DESMIDS FROM SINGAPORE, 161 
Var. RopusTUM, n. var. (PI. 8, fig. 20.) 
Var. angulis basalibus semicellularum rectangularibus et 
rotundatis, apicibus latioribus. 
Long. 86 p; lat. 44; lat. apic. 27 u; lat. isthm. 11°5 p. 
This variety differs from var. subangulare, West & G. S. 
West, Trans. Linn. Soc. Ser. II. (Bot.) v. (1895) p. 50, t. 6. f. 15, 
in the broader apices and the different basal angles. 
22. E. QUADRIOCULATUM, n. sp. (PI. 9. figs. 5, 6.) 
E. submediocre, circiter duplo longius quam latius, profunde 
constrictum, sinu angusto-lineari extremo subampliato; semi- 
cellule subtrilobatz, lobis lateralibus emarginatis et lateribus 
convergentibus sursum, lobo polari subrectangulari angulis 
rotundatis, incisurá mediana profunda lineari, in centro tumoribus 
binis horizontaliter dispositis; a vertice vis: elliptiez, in medio 
utrobique tumoribus binis instructz ; a latere visse truncato- 
ovate, tumore prope medium utrobique; membrana punctata. 
Long. 38-40 u ; lat. 20-22 u ; lat. apic. 125-145 p; lat. isthm. 
95-65 u; crass. 1575 p. 
23. E. COSMARIOIDES, West d G.S. West, in Trans. Linn. 
Soc. Ser. IT, (Bot.) v. (1895) p. 54, t. 6. f. 23. 
Var. currum, West d G. S. West, in Journ. Bot. xxxv. 
(1897) p. 84. 
Long. 18-22 u; lat. 18-19 u ; lat. apice. 16-18 p ; lat. isthm. 
5-55 u; crass. 11 u. (Pl. 8. figs. 18, 19.) 
In front view the specimens from Singapore correspond 
exactly with those from Africa, but differ somewhat in the other 
views. The vertical view is elliptical and is without the 
‘welling on each side possessed by the original examples. 
24. E. DENTICULATUM, F. Gay, in Bull. Soc. Bot. France, XXXi. 
(1884) p. 335, 
Long. 20 1; lat. 15 u; lat. isthm. 35 p. 
v E. BINALE, Ehrenb. (Ralfs, Brit. Desm. p. 90, t. 14. £. 8.) 
Ag. ELOBATUM, Lund. Desm. Suec. p. 23, t. 2. f. 7. 
lat n not quite agreeing with Lundell’s figure; long. 23 u; 
185 p; lat, apic. 13 p; lat. isthm. 5'5 u. (Pl. 8. fig. 11.) 
