Plate XIII. 



Alaria naïut. Schradeiî. 



Fiji-. 1. A ])l;iiit in natural size, with tlie u])peT part of the blade cut off. 

 The specimen here shoAxii is a complete torm foiuid in a rather 

 (|uiet water. The species is habitually found on a surfing reef 

 A\ith the blade roughly torn away, and the holdfast is nmch 

 less ramified than shown in tlie figur(^. 



Fig. 2. Cross section of the midrib of a pl;iut al)out '22 cm. in total height- 

 The spanning cortex, not yet differentiated, x 5. 



Fig. 8. Cross section of the midrib of a matured plant, x 5. 



