Professor Seward's “ Fossil Plants 
235 
the plants described, such as Wielaudiella and Williamsoniella , 
must have been totally different in habit from anything which we 
associate with Cycads. 
The two concluding chapters contain an account of stems and 
fructifications other than those clearly referable to Bennettitales, 
and of Cycadophytic fronds generally. It is remarkable how scanty 
is the evidence for the occurrence of true Cycadaceae in the 
Mesozoic Floras, though it seems to be sufficiently proved that they 
were present. 
The Bibliography extends to Vol. IV as well asVol. III. When 
the book is completed a single Bibliography for the whole would be 
convenient. 
The concluding volume will deal with the remaining Gymno- 
sperms—Ginkgoales and Conifers—and we may no doubt hope for 
some further discussion of the general results of palasobotanical 
research. 
The volume which we have briefly considered not only shows 
the author’s unrivalled acquaintance with the literature of his 
subject, but is at the same time a record of extensive personal 
researches. In addition to his important original work, the author 
has re-investigated a number of the fossils for the purposes of this 
work, and has often illustrated their structure by new figures. 
The volume is thus of equal value to the investigator and to the 
University student. 
D. H. S. 
