— 8 — 
Radula tenax Lindb. Fig. i, plant, antical view, X 80; Fig. 2, plant, pos- 
tical view, X 80; Fig. 3, single leaf, X 80. Fig. 4, cells from middle of 
leaf, X 480. 
These figures were drawn from specimens collected by the writer at 
Waterville, New Hampshire (No. 228). 
