5G Annals of the South African Museum. 



% distance of mouth from end of snout ; anterior nasal valve con- 

 tinued towards median line by a fold that nearly meets that of the 

 other side ; cleft of mouth straight, longer than nostril ; rostral 

 ridges more distant from each other behind than in front and 

 separated by a shallow groove. 



Dorsal fins about the same height and pointed ; their distance 

 apart equals 1 times interspace between 2nd dorsal and root of 

 caudal. 



Back finely granular, with a row of compressed spines along the 

 middle of the back, 1 on each shoulder, and a row round upper 

 margin of eyes. 



Colour (of preserved specimen), pale, slightly mottled brown above, 

 nearly white on lower side ; scattered small round whitish spots on 

 back. 



One specimen, 640 mm. in length, from Mr. Eomer Eobinson, 

 Natal. 



FAMILY TBYGONID2E. 



GEN. PTEEOPLATEA, Mull, and Henl. 



PTEROPLATEA NATALENSIS, n. sp. 



Disk nearly twice as broad as long. Tail a little more than i as 

 ong as disk, with a minute rudimentary fin at extremity and a 

 slight upper and lower ridge semi-annulated with black. A short 

 tentacle behind spiracle. Lower dental laminae concave in the 

 centre, the points of the curve being received into corresponding 

 depressions in the convex curve of the upper laminae. 



Teeth small, unicuspid. Spine not serrated. Interorbital space 

 convex with a V-shaped depression and 2 or 3 small knobs or blunt 

 spines. Two large tuberculous lumps behind spiracles. 



Colour (of preserved specimen), light brown mottled with darker; 

 upper surface of tail with brown patches. 



One specimen, 157 mm. in length excluding caudal, from Mr. 

 Eomer Eobinson, Natal. 



GEN. ^ETOBATIS, Mull, and Henl. 



AETOBATIS NABINARI, Euphrasen. 



Teeth, lower dental laminae projecting. Disk about twice as broad 

 as long, distance from mouth to anus nearly f width of disk. Head 



