are simple, cylindrical, ^-f inch long, blunt, and smooth, formed in the 

 ends of the ultimate, or occasionally of all the ramuli. The colour is a full 

 dark-olive, becoming black when dry. The substance is coriaceous and ra- 

 ther flaccid; 



This is one of the smaller and more slender species of Cysto- 

 phora, and not likely to be confounded with any other. It is 

 most allied to C. uvifera, with which it agrees in the usual posi- 

 tion of the air-vessels, which in these two species arise from the 

 main branch or rachis of the frond, but from which it differs in 

 the shape of the air-vessels. In C. cephalornitJios the vesicle is 

 shaped, as the name signifies, something like a bird's head (Eig. 

 2), and in C. uvifera it is globose, like a grape. 



Our figure necessarily represents one of the smaller and 

 younger fronds. Old specimens, from deep water, become again 

 decompound, the ramuli shooting out into secondary rachides, 

 and being closely pinnated and vesiculiferous, and in all respects 

 repetitions of the primary frond. 



This species is not uncommon on the coast of Victoria. My 

 largest specimens were gathered at Port Fairy. 



Fig. 1. Cystophora cephalornithos, — the natural size. 2. A vesicle. 3. 

 Ramuli bearing receptacles : — the latter figures enlarged. 



