234 Lilian Lyle. 
become confluent, or they occur in special proliferations. Hitherto 
the tetraspores of N. reptans have not been discovered. It was my 
good fortune to find a plant with a well marked line of marginal 
tetraspores exhibiting the same characteristics as those of iV. 
ramosum, Pigs. 9, 9a. 
Finisterre, PI 21, f. 140 bis. Fig. 7. Trans, sect, of N. ramosum f. reptans, 
from Crouan’s Flore de Finisterre, PI. 21, f. 140 bis. Fig. 8. Trans, sect. 
N. ramosutn. x 31 £. 
Fig. 9. Tetraspores of N. ramosum f. reptans. Half nat. size. Fig. 9a. 
Tetraspores of N. ramosum f. reptans. x 20. 
Fig. 10. Frond of N. uncinatum adhering to other algae (shaded portions). 
Half nat. size. Fig. 11. Sucker-like appendages of N. uncinatum. x 20. 
Fig. 12. Cells from frond of N. uncinatum. x 62. Fig. 13. Procumbent 
portion of Gelidium crinale. x 20. 
The procumbence of N. reptans is probably of advantage to it 
under conditions which would be inimical to an erect position, e.g. f 
where exposed to great force of waves, moving stones, etc. This 
plant is moreover distinctly an inhabitant of deep water. 
N. reptans therefore merely ranks as a form to be expressed 
thus, Nitophyllum ramosum f. reptans. It may possibly even come 
to be considered only a growth phase. 
A. D. Cotton in his Clare Island Survey suggested a possible 
connection between N. reptans Crn. and N. uncinatum J. Ag. 
