-192 THE AUSTRALIAN HYDROMEDUS.'E. 



Plate XV. 

 Aglaophexia. Kirchenpaueri. 

 Fig. 20. — The colony in natural size. 

 Fig. 21. — A Gonophor from below. A., Oc. III. 

 Fig. 22. — Section through a branch of the skeleton along the Symmetry - 



plane. C, Oc. I. 

 Fig. 23. — Horizontal projection of the same. 



Plate XVI. 



Fig. 24. — Pentaudra parvula. Section through the skeleton of a branch 



along the Symmetry-plane. C, Oc. I. 

 Fig. 25. — Horizontal projection of the same. 



Fig. 26. — Pentandra Balei. Section through the skeleton of a branch 

 along the Symmetry- plane. O, Oc. I. 



Fig. 27. — Horizontal projection of the same. 



Plate XVII. 



Fig. 28.— Plumularia gracilis. Section through the skeleton of a branch 



along the Symmetry-plane. DD., Oc. I. 

 Fig. 29. — Horizontal projection of the same. 

 Fig. 30.— Dicoryne annulata, the living Hydrokl. C, Oc. I. 



