502 T. A. STEPHENSON 
TEXT-FIG.. 2. 
A. Vertical section of a whole specimen of Phyllodiscus, to show 
two vesicles (v) and two tentacles (t) cut through. Mesenteries, 
&ec., are omitted for clearness. 3B. Vertical section of a portion 
of the upper part of the body-wall and outer part of the oral dise 
of Cryptodendron. The section passes through many short 
tentacles (¢),and although all do not belong to the same mesenterial 
chamber (mesenteries are omitted for clearness), there is not by any 
means only one tentacle to each chamber as at A. 8, sphincter ; 
b, body-wall. 
