Mededeelingen van 's Rijks Herbarium Leiden. 
No. 24. List of the species of Calamites with 
enumeration of the figures as far as they are 
doubtful or indeterminable or belong 
to other species 
BY 
W. J. JONGMANS. 
This list is the first result of my researches in literature and in 
different museums. Dr. KipsronN looked over the many photographs 
and notes made for this purpose and in writing the text of our 
Monograph of the Calamites of Western Europe we found the occa- 
sion to controlize the conclusions. The comparison with the nume- 
rous beautiful specimens in Dr. KrpsronN’s collection and the many 
conferences we had on the critical figures and specimens lead to 
the result given in this list. 1 am glad to have in the publication 
of this list another opportunity to offer my sincere thanks to Dr. 
KipsroN for his collaboration and for so many kind helps. 
This list contains the names used for species of the genus Cala- 
mites sensu ampliss. (incl. Arthropitys, Calamodendron. etc.). From 
species not oecuring in palaeozoic deposits, it brings the names 
only and no further critical remarks. 
Published figures of species, which cannot be regarded as true 
species and such figures, which are wrongly named (according to 
my present opinion) are mentioned here with a short quotation of 
the literature and of the species to which the figure must be put 
as a synonym. 
The list also shows that a large number of published figures must 
be regarded as doubtful or indeterminable. 
It does not contain those figures of recognized species which have 
been published under the name which Il accept as the right one. 
Full lists of all such figures can be found in: KipstToN and Jonc- 
