iv PREFACE. 



completeness with which I have have been enabled to accom- 

 plish the task has been due to a great extent to the zeal of 

 John H. Ponsonby, Esq., through whom I have received a large 

 proportion of the material, and to the kindly and courteous 

 aid rendered to me by Edgar A. Smith, Esq., of the Zoological 

 Department, British Museum. Lastly, I have had the 

 advantage of thoroughly examining the collection formed at 

 Port Elizabeth by S. D. Bairstow, Esq., F.L.S., recently 

 presented by him to the Oxford University Museum, which 

 contains a fair proportion of my types. 



The present Catalogue may be regarded as a supplement 

 to the excellent work of Dr. Ferdinand Krauss published in 

 1848. 



It will be observed that some of the generic names are 

 not the same as those in common use, and differ from those 

 in the ' Thesaurus Conchyliorum,' * Conchologia Iconica,' 

 and other standard works. These names I am compelled to 

 adopt by the inexorable law of priority, but the following 

 list will render them intelligible : 



Actreon, Montfort, 1810 = Tornatella (Lamk. 1812). 



Ancilla, Lamarck, 1799 Ancillaria (Lamk. 1811). 



Calliostoma, Bruguiere, 1 840 = Ziziphinus (Gray, 1840). 



Cuspidaria, Nardo, l8Q = Necera (Gray, n on Rob.-Dev.). 



Dosinia, Scopoli, 1777 = Artemis (Poli, 1791). 



Gastrana, /Schumacher, 1817 = Diodonta (Desh. 1846). 



Ovula, Bruguiere, 1789 = Ovulum (Sowerby &c.). 



Oxynoe, Rafinesque, \8l9 = Lophocercus (Krohn, 1847). 



Scutum, Montfort, 1810 = Parmoplorus (Blv. 1817). 



Sistrum, Montfort, 1810 = Ric'mula (Lamk. 1812). 



Turbonilla, Leach, 1826 = Chemnitzia (D'Orb. 1829). 



