Fig. 1. 
Fig. 2. 
Fig. 3. 
Fig. 4. 
Fig. 5. 
Fig. 6. 
PuaTE 15. 
Plumularia helleri, page 18. 
A colony, natural size. 
Part of acolony. x 75. 
The basal portion of a stem. x 60. 
Part of the main stem of a second colony. x 50. 
A pinna from figure 4. x 50. 
An internode enlarged. x 125. 
ak area 
