Platf. 13. 



Poralia rufescens. 



Fig. 1. Oral view of the best-preserved specimen. Those portions of the margin which 

 have been reconstructed are indicated by dotted outlines. Reduced one half. 



Fig. 2. Oral view of a small segment of the gastric wall, with gonads (go) ; gastric fila- 

 ments (g.f) and bases of canals (era). X 1.5. 



Fig. 3. Portion of the gastric wall, viewed from within ; (g.os) gastric ostia (openings 

 of the radial canals) ; (go) gonad ; (g) gelatinous substance of the disc. X 2. 



Fig. 4. Rhopalium, aboral view; (p) exumbral sensory pit; (s) covering scale; (r) rho- 

 palium. x 15. 



Fig. 5. Dissection of margin with side view of sense organ; (p) sensory pit, seen throtigl 

 a thin layer of the mesogloea; (s) covering scale; (oc) otocyst at the tip of tin 

 rhopalium ; (r.c) rhopalar canal. X 30. 







