64 DR. б. $. WEST ON THE ALGÆ OF 
92. COSMARIUM SUBTRIORDINATUM, W. у G. 5. West, in Journ Bot., April 
(1897), p. 122, t. 368. fig. 11. 
Forma ad var. rotundatum, Schmidle, accedens, sinu extrorsum plus 
ampliato ; granulis magnis (vel verrucis) paucis 8-9 in centro semicellularum 
in seriebus verticalibus multe irregularibus tribus. 
Long. 24 ш; lat. 24 p; lat. isthm. 6'5 р; crass. 145 ш. (РІ. 4. fig. 6.) 
Hab. Yan Yean Reservoir, in the plankton (Feb. and Mar. 1905, and 
Feb. 1906) and at the weedy margins (Mar.-May, Nov. and Dec. 1905, and 
Jan. 1906). 
This Cosmarium was never abundant, but for about six months it occurred 
sparingly in the weed collections. It differs from the original African form 
principally in the more open sinus, in which feature it agrees with the 
var. rotundatum described by Schmidle from Zanzibar and Mozambique (vide 
Engler, Bot. Jahrbüch. xxvi. (1898) p. 36, t. 2. fig. 21). 
33. CosMARIUM AMŒNUM, Bréb. in Ralfs, Brit. Desm. (1848) p. 102, t. 17. 
fig. 3. 
e 
Var. MEDIOLÆVE, Nordst. in K. Sv. Vet.- Akad. Handl. xxii. no. 8 (1888), 
р. 50, t. 5. fig. 12. 
Long. 45-54 р; lat. 26-32 д; lat. isthm. 9-10°5 p ; crass. 16°5-17°5 p. 
Hab. Yan Yean Heservoir, at the weedy margins. 
This Desmid was fairly general throughout the year at the weedy margins 
of the lake, reaching its greatest abundance in February. It was also 
frequent at Heidelberg, Victoria, in March 1905. The specimens were in all 
cases smaller than those described from New Zealand, having dimensions 
more in accordance with the typical plant. The granules of this variety are 
much smaller than in the type form, and not only are they wanting in the 
centre of the semicells, but their arrangement is quite different. 
34. Cosmarium Hanpvr, G. 5. West, in Victorian Naturalist, xxii. (1905) 
р. 72 ; in Journ, Bot. xliii. (1905) p. 253. 
C. mediocre, circiter 1}-plo longius quam latum, profunde constrictum, 
sinu breviter lineari extremo ampliato et extrorsum valde aperto; semicellulæ 
subspherico-semicirculares, lateribus et angulis inferioribus late rotundatis 
granulis minutis subpapilliformibus instruetis, apice levissime truncato et 
glabro, intra margines laterales et infra apicem granulis minutissimis irregu- 
lariter ordinatis præditæ ; in parte magna mediana semicellularum cum 
scrobiculis confertis quincuncialiter ordinatis; a latere vise subspherice, 
apice subdepresso-truncato; a vertice vise late elliptice et latissime tumida 
utrobique, polis granulato-subpapillatis, lateribus scrobiculatis. 
Long. 84-89 р; lat. 56-61 ш; lat. isth. 20-22 ш; crass. 50-52 и, (PI. 4. 
fig. 8.) 
Hab. Yan Yean Reservoir, in the plankton throughout most of the year 
