156 MESSRS. W. WEST AND G. 8. WEST ON 
Desmids from Singapore. /By W. Wzsr, F.L.S., and 
G. S. Wet, A.R.C.S. 
[Read 6th May, 1897.] 
(PrArEs 8 & 9.) 
Tue Desmids recorded in this paper were observed in a small 
collection of Algæ kindly made for us by H. N. Ridley, Esq., 
M.A., in Singapore. The number of species, forty-five, is not 
very great, but there are some very interesting ones, conspicuous 
among which are Micrasterias anomala, W. B. Turn., and Cos- 
marium Askenasyi, Schmidle. In 1895 asmall paper appeared by 
Prof. Schmidle in Hedwigia, xxxiv., entitled “ Einige Algen aus 
Sumatra"; and as little is known concerning the Alge of this 
part of Asia except his list, the present paper is all the more 
interesting. 
The following seven species found in the material from 
Singapore are also recorded from Sumatra :— Ewastrum obesum, 
E. ansatum, Cosmarium Askenasyi, C. connatum, C. Hammeri, 
C. pachydermum, and C. subglobosum. 
CYLIN DROCYSTIS, AMenegh. 
l. C. crassa, De Bary, Unters. Fam. Conj. pp. 87, 74, t.1. 
f. C 1-12. 
Long. 3l p; lat. 24 y. 
PENIUM, Bréb. 
2. P. LIBELLULA, Nordst. in Vidensk. Meddel. Kjób. 1888, 
p. 184. Closterium Libellula, Focke. Penium closter ioides, Ralls 
Forma rwTERRUPTA, West, in Journ. R. Micr. Soc. (1892) 
p. 721. 
Long. 163 u; lat. 29 y. 
Var. INTERMEDIA. Roy, in Ann. Scott. Nat. Hist. (1894) P m 
Long. 138 u ; lat. 21 p. 
3. P. Navicuna, Bréb, in Mém. Soc. Sci. Nat. Cherb.i. (1850) 
p. 146, t. 2. f. 37. 
