264 Annals of the South African Museum. 



somewhat differently from Schellwien, but my material is too 

 unsatisfactory to decide the matter. 



The lower jaw has an elongated triangular dentary and a powerful 

 angular. 



The palato-pterygo-quadrate arch is fully ossified, but the exact 

 limits of the different element cannot be made out with certainty. 

 There is a long narrow bone below the quadrate stretching from the 

 articular region to the lower end of the hyomandibular. This would 

 seem to be the symplectic. The hyomandibular is a powerful bone 

 and fairly similar to that of the ordinary Teleosteans. In addition 

 to supporting the opercular bones and the quadrate arch, it supports 

 the hyoid arch. There is a large quadrangular epihyal and an 

 elongated triangular ceratohyal. The interhyal has probably been 

 cartilaginous, as has also probably been the hypohyal and the 

 urohyal. Under the subopercular are six branchiostegals. 



The clavicular arch consists of the clavicle, supraclavicle, post- 

 clavicle and post-temporal, but there seems to be no trace of an 

 infraclavicle. A mucous canal crosses the supraclavicle obliquely 

 as in the Palseoniscids. There is a small ossification which possibly 

 may he the coracoid as is thought by Schellwien. 



The pectoral fin consists of 14 rays with 5 or 6 fulcra in front. 

 The rays are much flattened distally, but apparently not branched. 



The pelvic fin consists of 7 rays which are branched distally. 

 The fulcra are powerful. 



The dorsal fin begins exactly in the middle of the back of the fish 

 and consists of 13 rays, of which the last 3 are very small. All 

 the rays are branched distally and articulated. In front are a row of 

 very powerful fulcra, 9 in number. The anal fin consists of 9 rays 

 with 9 powerful fulcra in front. 



The caudal fin consists of 16 rays, all of which are branched and 

 articulated. Below and in front of the first ray are 14 fulcra, and 

 14 fulcra also lie above the tail, gradually passing into dorsal 

 scales in front. The rays of the dorsal, anal, and caudal fins are 

 double. Though the tail is in a sense brevi-heterocercal the upper por- 

 tion is really continued as a long, slender process bearing small rhombic 

 scales about 20 mm. beyond the end of the middle of the tail. 



All the specimens of Semionotus capensis are believed to come from 

 Stormberg beds, and to be thus of lower Jurassic Age. 



CLEITHROLEPIS EXTONI, Smith- Woodward. 



This remarkable deep-bodied Ganoid was described in 1888 by 

 Smith-Woodward from specimens found at Eouxville. Though the 



