PLATE XIV. 



Spirastrella purpurea (Lmk.) Rdl. 



Fig. I. S. E. 92a. Section perpendicular to the sponge surface; combined from a series in order to show 

 the course and communication of superficial canals. The parenchyma is represented 

 by a greyish tint; X 100. 



Fig. 2. S. E. 305a. a — sj Ordinary styles and tylostyles; 5 — 55 abnormal tylostyles (?); X 300. es — xk Spini- 

 spirae; X 400. 



Fig. 3. S. E. 948b. Portion of parenchyma between two canals cc; X 400. 



Fig. 4. S. E. 305 c. Abnormal tylostyle ; X 300. 



