunt spines anteriorly, The dorsal elevation at the base of the 
eye-lobe is a transversely elongate, flat-topped tubercle and is connected by a very 
short longitudinal carina to the first transverse ridge. The pseudorostral suture 
is fused. The median dorsal ridge is wide and flattened, with irregular edges: 
the dorsal margin of the carapace and the dorso-lateral carina may be more or 
less spinose. The prominences on the transverse ridges are very large; the 
posterior pair are concave and spoon-like in front. The median tubercle at the 
hinder end of the carapace is large and conical in old specimens. The first pedi- 
gerous somite is exposed, but is short. 
In the first peraeopods (imperfect in the types) the basis is a little longer 
than the remainder of the limb, and has serrated edges; the ischium is two-thirds 
as long as the merus, which is expanded distally; the carpus is twice as long as 
the merus, a little longer than the dactylus and three-fourths as long as the pro- 
podus: the anterior segments sometimes bear sparse black spots. 
As in the types the rami of the uropods are subequal in length to the ped- 
uncle the exopod slightly longer than the endopod and with the apex dilated; the 
inner margin of the endopod is spinulose for half its length and that of the 
exopod bears strong plumose setae. 
Length 13 mm. to 14 mm. 
Submature males and females, 7 mm. to 10 mm. in length, may have more 
or less strongly developed teeth on the dorsum and on the dorso-lateral ridges; 
in these individuals the propodus of the first legs is longer than the carpus and 
the peduncle of the uropoda is as long, or almost as long, as the rami. 
Juvenile examples, 2-7 mm. or so in length (and taken with a 40 mesh trawl 
in New South Wales), have the primary reticulation of the carapace relatively 
coarse and the elevations far less prominent, the propodus of the first peraeopods 
not or scarcely longer than the carpus and the peduncle of the uropods relatively 
short, only about half the length of the rami; both rami of the uropoda bear 
terminal mucrones (fig. 36, H*). 
Adult males (from Tasmania) are so markedly dissimilar from the sub- 
adult of this sex (c.f. Hale, 1928, fig. 3, b, and fig. 37, A-B herewith) that one 
is inclined to give them specific rank. Comparison, however, shows that the strue- 
