Gr. Y. and A. F. Dixon — On Bunodes thallia, etc. 



325 



DESCRIPTION OF PLATES IV. and V. 



Plate IV. 



Fig. 1. — Part of a transverse section of a tentacle of Bunodes thallia, 

 showing the fluted appearance assumed in semi-contraction. 



Fig. 2. — Transverse section of a specimen of B. thallia, which possessed 

 three oesophageal grooves. The section was taken in about 

 the middle of the oesophageal region. 



Fig. 3. — Portion of transverse section of the same specimen, taken 

 lower down, and corresponding to the part between the 

 directive mesenteries marked * in Fig. 2. This section 

 shows the manner in which two of the grooves become 

 confluent towards the base of the oesophagus, and the 

 arrangement of the mesenteries enclosed by the corre- 

 sponding directives. 



Fig. 4. — Vertical section of body wall of B. thallia, made through the 

 middle of an endoccele, showing the warts (" endodermal 

 saccules"). 



