ACTiNIARIA 



Fig- I. 



Fig. 2. 



Fig. 4- 



Fig. 5- 



Sideractis glacialis. Textfig. I. Transversal section through one part of the column (co), a perfect and an imperfect mesentery at the 



transition of the actinopharynx in the filaments. Fig. 2. longitudinal section through the distal part of a tentacle. Fig. }. Transversal 



section through the actinopharynx and the bases of the mesenteries (me). Fig. 4. Part of the tentacle in section, showing the papillae 



containing spirocysts. Fig. 5. Transversal section through the peduncle of a tentacle. 



