4 Annals of the South African Museum. 



horizon furnished by species of Trigonics is regarded by Lycett -■' as 

 pointing to a Cretaceous age. 



In 1882, as the result of an examination of a collection of shells, 

 Holub and Neumayr f classed the Uitenhage series as Neocomian, 

 thus agreeing with Lycett rather than with the earlier authors. 

 Professor Eupert Jones,. | in an article on the Geology of South 

 Africa, published in Nature, adopts Tate's opinion as to the Jurassic 

 age of the plant-beds. The verdict of Holub and Neumayr is 

 accepted by de Lapparent,§ who classes the Uitenhage series with a 

 portion of the Potomac formation of the Eastern United States as 

 Neocomian. In Oldham's edition of the ' Geology of India,' || by 

 Medlicott and Blanford, the flora of the Uitenhage series is 

 described as " distinctly related to that of the Eajmahal Group, 

 though the resemblances are not sufficient to establish a contem- 

 poraneity of origin." Messrs. Eogers and Schwarz, after discussing 

 the statements of previous writers, conclude that " the only course 

 at present open to us is to regard the age of the Uitenhage series as 

 Upper Jurassic." "I 



The evidence afforded by the collection of plants described in the 

 following pages — a collection rich in specimens but comparatively 

 poor in species — points to a Wealden rather than to a Jurassic age : 

 but this question is dealt with at greater length in the sequel. 



II.— DESCEIPTION OF SPECIMENS. 



Geoup filicales. 



Family POLYPODIACE^. 



Genus ONYCHIOPSIS Yokoyama. 



This genus was instituted by Yokoyama,** a Japanese author, for 

 a species originally described by Geyler if from the valley of Tetori- 

 gawa in the Province of Kaga, Japan, as Thyrsoperis elongata. 



* Lycett (79), p. 229. 



t Holub and Neumayr (82). See also Neumayr (87), ii., p. 330. 



J Jones (84), p. 554. § de Lapparent (00), p. 1267. 



II Medlicott and Blanford (93), p. 205. 



IT Rogers and Schwarz (01), p. 17. 



** Yokoyama (89), p. 26. ft Geyler (77), p. 224. 



