Crustacean Fauna of South Africa. 129 
fore remains a nomen nudum. The species is said to be widely dis- 
tributed in the South Atlantic and Indian Oceans, from 0-—2000 
fathoms ; it is dark brown in colour, and measures 10 mm. It may 
be the same as Stegocephalus glubulus Walker (1909, Tr. Linn. Soc. 
Lond. 2nd ser., zool., vol. 12, pt. 4, p. 329, pl. 424A) from the Indian 
Ocean, which measures 12 mm. and has the head completely hidden 
under the very tumid Ist peraeon segment and the large Ist side-plate; 
or it may possibly be the following species. 
STEGOCEPHALOIDES AUSTRALIS Nl. Sp. 
(Plate XXVIII. Fig. 29.) 
Head nearly hidden under the tumid Ist peraeon segment, which is 
equal to the 2nd and 3rd together. Eyes wanting. Antero-lateral 
angles not prominent. Side-plate 1 triangular, as deep as its segment 
and deeper than long, its basal margin longer than either of the others, 
postero-inferior angle acute, 4 deeper than its segment and deeper than 
long, posterior and inferior margins differentiated by a slight angle, 
postero-inferior angle rounded (ef. Sars’ figure of S. christianiensis 
Boeck, l.c. pl. 70, fig. 2), postero-inferior angle of 5 subacute, 6 
slightly larger, not smaller, than 7, subquadrate, a little deeper than 
long, postero-inferior angle rounded, 7 deeper than long, postero- 
inferior angle rounded. Postero-inferior angle of 3rd pleon segment 
rounded. 
Telson ovate, tapering, nearly half as long again as basal width, 
cleft to a little beyond centre. 
First antenna, Ist joint equals 2nd and 3rd combined, flagellum 
with Ist joint equal to Ist peduncular joint or to 2nd and 3rd 
flagellum joints combined, 8-joited, accessory flagellum half length 
of Ist flagellal joint, 1 jointed with 2 apical unequal setae. 
Second antenna slender and a little shorter than Ist antenna, 2nd 
joint shortest, 4th longer than 3rd, flagellum 8-jointed, scarcely longer 
than 4th peduncular joint. 
Upper lip very asymmetrically bilobed. 
Lower lip lobes gradually tapering, with incurved apical triangular 
tooth. 
Mandibles, cutting-edge with 11 teeth in both mandibles, the teeth 
largest anteriorly, secondary cutting-edge in left with ca. 25 smaller 
teeth. 
First maxilla, inner plate with plumose setae all along upper oblique 
margin, outer plate with 8 denticulate spines, palp not reaching apex 
of outer plate, with 4 apical serrulate setae. 
