ON ©. CALISAYA, VAR. LEDGERIANA, AND C. LEDGERIANA. 817 
A. Leighsmithiana, O'M. 
(Probably A. Erebi, Ehrenb., 
and A. cymbifera, p. p., 
forms with costate stris.) 
Chetoceras borealis, Bail. 
C. decipiens, Cl. 
Cocconeis glacialis = Navi- 
cula glacialis, Cl. 
Coscinodiscus centralis, Ehrenb. 
C. excentricus, Ehrenb. 
C. radiatus, Ehrenb. 
C. subtilis, Ehrenb. 
Fragilaria striatula, Lyngb. 
Navicula arctica, Cl. 
N. didyma, Ehrenb. 
N. fortis, Greg. - 
N. liber, W. Sm. 
N. Smithii, Bréb. 
N. subsalina, Donk. 
Nitzschia angularis, W. Sm. 
N. Closterium, Ehrenb. 
N. sigma, Kütz. 
Melosira sulcata, Ehrenb. 
(Orthosira marina, W .Sm.). 
Pleurosigma angulare. 
P. longum, Cl. 
Podosphenia gracilis, Ehrenb. (May be Licmophora Jurgensii, 
Ag., which is common in the gathering from Bessel’s Bay.) 
Raphoneis Quernerensis, Grun. 
Synedra fulgens, Grev. 
S. superba, W.Sm. These two species I have never observed in 
the arctic seas. A small form of S. superba (var. minor, Grun.) 
has been seen by Mr. Grunow in a gathering from Finmarken. 
I think the determinations may probably be incorrect. 
The number of additional species found by Dr. Dickie, but not 
by myself, amounts to 27, Achnanthes longipes, Podosphenia gra- 
cilis, Synedra fulgens, and S. superba not being counted. The total 
number of marine diatoms from these high latitudes amounts 
then to 86. 
On Cinchona Calisaya, var. Ledgeriana,,How., and C. Ledgeriana 
(Moens). By Jonny Error How an E.R.S., F.L.S. 
[Read May 3, 1883.] 
In the year 1866 I communicated to the Botanical Congress held 
in London some observations on the present state of our know- 
ledge of the genus Cinchona, in which I quoted * Mr. Markham’s 
observation that “the Cinchona Calisaya, the most famous of all 
the South- Ameriean bark-trees, and which in its native forests is 
* ‘Report of Proceedings of the Internat. Horticult. Exhib. and Bot. 
Congress,’ p. 199 (1866). 
