PLATE 16. 



Physophora hydrostatica. 



Fig. 1. General view of young colony with only two pairs of developed nectophores. X 5. 



Fig. 2. Siphon (S) and tentacle (T) with its tentilla (Te). X 9. 



Fig. 3. Siphosome, and part of neetosome of older colony. Some of the palpons (P) and siphons 

 (S) are removed to expose the gonophores (Go). X 4. 



Fig. 4. Siphosome of another large colony. Several of the younger palpons (P) have been removed 

 to show their scars of attachment to youngest cormidia (Co-) and the spiral arrangement of the latter. 

 X5. 



Fig. .5. Another colony, with most of the palpons removed, so as to show the gonodendra (Go). 

 X5. 



Fig. 6. Apical view of dilated siphosome, same specimen as fig. 4, showing the succession of 

 palpons of different ages. The oldest one (P') is still attached. X 5. 



Fig. 7. A nectophore. Ventral view. X 7. 



Fig. 8. Nectophore, lateral view. X 7. 



Fig. 9. Male and female gonodendra (Go. cf, Go. 9). X 10. 



All figures from photographs. 



