latest edition of those works have extracted a table of genera 
for the convenience of those who may not have means of 
referring to them. The following are the works which I have 
mainly consulted in preparing the present Catalogue : 
Reeve’s Conchologia Iconica. Woodward's Manual of the 
Mollusca; Sowerby’s Thesaurus Conchyliorum; Pfeiffer's 
Monographia Heliceorum—Auriculaceorum and Pnewmono- 
pomorum ; and the Magazine of Natural History. 
The system of using different colors to proclaim the locality 
of the species, which had been partially adopted on the col- 
lection, has been so far retained that all Marine Shells of the 
Indo-Pacific region are mounted on Pink paper, whilst Shells 
from all other or unknown localities are mounted on Green. 
It is much to be regretted that the donors or authentic 
localities of so many shells are unknown* but this last defici- 
ency I have, wherepracticable, remedied, by adding the known 
or recorded habitat of the species. 
Those localities, ‘which appear to have been recorded by 
the donors, and from which the specimens seem to have been 
obtained, are printed in italics, which is not done with those 
* Since penning these remarks, I have come across a Report of the 
Section of Natural History signed by Messrs. Grant, Walker, Cantor, and 
Laidlay, and published in 1848, which goes far to explain the causes of 
the state in which the shell collection was. The details of this Report 
are perfectly lamentable and need not be repeated here, but I deem it my 
duty as amember of the Section of Natural History to record my very deep 
regret at the utter disregard of the views therein enunciated, and at the 
continuance down to the present hour of the same vicious, desultory system, 
which has brought such rnin on the collections of the Society, and contempt 
on its management. 
