FISHES. MCCULLOCH. 167 



row of fangs which become smaller backwards. There 

 are no fangs or enlarged teeth in Polymetme. 



Photichthys corythccohis Alcock also belongs to this 

 genus, and likewise the recently described Yarrella 

 africana Gilchrist and Bonde (Kept. Fish, and Marine 

 Biol. Survey S. Africa iii, 4, 1922 (1924), p. 8, pi. i, fig. 2). 



I am indebted to Mr. G. Archey of the Canterbury 

 Museum, Christchurch, New Zealand, for the loan of 

 a specimen of Photichthys argenteiis for comparison 

 witli my new species. 



POLYMETME ILLUSTRIS sp. nov. 

 (Plate xlv, fig. 1.) 



Br. 13; D.ll; A.29; P.ll; V.7; C.18. Apparently 

 about 42 scales between the shoulder and the base of the 

 caudal. 



Depth (24 mm.) 5-5 in the length to the hypural 

 joint (133); head (31) 4-2 in the same. Eye (7-25) a 

 trifle longer than the snout (7), 4-2 in the head. Inter- 

 orbital space (6) 1-2 in the eye. Third dorsal ray (20) 

 1-5, fourth anal ray (17) 1-8, pectoral (22) 1-4 in the 

 head. 



Head and body compressed ; the dorsal and ventral 

 profiles almost evenly arched. The profile rises in a 

 gradual curve to the nape from the conical snout; inter- 

 orbital space almost flat, with bony crests above each eye 

 Avhich converge on the snout. Nostrils close together, 

 near upper surface of snout; posterior larger than the 

 anterior. Eye close to the upper profile and situated 

 within the anterior half of the head. Mouth oblique; 

 upper jaw formed by the prernaxillary anteriorly, but 

 by the maxillary posteriorly, which reaches backward 

 to the base of the preoperculum ; it is a little expanded 

 posteriorly, and is traversed by a raised ridge along its 

 length. The cheek is covered by some large and very 

 thin scales, and one extends over a large portion of the 

 maxillary. The premaxillary and maxillary with curved 

 teeth ; these appear to be arranged in two rows on the 

 premaxillaries ; the outer being the larger. Maxillary 

 teeth in a single row, larger than those on the pre- 

 maxillary and with smaller ones set between them. 

 Mandible projecting beyond the upper jaw, with two 



