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 :— 
Actzeon, Montfort, 1810 = Tornatella (Lamk. 1812). 
Ancilla, Lamarck, 1799 = Ancillaria (Lamk. 1811). 
Calliostoma, Bruguitre, 1840 = Ziziphinus (Gray, 1840). 
Cuspidaria, Nardo, 1840= Newra (Gray, non Rob.-Dev.). 
Dosinia, Scopoli, 1777 = Artemis (Poli, 1791). 
Gastrana, Schumacher, 1817 = Diodonta (Desh. 1846). 
Ovula, Bruguitre, 1789 = Ovulum (Sowerby &e.). 
Oxynoé, Rafinesque, 1819=Lophocercus (Krohn, 1847), 
Scutum, Montfort, 1810 = Parmophorus (Bly. 1817). 
Sistrum, Montfort, 1810 = Ricinula (Lamk. 1812). 
Turbonilla, Leach, 1826 = Chemnitzia (D’Orb. 1829). 
