346 ON A COLLECTION OF BLUE-GREEN ALG. 
would have been impossible to publish it in the present form. To Professor 
S. R. Kashyap of the Government College, Lahore, I am indebted for many 
suggestions and for the keen interest which he took in connection with this 
work, while I was in India. 
East London College, 
(University of London), London. 
EXPLANATION OF PLATE 31, 
Fig. 1. Chamesiphon filamentosa, sp. n., different stages of gonidium-formation. (a, x 350; 
b, c, d, x 700.) 
Fig. 2. Oscillatoria princeps, Vauch., var. pseudo-limosa, var. nov. a, apical portion of an 
ordinary thread; b, a slightly curved and tapering apex. (Xx 250.) 
Fig. 3. Phormidium truncicola, sp. n., a portion of the stratum. (Xx 350.) 
Fig. 4. Arthrospira spirulinoides, sp. n. (X 350.) 
Fig. 5. Lyngbya Kashyapu, sp. n. (x 350.) 
Fig. 6. Lyngbya truncicola, sp. n., portion of a filament. (X 420.) 
Fig. 7. Lyngbya circumcreta, G. S. West, var. gelatinicola, var. nov. a, a single filament ; 
b, apex. (X 840.) 
Fig. 8. Anabena gelatinicola, sp. n. a, a coiled and b, a young straight filament ; c, spore- 
formation; d, mature spores. (x 350.) 
Fig. 9. Aulosira fertilissima, sp. n. a, vegetative filaments; 6, e, pseudo-branching ; 
e, germination of a spore while in the filament; d, mature spores separated by 
biconcave cells. (x 350.) 
Fig. 10. Tolypothrix Wartmanniana, Rabenh., portion of a filament with spores and inter- 
calary cells. (After Borzi, x 210.) 
Fig. 11. Seytonema Fritschü, sp. n. a, filaments showing pseudo-branching; b, single 
heterocyst; c, four heterocysts in a series; d, constricted sheath. (a, x 85; 
b, c, d, x 350.) 
Fig. 12. Tolypothrix  campylonemotdes, sp. n. a, curved filaments; b, sheathed “ pseudo- 
hormogonia "; e, a young hormogone which has emerged from the sheath; d, e, 
single pseudo-branching; /, geminate pseudo-branching. (x 250.) 
Fig. 13. Tolypothrix conglutinata, Borzi, var. colorata, var. nov. a, richly branched filaments ; 
b, geminate pseudo-branching. (x 250.) 
