198 
iam quinarium, Lund. Desm. Suec., 28, t. 2, f. 14. Lake, July, 
902. 
C. isthmochondrium, Nordst. Norges Desm.,12, f. 9. Lake, May- 
August, 1902. 
C. moniliforme (T'urp.), Ralfs Desm., 107, t. 17, f. 6. Side tanks 
of water-lily house, June, 1902. 
C. parvulum, Bréb. Liste Desm., 133, t. 1, f. 18. In considerable 
quantity amongst other Algae on outside walls of water-lily house. 
March, 1902. 
Calocylindrus, De Bary, 1858. 
. C. Thwaitesii (Ralfs), Cooke Brit. Desm., 126, t. 44, f. 5. Side 
tanks of water-lily house (15), June, 1902. 
Staurastrum, Meyen., 1829. 
8. striolatum, (Nàg.), Pritch. Infus., 140. Lake, August-Sep- 
tember, 1902. 
oS. punctulatum, Bréb. in Ralfs Desm., 133, t. 22, f. 1. Amongst 
Zygnema in laboratory tank (Massee !). 
*8. alternans, Bréb. in Ralfs Desn., 132, t. 21, f. T. Laboratory 
tank, July, 1897 (Wright !). 
areuatum, Nordsi. Norges Desm., 36, f. 18. Laboratory tank, 
J ne 1897 (Wright !) ; Lake, September, 1902 (mihi). 
S. polymorphum, Bréb. in Ralfs Desm., 135, 6 2, fi 93 4:24, f. 6. 
Lake, July, 1902 
S. paradoxum, Meyen. Nov. Act. Leop., xiv., 43, f. 38. 
Amongst Cladophora in ‘pond, September, 1902. idiom um p. 
V. CHLOROPHYCEAE (ISOKONTAE). 
Series 1. Siphoneae. 
i SPHAEROPLEACEAE. 
Sphaeroplea, Ag., 1824. 
S. annulina, (Roth.), Ag. Syst. . 76. “Occurred very abundantly 
in the tank near the laboratory in 1890, when the surface of the 
water was covered with an orange seum " (Massee!). I found it 
in May of this year, the tank having been cleaned out a few o3 
before (cp. Massee, Journ. Linn. Soc., Vol. xxvii, 1889, 458). 
The red oospores were first met no and soon after well-developed 
vegetative filaments were abundant. They were still present the 
following Mp but irre disappeared since then without pro- 
ducing an sexual o (ep. also Bennett in Journ. Roy 
Mieroscop. em 1897, BIL) 
