— 170 — 
Var. sureulifera Lagerh. in Bih. till K. Sv. Vet.-Akad. Handl. Bd. 13, 
no. 9, 1888, p.5, t. I, f. i. 
Long. 98 4; lat. 1004; lat. isthm. 18; crass. 49. 
In muddy ricefield. 
Area: India and Ceylon. 
54. M. Mobii West & G.S. West in Journ..Linn. Soc. bot. XXXII, 
1897, p. 162. Ewustrum verrucosum Ehrenb. var. Mébii Borge in Bih. 
till K. Sv. Vet.-Akad. Hand]. XXII, no. 9, 1896, p.13, t. II, f. 18, 19. 
E. verrucosum forma Mébius in Abhandl. d. Sencknb. naturf. Ges. Frank- 
furt a.M. 1894, Bd. 18, p. 340, t.II, f. 21. 
M. mediocris, circiter 11/s-plo longior quam lata, profunde con- 
stricta, sinu leviter aperto ad extremum lineari et subampliato 
(nonnunquam sinu angusto-lineari extremo ampliato et aperto 
extrorsum); semicellule trilobe, incisuris latis et rotundatis; lobo 
polari multo majori, incudiformi, late expanso cum collo latissimo, 
apice convexo sed in medio late et leviter retuso, extremitatibus 
lateralibus emarginato-truncatis ; lobis lateralibus breviter subtrapezi- 
formibus, leviter bilobulatis, lobulo superiori minori cum apice un- 
dulato-truncatis, lobulo inferiori majori cum margine levissime et 
subirregulariter undulato; in centro semicellularum tumore magno 
dense scrobiculato, tumore minimo intra lobum lateralem unum- 
quemque; membrana cellularum irregulariter et minute granulata; 
a vertice visze oblongo-elliptice tumore magno utrobique, polis 
rotundatis, lobo polari oblongo-subrectangulari, lateribus convexis, 
polo unoquoque in processus crassos breves divaricatos duos pro- 
ducto, lobulo superiori lobi lateralis uniuscujusque in processus 
breves divaricatos duos furcato; a latere visae truncato-ovatee, late- 
ribus in parte superiori concavis. 
Long. 111—117 »; lat. 90—36 y; lat. lob. polar. 76—80 yp; lat. 
isthm. 28—31 ; crass. 59—60y. (Tab. nostr. III, fig. 21.) 
We have previously shown this plant to be a Micrasterias and not 
a species of Euastrum (cfr. Journ. Lin. Soc. 1897, p. 162), but we give 
here for the first time a complete description of the typical plant. It 
stands nearest to Micrasterias Americana Ralfs. 
In stagnant water in the jungle, abundant amongst Micrasterias Mahabu- 
leshwarensis and various Palmellacee. 
Area: Australia (Northern Queensland) Also var. Ridleyi from Singapore. 
Var. tetrachastriformis West & G. S. West, n. var. (Tab. nostr. III, 
fig. 22). 
Var. lobis lateralibus reductis, lobulo inferiori attenuato et sub- 
emarginato, lobulo superiori parvo et acute conico; extremitatibus 
lobi polaris plus attenuatis. 
Long. 108—120 »; lat. 88-111 4; lat. lob. polar. 82—96 p; 
lat. isthm, 24—31 p. 
This variety, which occurred in a muddy ricefield, is easily distin- 
