4 Annals of the South African Museum. 



The anal fin is about the same size as the dorsal, and begins 

 opposite the point of union of the latter and middle thirds of the 

 dorsal. It has about 36 jointed but unbranched rays. The fulcra 

 are rudimentary. 



The caudal fin is very imperfectly preserved. 



There is, as in A. scutata, a row of ridge scales both in front 

 of and behind the dorsal fin. Those between the dorsal and tail 

 are very large and only feebly ornamented. Those in front of the 

 dorsal are smaller, thinner, and more distinctly striated. The body 

 scales are obliquely striated and posteriorily feebly but distinctly 

 denticulated. 



FAMILY PLATYSOMATIDAE. 



CAKUICHTHYS ORNATUS, g. et sp. n. 



The type of this species is a single specimen found at Doom 

 Eiver, in the Cradock district, and most probably from beds of the 

 Lystrosaurus zone. 



A small portion of the front of the head is missing, and the whole 

 of the tail from behind the dorsal fin. 



The trunk is deeper than in Eurynotus, but not so deep as in 

 Platysotnus. The head is large and deep, somewhat resembling 

 the head of Platysomus, but with relatively much more power- 

 ful jaws and with the branchiostegal rays large and extending 

 much below the mandibles. The teeth are small and styliform. 

 The dorsal margin curves up and back above the head and then 

 passes nearly directly backwards to the dorsal fin. Along this 

 dorsal margin are a series of enlarged much ornamented scales. 

 At the commencement of the dorsal fin the line of the body 

 margin abruptly passes downwards and backwards as in 

 Platysomus. 



The pectoral fin is large and possibly not unlike that in Eury- 

 notus. It is too imperfectly preserved to show its structure. Only 

 the anterior part of the dorsal fin is preserved. There are a 

 series of 9 or 10 short but gradually lengthening rays in front of 

 what is probably the longest ray of the fin. These short rays are 

 jointed but unbranched. In front of the first long ray are feeble 

 fulcra. The later rays of the fin are long and much feebler than 

 the anterior. They are jointed and unbranched. The pelvic fin 

 is much larger than that in Eurynotus. It has about 40 rays all 

 jointed and unbranched. The posterior part of the fin is distinctly 



