THE FRESHWATER ALGÆ OF CEYLON. 151 
although somewhat irregular, are neither truncate nor subemarginate like those figured 
by Schmidle. 
112. EuasTRUM BELLUM, Nordst. in Vidensk. Medd. naturh. Foren. Kjóbenhavn, 1869, 
p. 218, t. 2. fig. 6. 
Var. MADAGASCARIENSE, West & G. S. West, in Trans. Linn. Soc., Bot. ser. 2, v. 1895, p. 49, 
t. 6. fig. 7. 
Forma lobo polari dilatato, denticulis ad basin semicellularum nullis. 
Long. 57 u; lat. 424; lat. lob. polar. 164; lat. isthm. 10,4; crass. 21 p. (Pl. 20. 
fig. 4.) 
Hab. With the preceding species. 
113. EUASTRUM GEOMETRICUM, sp. n. (Pl. 20. figs. 7, 8.) E parvum, circiter 14-plo 
longius quam latum, profunde constrictum, sinu lineari in medio et in fundo 
ampliato; semicellule quadrato-trapeziformes, subtrilobe, incisuris lateralibus 
profundis angusto-linearis; lobis lateralibus subquadratis, lateribus inciso-emar- 
ginatis, lobulis angulari-rotundatis; lobo polari late oblongo-rectangulari, apice 
convexo, incisura mediana profunde in fundo ampliata, angulis lateralibus 
denticulo singulo instructis, dentieulis binis ad marginem apicalem utrobique 
(altero supra marginem altero infra marginem et prope incisuram); tumoribus 
tribus in serie transversa trans basin semicellularum, tumoribus binis inter incisuras 
laterales, granula singulo in lobulo laterali unoquoque et in divisione unaquaque 
lobi polaris; a vertice vise elliptice, tumoribus tribus utrobique; a latere vise 
ovate, tumore magno ad basin et tumore minore prope apicem utrobique, apicibus 
tridenticulatis. 
Long. 40 4; lat. 26; lat. isthm. 7'5 u; crass. 17 u. 
Hab. Paddyfields, Heneratgodha. 
114. EUASTRUM PLESIOCORALLOIDES, sp. n. (Pl.20.figs.5,6.) E. parvum, 14-plo longius 
quam latum, profundissime constrictum, sinu angusto-lineari extremo ampliato; 
semicellulee pyramidato-quadrate, trilobze, incisuris lateralibus profundis et angustis ; 
lobis lateralibus quadrato-trapeziformibus, marginibus lateralibus cum incisura 
mediana aperta sed non profunda, lobulis emarginatis, angulis lobulorum aeutis ; 
lobo polari subelliptico, angulis lateralibus emarginatis, apice leviter elevato cum 
incisura mediana profunda angusta; tumoribus tribus in serie transversa trans basin 
semicellularum, tumoribus binis intra lobum polarem, granulis paucis intra marginem 
loborum lateralum polarumque, serobiculis paucis in centra semicellularum ; a vertice 
visæ anguste elliptieze, polis subrotundatis et granulatis, tumoribus tribus utrobique 
(tumore centrali emarginato). 
Long. 34°5-38°5 u ; lat. 25-28 n; lat. isthm. 5:5-6:5 4; crass. 16 a. 
Hab. Paddyfields, Heneratgodha. 
This species somewhat resembles E. coralloides, Josh., var. trigibberum, Lagerh. (in 
Bih. K. Sv. Vet.-Akad. Handl. 1888, xiii. Afd. 3, no. 9, p. 6; cfr. also Borge, l. c. 
