BOTANICAL NEWS. 31 
I. PENNINERVIA. 
A. Without a distinct net of veins, 
1. Uninervia (example, Taxus baccatd). 
S. Crj^tonervia {Hippopliae rJiamnoides). 
3. Dysnervia {Elmagnus angustifolid). 
B. With a distinct net of veins, 
4. Arcunervia {Rhamnus Frangula). 
a. Acronervia {Cor^ivs mas). 
b. Proprie arcunervia {Rhamnus Frangiila) 
c. Laqneonervia {Periploca Grcecd), 
d. Eetiaervia {Berber is vulgaris), 
5! Marginervia {Carpinus Didnemis). 
II, PALMINERVIA. 
A. Without a distinct net of veins. 
6. Parallelinervia (Phoenix dadylifera). 
7. Curvinervia (JRnscus Hypophyllunt) , 
B. With a distinct net of veins, 
8. Kadionervia. 
a. Radioiiervia acrodroma {Smilax Maia-itanica) . 
b. Radionervia laqueoformia {Cerris Siliquastrtim') . 
c. Radionervia cLeilodroma {Acerplafanoides), 
The immediate effect of this publication will probably be that 
greater attention is paid to venation in Tloras, especially when it is 
found what important help may be obtained from this source in 
handling large and perplexing genera ; while the fossil botanist will 
fully appreciate this attempt to meet some of the pecuKar difficulties 
which beset his path. We can cordially recommend the work to all 
who still believe in species, and are glad of any new character that 
may help them to define species ; to the Darwinians it may be of minor 
importance, as merely recording a phase through which a portion of 
the vegetation of our globe is just passing. 
