410 BOTANY OF SOCOTRA. 



Family 2. COSCINODISCE-E. 



CYCLOTELLA. 



Gyclotella, Kutz., 1833. 



O. Meneghiniana, Kiitz. 



var. rectangulata, Brebisson, Van Heurck Synops. p. 214, pi. xciv. fig. 17 ; 

 Kitton in Journ. Linn. Soc. xx. 515. 



Socotra. Rare. 



Distkib. England, France, Europe, America, Asia, found in fresh and 

 brackish water. 



