PLATE XI. 



FiQ. 5. 



Fig. 1. Diagram of Cephalopod. Fig. 5. Rotifer. Hydatina Senta. 



Fig. 2. Brachiopod. Rhyncho7ieUa Fig. 6. Turbellarian. Dendroccelum 



Psittacea. Nausicaa. 



Fig. 3. Diagram of Ascidian. , Fig. 7. Gregarine. Stylo rhynclms Oli- 

 Fig. 4. Diagram of Polyzoon. gacanthus. 



