232 
“mens differ markedly from the type in having the lower surfaces . 
of the leaves, as well as the petioles, peduncles and pedicels, 
densely white-tomentose. © N. L. Britton. 
& 
Reviews. 
Fossil Cycadean Trunks of North America, with a Revision of : 
the Genus Cycadecidea Buckland. Lester F. Ward (Proc. Biol. — 
Soc. Wash. 9: 75-87. April 9, 1894). : 
The author has here gathered together such information “ a 
was available regarding fossil cycad trunks found in Amen E 
They have been found in the trias of North Carolina and Prince : 
Edward Island and in the lower cretaceous of Maryland and the : 
West.. An interesting discovery, showing the value of fossil : 
plants in the correlation of strata, is briefly alluded to. In the me 
Geology of the Black Hills, by Newton & Jenney, no strata belt 
the middle cretaceous (Dakota Group) are recognized. The pre ‘ 
sence of cycad trunks, however, led the author to infer that pie : 
representing an older geological horizon, must be represent . 
there. An expedition to the locality was accordingly made ; 3 
company with Prof. Jenney, during the past year, with the res 
that a conclusion was reached that while the upper part of 
strata in question undoubtedly represent the Dakota GrouP, the : 
lower part probably extend down to the base of the cretacnyi As 
an age equivalent to that of the Maryland strata. Details es ie 
gard to the evidence upon which the conclusion was based af és 
promised in a subsequent paper. ae a 
The author has also included a revision of the genus cye oO 
coidea Buckland, in which the nomenclature is revised in gar 
ance with the law of priority. Forty-two species are enumerate’, — 
the 
only seven of which are American. One of these is from 
the a 
Black Hills locality, and is described as a new species under a 
name Cycadeoidea Jenneyana. ee 
; ra inter” 
Cycadeoidea Carruthersi is proposed to replace Mantellia 2 oe 
media Carruthers (1870), the trivial name intermedia being pie 
cupied by Cycadeoidea intermedia Ranzani (1836). _ Attem eal 
also called to the fact that Brongniart wrote the genus © 
