Vv INTRODUCTION. 
Those specimens which have been presented to the Museum 
have the name of the donor marked immediately after the ha- 
bitat. When there is no such indication, the specimens have 
been either purchased or procured in exchange; and in this 
case, whenever the place or person from whom they have been 
received gives authenticity to the specimen, or adds anything 
of moment to their history, they are noted as being from such 
or such a collection or person. 
Great care has been taken to use the generic and specific 
names first given to the group or species, and a reference has 
been made to the works in which the genera and species have 
been described and figured, and in most instances the dates of 
publication of the works referred to have been added. 
I may here remark that the names quoted from the ‘Schema 
Systematis, attached to Fitzinger’s ‘ Systema Reptiliwm,’ 
1843, Svo, where the name and the type of each genus is 
given, are without characters, as the genera of lizards are 
alone characterized in that work. I have nevertheless used 
his name when I have considered it requisite to form a group 
of any of the types mentioned, rather than overburthen the 
science with other names. A list of the families and genera, 
but without the types and the subgenera and their types, 
which alone renders the list of any avail, is printed in Dume- 
ril and Bibron’s Erp. Générale, vi. 61, 1844, as extracted 
from a MSS. work which they entitle ‘ Conspectus Systematis 
Ophidiorum.’ 
I was not aware of Fitzinger’s publication when the other 
part of this Catalogue was published, or I should have re- 
ferred to it and used his names instead of the new ones I 
introduced. 
