FRESHWATER ALGAE FROM INDIA. 287 
Genus Euastridium W. & G. S. West. 
131. E. staurastroides sp. nov. Pl. i, fig. 26. 
E. ge erica circiter 14-plo longius quam latum, profunde constrictum, 
sinu lineari angusto ; semicellulis trilobatis, lobi lateralibus semicir- 
cularibus, lobo polari subrectangulari ad basin constricto, angulis 
i , duobus 
lateribus retusis ; lobo 
polari triangulari angulis eis basis semicellularum alternantibus late- 
ribus retusis ; membrana dense serobiculata, scrobiculis super lobos 
semicellularum multo majoribus. 
Long. 98u.; lat. 59; Tat. lob. pol. 35a; lat. isthm, 2p. 
Hab. In ditch at edge of rice field, Sadiya, rare (32683). 
Only a few specimens of this species were observed, but the characters 
seemed very distinctive and sufficiently definite for them to be referred to the 
genus Euastridium as a new species. H. staurastrovdes differs. from the first 
EB. Prainit W. & G. S. West in its trira- 
of the polar lobe, and also in its 
narrow closed sinus. Otherwise the resem 
ae striking. The discovery of this new species 0 
indication of the difficulties experienc i ing sharp lines between the 
gg of this family, for besides possessing some Of 0" 
r ie Euasrum, Euastridium has also someb™™ © with Stau-— 
rastrum. This is perhaps more striking in Euast ium se des, wi 
its trigonal symmetry than in Z. Prainit. In fact, a8 Tegat s the actual form 
ge cell, E. staurastroides is very similar to Staurastrum acarides Nordst. 
r . iscovery of this new species, with different characters necessitates & 
evision of the generic characters. op 
Euastridium W. & G. S, West char. emend. aug OS 
Cellulae iis. Euastri subsimiles sed non compressae, sint gp lee 
aperto, sine incisura apicali; semicellulae @ onte visae_subtrvo 
batae, apice retuso; a latere visae ut @ fronte visae, vertice visae 
actinomorphicae, 3-8 lobatae. + i aon 
Genus Micrasterias Ag- 
Desm. 1848, p- 2 
10, t. 35, £3; Jobn- 
f, 1-4. eo 
132. M. foliacea Bail. in Ralfs Brit. 
son, Spec. Micr., 1894, P- 57, +. 6 
Long. 70p ; lat. Tip; lat. lob. pol. 32. 
Hab. With the preceding species (82683)- 
