434 Mr. T. Davidson on Lamarck’s species of 
my sincere thanks to those gentlemen of the Garden of Plants 
for the great confidence they reposed in me, and for the unlimited 
assistance they have always shown to those who take an interest 
in the study of science. 
All the species described were not however to be found in the 
collection of the Garden of Plants; the greater number belonged 
to Lamarck’s private collection, which became at his death the 
property of the Prince Massena, who sold them to M. le Baron 
Benjamin Delessert, and which now form part of his extensive 
and celebrated museum. M. Chenu, Curator of that Museum, 
in the most liberal manner placed at my disposal the remainmg 
type specimens of Lamarck’s collection. The specimens from 
the Garden of Plants are all ticketed by M. Valenciennes, the ori- 
ginal describer ; all those in B. Delessert’s collection are labeled 
by Lamarck himself. M. Valenciennes has also, in the kindest 
possible manner, given me all the information in his power rela- 
tive to some of the species which had presented any difficulty. 
The original monograph of Fossil Terebratulz, published thirty 
years ago (1819), was one of the first works written by the justly 
celebrated Valenciennes, and appeared at a time when little was 
known on the subject, and it is but justice that those species 
then established should be retained in the nomenclature where 
no objections exist. At that period authors were not in the 
habit, or rather did not feel so much the importance, of giving 
any reference to locality or strata; they simply contented them- 
selves with a short Latin description of the outer form of the 
object under examination, so that with very few exceptions there 
exist no positive data as to the locality or geological position of 
the specimens in Lamarck’s work. There is also some difficulty 
in a few cases of defining which were Lamarck’s real types, as 
several specimens of different species are sometimes placed on 
one tablet, the description of which is adapted to more than one 
form ; and lastly, it is possible that some of the specimens now 
in B. Delessert’s hands may have been displaced while in the 
possession of Prince Massena. I have however compared as care- 
fully as possible the specimens with the descriptions, and by the 
kind assistance of M. Valenciennes (where doubts existed) am 
able to lay before the public the figures of each species drawn 
from the types on which they were established. I must however 
add, that in some few cases the specimens belonging to Lamarck’s 
collection were in bad condition, which I have restored in the 
figures from well-preserved specimens of the identical species in 
my own collection, in order to prevent misconceptions as to the 
shells intended as types. I have also thought it advisable in the 
text and in the plates to preserve the same order and numbers as 
used in Lamarck’s sixth volume (1819); and in order to keep 
