250 PROCEEDINGS: BOSTON SOCIETY NATURAL HISTORY. 
Among the American fossils the largest number of types occurs in 
the Rogers collection, especially Carboniferous plants and Tertiary 
molluscs; the Newell collection of Niagara cephalopods; a collection 
of Cretaceous plants containing many of Lesquereux’s types; Creta¬ 
ceous cephalopods described by Professor Hyatt; Triassic footprints 
described by Hitchcock and figured by Deane; and Cambrian material 
from local formations described by Dr. A. W. Grabau. Besides these 
there are many types scattered through the collection described or 
figured by various authors. 
The European collection was in a large measure the result of the 
purchase of the collection of Herr Finanzrath Eser of Stuttgart, Ger¬ 
many. At the time of its purchase this collection was known to 
contain some types, but upon working over the material lately, 
many more type specimens were found than at first were thought 
to be there. Further study may add to the present number. These 
types are mostly those described by Hermann von Meyer in the various 
volumes of Palaeontographica. There are also types described bv 
Heer and Plieninger. The listing of the types of this part of the 
collection is especially important as one would hardly look for the 
types of European species in an American museum. 
In marking the type specimens a uniform method has been adopted. 
For the original types of a species (holotype, paratypes, or cotypes) 
a red diamond-shaped card has been glued to the specimen. In the 
case of subsequent types (plesiotypes) a green card of the same shape 
has been used. This is of a size to conform to the size of the specimen 
but has been placed on all specimens even when later placed in glass 
tubes or glass-covered boxes. All types have been placed with the 
exhibition series as they are there less apt to be overlooked than when 
packed away. 
Some types which should be in the collection have not been located. 
These are here omitted entirely. 
