210 Annals of the South African Museum. 



section. It should be noted with regard to the first of these points 

 that although Tate made no mention of any trace of umbilical 

 marginal tubercles in his specimen, such traces exist in several of 

 the ribs, which are swollen at that part which corresponds with the 

 row of umbilical nodes in the Knysna specimen. 



While bearing in mind that these forms are so far comparable, it 

 is at the same time not improbable that Tate's Ammonites subanceps 

 should be placed with those species of Hoplites (sensu lato) which 

 Uhligh as united to form the narrower generic group Solgeria.* 

 Great similarity is shown to figures of forms ascribed by Sayn f to 

 Hoplites arnoldi (Pict. and Camp.) and by Toucas to Hoplites botella 

 Kilian.J These have been considered by Pavlow to be wrongly 

 determined, and to represent one species to which he has given the 

 name Hoplites heteroptychus. It was even suggested by Neumayr 

 that Ammonites subanceps might represent the young of Crioceras 

 spinosissimum, and this does not seem excluded as a possibility. 

 While Tate's specimen, which was very imperfectly figured, is cer- 

 tainly to be brought into the closest comparison with Neocomian 

 forms of Hoplites, and not with the Jurassic Reineckia anceps as 

 thought by Tate, only the collection of additional material will show 

 with certainty its true narrow relationships, though I am inclined to 

 think that its nearest allies are to be sought in representatives of 

 Uhlig's genus Solgeria, of which Hoplites heteroptychus Pavlow is an 

 example, rather than in members of the genus Acanthodiscus. 



GENUS BELEMNITES Lamarck. 

 BELEMNITES sp. 



Two specimens of belemnites are unfortunately only of a frag- 

 mentary character. One was collected by Mr. Eogers at Brentford, 

 Knysna Estuary (153h), and the other was obtained by Miss M. 

 Wilman at Coega. 



1. The specimen from Brentford is a fragment of a rostrum, and 

 neither the alveolar nor apical end is preserved. It is compressed 

 in the dorso-ventral direction in such manner as to give a broadly 

 ovate outline in cross-section. The greatest transverse diameter is 

 situated at some distance at least a third of the length of the frag- 

 ment away from the alveolar end of the specimen. From this 



* Uhlig (5), p. 624. 



f Sayn (1), p. 682, pi. xii., fig. 6. 



J Toucas (1), p. 606, pi. xviii., fig. 10. 



Pavlow and Lamplugh (1), p. 467 (109 of authors' copy). 



