798 The American Naturalist. ` [September, 
productum Al. Braun., A. pseudocreticum Ett., A. tricuspidatum 
Al. Braun, A. tricuspidatum subintegerrimum Al. Braun., A. tri- 
lobatum (Sternb.) Al. Braun., A. trilobatum genuinum Engelh., A. 
trilobatum patens Al. Braun., A. trilobatum productum Al. Braun., 
A. trilobatum tricuspidatum Al. Braun., Acerites deperditum Mass., 
A. ficifolius Viv, A. incerta Mass., Cissus platanifolia Ett. 
Quercus platanoides Göpp., Q. rotunda Göpp. 
He regards Platanus academie Gaud., P. dissecta Lx., and P. 
appendiculata Lx. as varieties of P. aceroides Göpp., the last two 
as identical. 
To P. gulielme Göpp. he refers P. aceroides var. Heer, from 
Greenland. . 
He recognizes P. marginata (Lx.) Heer, the Viburnum margin- 
atum of Lesquereux’s earlier works, as a true Platanus. 
He considers P. heerü Lx. a variety of P. primeva Lx. 
He excludes from the genus Platanus the following : P. affinis 
Lx, P digitata Ung., P. diminutiva Lx., P. dubia Lx, P. 
hercules Ung., P. jatrophefolia Ung., P. latiloba Newb., P. 
nobilis Newb., P. obtusiloba Lx., P. recurvata Lx., P. sirii Ung. 
A number of these have been, of course, long ago abandoned ; 
but of the American forms, P. diminutiva, P. nobilis, P. obtusiloba, 
and P. recurvata had not been hitherto challenged. 
He ignores the following species: P. antigua Watelet, P. 
aspera Newberry, P. basilobata Ward, P. borealis Caspary, P. 
dubia Watelet, P. heterophylla Newberry, P. klebsü Caspary, 
P. papilloni Watelet, P. subintegra Göpp. 
Watelet's species were so imperfectly figured and characterized 
that little could be said of them, and he was perhaps justified in 
passing them by unnoticed. Still less was he called upon to take 
account of those of Caspary and Newberry, and the last one on 
the above list, none of which have, to my knowledge, ever been 
figured. He was entirely unacquainted with the works of the 
present writer in which P. basilobata has been made known, VIZ., 
the “ Synopsis of the Flora of the Laramie Group," * Types of 
the Laramie Flora," and * Paleontological History of the Genus 
Platanus.” The last-named paper was sent to him as soon as his 
address could be found, and he has acknowledged it, and sent 1n 
