80 CLASS I.— ORDER II. 



DISTANT. 



10. Dynamena distans. Cells very distant from 

 each other, with border entire ; colour whitish, and 

 a little transparent ; height about one centimetre. — 

 Plate 5. fig. 1. a. B. 



On the fucus natans and other marine productions 

 of the Atlantic. 



TURBINATED. 



11. Dynamena turbinata. Root rampant; stem 

 simple, and upright ; cells rather long, with a wide 

 open mouth, and border entire ; colour, a yellow fawn ; 

 height about one centimetre. 



On the Australasian fucus. 



DIVERGENT. 



12. Dynamena dhergens. Stem flexuous ; branches 

 diverging, and alternate, almost at right angles with 

 the stem ; cells with a toothed border ; colour, yellow 

 fawn; height a centimetre. — Plate 5. fig. 2. a. B. 



On the fucus of Australasia. 



BIFORM. 



13. Dynamena distkha. Stem simple, upright, 

 and articulated ; cells scarcely visible, almost trian- 

 gular, with the extremity curved. 



On the fucus natans. 



r 



MARINE. 



14. Dynamena pelagica. Stem composite, and 

 flexuous ; branches alternate ; cells tubular, with an 

 horizontal border. 



On the fucus natans. 



