Crustacean Fauna of South Africa. 129 



fore remains a no-men nudtnn. 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 glubuhis Walker (1909, Tr. Linn. Soc. 

 Lond. 2nd ser., zool., vol. 12, pt. 4, p. 329, pi. 42A) from the Indian 

 Ocean, which measures 12 mm. and has the head completely hidden 

 under the very tumid 1st peraeon segment and the large 1st side-plate; 

 or it may possibly be the following species. 



STEGOCEPHALOIDES AUSTRALIS 11. sp. 

 (Plate XXVIII. Fig. 29.) 



Head nearly hidden under the tumid 1st peraeoii 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 a.nd inferior margins differentiated by a slight angle, 

 postero-inferior angle rounded (cf. Sars' figure of 6'. christianiensis 

 Boeck, I.e. pi. 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 pleou segment 

 rounded. 



Telsou ovate, tapering, nearly half as long again as basal width, 

 cleft to a little bevoud centre. 



/ 



First antenna, 1st joint equals 2nd and 3rd combined, flagellum 

 with 1st joint equal to 1st peduncular joint or to 2nd and 3rd 

 flagellum joints combined, 8-joiiited, accessory flagellum half length 

 of 1st liagellal joint, 1 jointed with 2 apical unequal setae. 



Second antenna slender and a little shorter than 1st 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. 



