92 Annals of the South African Museum. 



and with 2 smaller spines on the side, one below the. dorsal fin and 

 the other below the spine on the dorsal ridge ; interorbital space very 

 concave ; profile of snout high and slightly concave ; 10 teeth on 

 upper jaw, 8 on lower; eye nearly | length of snout and 3 times in 

 distance between point of snout and gill-opening. Ten scutes between 

 gill-opening and tail, 6 transversely, 10 across ventral surface. 

 Depth of body slightly less than its greatest width. 



Dorsal 9 ; situated wholly in advance of anal, highest anteriorly, 

 5f times in length of body. Pectorals ^ length of head. Anal 9 ; 

 similar to dorsal but slightly lower. Caudal truncate, slightly longer 

 than head and T 3 length of body. Surface of scutes granulated but 

 without prickles or spines. 



Colour (of preserved specimen), dark bluish above, reddish yellow 

 on belly. 



One specimen, 84 mm. in length, from Natal ; Dr. Gilchrist. 



OSTBACION CONCATENATUS, Bl. 



Ausl. Fisch, pi. 131, 1785. 



Carapace 3-ridged, forming a broad continuous bridge across the 

 back of the tail. Dorsal ridge with 2 compressed spines placed 

 close together ; each ventral ridge with 4 compressed spines, 2 of 

 which are near each other and in the vertical of the dorsal spines, 

 the others being one at each extremity of the ventral ridge ; supra- 

 orbital edge with 2 sharp spines pointing backwards and outwards, 

 (All these spines become less prominent with age, and only traces of 

 them can be discovered in adult examples (8-10 inches), Giinther.) 

 Interorbital space feebly concave ; profile of snout high and concave ; 

 eye f length of snout and 2J times in distance between point of snout 

 and gill-opening ; 8 scutes from gill-opening to tail, 8 transversely, 

 10 across ventral surface. Depth of body about equals its width. 



Dorsal 9, situated in advance of anal ; highest anteriorly, 4^ times 

 in total length excluding caudal. Pectorals more than % length 

 of head. Anal 10, similar to dorsal and situated immediately 

 behind anus. Caudal truncated, J length of body. Surface of scutes 

 striated, but without prickles or spines. 



Colour (of preserved specimen), uniform whitish. 



One specimen (immature), 17 mm. in length, procured by the 

 Cape Government trawler P. Faure (s.) in 20 fms., off Natal 

 coast; False Bluff, N.E., 4f miles. 



