60 Annals of the South African Museum. 



ment, were nevertheless peculiarly local in their occurrence, even 

 within a relatively restricted area. The greater, then, is the neces- 

 sity for caution in generalising from scanty data regarding the 

 insufficiently explored littoral Neocomian deposits with which we 

 are dealing. 



V. DESCEIPTIONS, CRITICAL NOTES, AND LISTS OF 



FOSSILS. 



In the records of occurrence accompanying the following 

 descriptions, it will be understood that when no collector's name 

 is mentioned, and no other indications are given, the specimens in 

 question were obtained by Mr. A. W. Eogers and Mr. E. H. L. 

 Schwarz in 1900 or by Mr. Eogers in 1905. The numbers quoted 

 in parentheses refer to numbers printed on labels affixed to the 

 specimens. All the specimens obtained in 1900 by Messrs. Eogers 

 and Schwarz, and some also sent to me from the collection in the 

 South African Museum, are labelled with plain numbers printed on 

 yellow paper. Those collected in 1905 by Mr. Eogers have blue 

 labels bearing a number followed by an alphabetical letter. A few 

 of the specimens from the South African Museum and all those 

 comprising the collection obtained by Miss M. Wilman at Coega 

 are without numbers. 



With the exception of Holcostephanus baini, H. modderensis , and 

 H. wilmancB, all the fossils fully dealt with in these pages are repre- 

 sented in the collections submitted to me by Mr. Eogers ; but it need 

 scarcely be remarked that these only include examples of about two- 

 thirds of the species of invertebrates known to occur in the Uitenhage 

 Series, and it may be added that the published accounts of several 

 types figured or described by Sharpe and Tate call for critical 

 revision at some future time. To deal exhaustively with all the 

 invertebrate forms hitherto recorded from the Uitenhage beds is 

 beyond the scope of this memoir ; and since a single compiled list 

 of the whole fauna, including names taken without criticism from 

 other works, would be open to obvious objection, it will be found 

 that lists of species with localities given at the close of this descrip- 

 tive section, contain names which, except those of the ammonites just 

 mentioned, refer only to specimens entrusted to me by Mr. Eogers. 

 Additional notes of occurrences, however, frequently accompany the 

 following descriptions and comparisons, and are based on specimens 

 preserved in the collection of the Geological Society of London or in 

 the British Museum (Natural History). A few forms not dealt with 



