340 Annals of the South African Museum. 



HELICHTHYS (?) sp. 



A piece of shale from the deposit at Siberia, C. P., shows portion 

 of the body of a small fish including the proximal portions of the 

 anal and pelvic fins. 



The body must have been fairly long and shallow. The pelvic 

 fin is not entire, but the preserved portion consists of 13 rays, 

 spread out into something of a fan-shaped body. They show no 

 evidence of bifurcation. The anal fin is preserved in its proximal 

 half; it is composed of 35 or 36 rays, of which the first seven at 

 least increase rapidly in size from the first. There is no evidence 

 of the presence of fulcra. The dorsal fin is not preserved. 



The flank-scales are small, rhomboidal, without external ornament. 

 There seems to be evidence of a single longitudinal groove on the 

 inner surface. 



It is possible that the form is allied to that described by Broom 

 as Dictyopyge formosa. It is doubtful, however, whether that species 

 can be ranked in the genus Dictyopyge as defined by Egerton. Ex- 

 cept in the pectoral fin no fulcra are seen ; while there is no evi- 

 dence of bifurcation of the fin rays in the specimens of formosa 

 which we possess. Rather does the form seem to be generically 

 identical with Helichthys, agreeing in the comparative scarcity of 

 fulcral bones, in the simple unbifurcated rays, and in general cha- 

 racters. Fulcra are not well-marked, but are present. 



It is considered, therefore, that the type specimen of Dictyopyge 

 formosa (S. A. Mus. Cat. No. 2761) must Jbe known as Helichthys 

 formosa. 



Type. Incomplete small fish. S. A. Mus. Cat. No. 5130. 



Locality. Siberia, Wodehouse, C. P. 



Horizon. Shale-band near base of Cave Sandstone. 



CLASS REPTILIA. 



SUPER-ORDER ANOMODONTIA, Owen. 



ORDER THERIODONTIA, Owen. 



PACHYGENELUS MONUS, Watson. 



1913. Watson. Geol. Mag. N. S. Dec. V. Vol. X., p. 145, figs 1, 2. 



This form is known only from the anterior portion of a small 

 dentary. There are only two incisors, of which the first is much 

 bigger than the second. The canine is large, of oval section. There 

 is a long diastema between the canine and the first molar. "The 



