PREFACE. 
Vll 
inserted the species of the rest of the world, as represented 
in the collection, wherever I thought they could be most con- 
veniently placed. 
The references given in the catalogue under each species 
are ; (1) to the original description, (2) to some work where the 
species is treated of either as regards its geographical dis- 
tribution or its classification. In almost every case where 
Strickland has mentioned a species, even incidentally, in his 
writings, I have given the reference ; and also the synonyms, 
if any, under which the species was named in the collection. 
Where, however, a species appears to me to have been wrongly 
determined, I have not thought it expedient to quote the wrong 
name unless the statement had been published. 
As this Catalogue has been a longer time in passing 
through the press than I at first anticipated (it contains about 
12000 references), several recent important works could not be 
quoted in the earlier portion. 
In preparing the Catalogue, and in re-arranging the col- 
lection in conformity therewith, I must gratefully acknowledge 
the patient help which I have constantly received from 
Mrs H. E. Strickland, without whose minute and accurate 
knowledge of almost every individual specimen, my attempts to 
trace their history would have resulted only in failure. To Mrs 
Strickland I am also indebted for the following list, shewing 
the sources whence the collection was derived. To this I have 
added the approximate number of specimens to be referred to 
each. 
It remains to be said that the collection was presented to 
the University of Cambridge by Mrs Strickland in 1867 
under conditions which will be found in the Ordinationes 
Academics Cantabrigiensis (ed. 1877, p. 208) ; and that the 
chief events of Strickland’s life are told in his Memoirs by 
his father-in-law, the late Sir- William Jardine, published in 
1858, to which is added a selection from his principal scientific 
papers. 
