146 Annals of the South African Museum. 
The very short telson serves to distinguish this species from all the 
others, not only in the genus but also in the family. 
Gen. PELTOCOXA Catta. 
1875. Peltocoxa Catta, Rev. Sci. Nat. vol. 4, p. 161. 
1893. 3 (part) Della Valle, F. u. Fl. Neapel. vol. 20, p. 647. 
1906. a Stebbing, Das Tierreich, 21, pp. 159, 723. 
PELTOCOXA AUSTRALIS N. Sp. 
(Plate XXVI. Fig. 13.) 
Body smooth, firm and rather strongly indurated. Rostrum very 
small. Antero-lateral angles of head rounded. Eyes round oval. 
Side-plates 1 and 2 very small, concealed by 3,3 and 4 very large, 
adjacent margins closely fitting, inferior margin of 5 concave, 6 and 
7 small, ovoid, not hidden. First and second peraeon segments short, 
together equal to 3rd, 2nd a trifle shorter than Ist. 
Pleon smooth, 4th segment longest, with a rather high dorsal crest 
extending whole length of segment and rounded at fore and hind ends, 
postero-inferior angles of segments 1-3 rounded. 
Telson boat-shaped, short, reaching only as far as apex of peduncle 
of 3rd uropod. 
First antenna short, very stout, Ist a little longer than broad, equal 
to 2nd and 8rd together, 2nd and 38rd broader than long, flagellum as 
long as 2nd joint, 4-jointed, 1st joint very stout, with long sensory 
filaments, 2nd-4th minute, with fine setules, accessory flagellum not 
recognised with certainty. 
Second antenna a little longer than Ist, ultimate joint a little 
shorter than penultimate, flagellum shorter than peduncle, 4-jointed, 
tapering, 4th joint ending in a long fine seta. 
Upper lip subtriangular with a large apical notch. 
Lower lip, lobes tapering to subacute apex, inner margin not 
notched. 
Mandibles, cutting-edge and secondary cutting-edge finely denticu- 
late, molar very large and well developed, palp apparently absent. 
First maxilla, inner plate with 1 setule in an apical indent, outer 
plate with 10 (?) spines, palp 2-jointed, the joints subequal, apex with 
4 setae. 
Second maxilla, both plates narrow and subequal, apex with 8 spine- 
setae. 
Maxilliped, inner plate reaching to end of Ist joint of palp, apex 
