174 MESSRS. W. WEST AND G. S. WEST ON 
centro semicellularum granulis maximis tribus horizontaliter dispositis et serie 
granulorum minorum 4 supra granula maxima 3; a vertice visse ellipticee, granulis 
maximis tribus ad medium utrobique, polis denticulato-spinatis; a latere visse sub- 
circulares, granulis magnis 2 supra medium utrobique, apicibus denticulatis. 
Long. 30 »; lat. (cum spinul.) 30 u; lat. isthm. 8 u; crass. 17 u. 
Hab. Paddyfields, Heneratgodha. 
212. CosMARIUM CEYLANICUM, sp. n. (Pl. 21. figs. 14, 15.) C. submediocre, 14-14-plo 
longius quam latum, profundissime constrictum, sinu angusto-lineari extremo 
ampliato ; semicellule pyramidato-trapeziformes, angulis inferioribus subrotundatis, 
lateribus leviter convexis 5-6-noduloso-granulatis, angulis superioribus denticulo 
prominenti singulo preeditis, apicibus truncatis leviter convexis cum serie granu- 
lorum depressorum magnorum 4 infra et juxta marginem, in centro semicellularum 
verrucis depressis rotundatis 3 (cire.) et annulo scrobiculorum 5-6 circa verrucam 
unamquamque ` a vertice visz elliptiez, polis rotundo-truncatis, bidenticulatis, 
verrucis depressis tribus ad medium utrobique; a latere visee obovato-circulares, 
verrucis depressis binis ad medium et granulo magno prope apicem utrobique; 
pyrenoidibus binis. 
Long. 33-42 u; lat. 30-33 u; lat. apic. semicell. 13:5-15:5 u; lat. isthm. 5:5-75 u; 
crass. 22 u. 
Hab. Paddyfields, Heneratgodha. 
213. CosMARIUM WALLICHII, nob. Luastrum Clepsydra, G. C. Wallich, in Ann. & Mag. 
Nat. Hist. ser. 3, v. 1860, p. 284, t. 14. figs. 19-21; W. B. Turner, in K. Sv. 
Vet.-Akad. Handl. xxv. 1893, no. 5, p. 76, t. 9. fig. 51. 
Long. 26:5 u; lat. 27°5 u; lat. isthm. 8 u; crass. 15 y. 
Hab. Yn artificial tank, Peradeniya. 
This plant undoubtedly belongs to the genus Cosmarium and not to Euastrum, 
being similar in outline to such species as C. porrectwm, Nordst. Two species of 
Cosmarium have already been given the name “C. Clepsydra" (cf. Nordst. in Vidensk. 
Medd. natur. Foren. Kjóbenhavn, 1869, p. 212, t. 3. fig. 29; and Delponte, in Mem. 
Accad. Sci. Torino, ser. 2, xxx. 1877, p. 8, t. 7. figs. 35, 36), so that the name 
“0. Wallichii " had to be adopted. 
Genus SPONDYLOSIUM, Bréb. 
214. SPONDYLOSIUM COMPACTUM, sp.n. (PI. 22. figs. 29, 30.) S. parvum, filis non tortis, 
sine vagina mucosa ; cellule circiter tam longe quam late, subquadrate, profunde 
constrictze, sinu lineari; semicellulee oblongo-rectangulares, angulis subrotundatis, 
lateribus subrectis, apicibus leviter concavis; semicellulz a vertice vise elliptico- 
oblongze, a latere visse subcirculares; membrana glabra. 
Long. cell. 99:5 p; lat. 9°5 u; lat. isthm. 3*4 u; crass. 4'6 p. 
Hab. Paddyfield between Kosgoda and Urahaighasmahendai. 
Owing to the concave nature of the apices there is a small aperture visible between 
any two contiguous cells of the filament. 
o ATTE NER CUR A oe x : ; 
— ea a (iar n 1r I alee EE i i ld a a ee 
