PLATE XX. 
Fig. 1. 
Fig. 2. 
Fig. 3. 
Fig. 4 
Fig. 5 
Costaria Turneri Grev. 
Habit of a plant from Otaru Harbour, Prov. Shiribeshi. x 0.16. 
Basal part of a frond, x 0.26. 
Cross section through the upper part of the stipe, x 1.6. 
Cross section through the lower part of the stipe, x 1.6. 
Cross section of the blade, x 0.4. 
