62 Annals of the South African Museum. 



In the case of the specimens from the collection of the South African 

 Museum labelled " Sunday's Eiver," no more detailed account of 

 locality is available, but these are all typical Mollusca of the Marine 

 Beds or Sunday's Eiver Beds. Of all the fossils examined, the only 

 forms which indicate fresh-water conditions are the Unio from the 

 Wood Beds of the Bezuidenhouts Eiver, below Blue Cliff station, and 

 a single specimen of Limncea from the section at Buck Kraal, Sunday's 

 Eiver. Whatever may be the exact relation of the fossiliferous beds 

 exposed below Dunbrodie (occurring below a band containing plant 

 impressions) to the main part of the " Wood Bed " series, the fauna 

 from Dunbrodie is essentially a marine one : as already stated in the 

 second section of this paper, there is no reason on palaeontological 

 grounds to suppose that this small marine assemblage, characterised 

 by the prevalence of Gasteropoda, is materially older than the fauna 

 yielded by the Trw/oma-bearing Marine Beds. 



The collection obtained by Mr. Eogers from the Marine Beds of 

 the Coega Eiver and Sunday's Eiver valleys, in 1905, includes some 

 interesting additions to the fauna. For full information concerning 

 the occurrence of these and commoner associated forms, the recent 

 report by Mr. Eogers should be consulted.* This work adds 

 materially to our knowledge of the Sunday's Eiver Beds, particularly 

 with regard to the vertical distribution of many of the Mollusca in 

 the extensive sections examined ; but the results in no way strengthen 

 the hope that a scheme of zonal subdivision of the Marine Beds may 

 soon be within reach of attainment. On the contrary, the evidence 

 obtained by Mr. Eogers, as already mentioned, seems to emphasise 

 the striking similarity in the aspect of the fauna throughout the 

 whole thickness of beds exposed. 



The few specimens found by Mr. Eogers in a patch of marine 

 Uitenhage beds at Knysna Estuary f only represent the product of 

 a hasty search, and it is believed that careful collecting at this new 

 locality may yield good results. 



CLASS ANTHOZOA. 



GENUS THAMNASTR^EA J Lesauvage. 



THAMNASTE^A sp. 



There are several specimens of a Thamnastrc&a from the locality 

 between milestones 24^ and 24f on the railway between Uitenhage 



* Rogers (2), pp. 22-33. f Schwarz (2), pp. 50, 74. 



J For remarks on the correct application of this generic name see Gregory (2), 

 p. 131. 



