60 Annals of tlie South African Museum. 



the body of my work, but, to facilitate distinction, the reference 

 number is printed in ordinary type before recent species, and in 

 italics before those which have only been found, so far, in a fossil 

 condition in South Africa. 



A list of authors and works consulted, with the abbreviations used, 

 is given on p. 288. Owing to the great increase of recent literature 

 on the subject, the list of references under each species has been 

 lightened by the omission of all those of a purely "check-list" 

 character, or of no actual value to the student. 



Many comparatively unimportant references to classification or 

 locality only are also omitted, the authority quoted after each 

 locality being, in the latter case, considered sufficient. 



I have also omitted many of the older references to European 

 and American species, as the descriptions contained in them are 

 of little value. 



The letters A. (anatomy), 



D. (description, external), 

 F. (figure, external), 



L. (locality), 

 N. (note), 



E. (radula), 



are appended respectively to each reference to denote the class of 

 information it contains. 



With regard to Ferussac's Tabl. Syst. des Moll., part iii., of which 

 there were two editions in the same year, with different pagination, 

 the alternative pages are given. 



The species described and figured by Sturany in Sudafr. L.- und 

 S.-W.-Moll., November, 1898, were first published by him in a 

 "Preliminary Note " in the Anz. kais. Akad. Wiss. Wien, in June 

 of the same year. I have not, in this instance, quoted the earlier 

 reference, except in the case of Chondrocyclus isipingoensis, where 

 priority of nomenclature is involved. 



The present work is intended, primarily, to be of as much use as 

 possible to students in South Africa. This accounts for my having 

 appended full references to Genera and the higher divisions, many 

 of which I have found it quite impossible to trace in any library 

 in that country ; and also for the addition of as many localities 

 for each species as I have been able to gather; but it has been, 

 naturally, quite impossible to verify the correctness of all of the 

 latter. Many of the older specific names have been misapplied, at 

 Various times, to other species, while many recently described shells 



