ALG^E — DR DICKIE. 399 



4. S. dubia, Ktz. Sp. Alg. 441 ; Tab. Phyc. v. 8, t. 24, f. 4 ; Eabenh. Alg. 

 Europ. ii. 243, 



var. longiarticulata, Ktz. Tab. Phyc. v. 8, t. 25, f. 1. 



Socotra. 



Distrib. Many parts of Europe. 



2. ZYGNEMA. 



Zygnema, Ag. Syst. Alg. 77 ; Ktz. Phyc. Gen. 280, and Sp. Alg. 444, and Tab'. Phyc. v. ; 

 Kabenh. Alg. Europ. iii. 249, f. 74. 



A considerable genus represented in all parts of the world. 



Z. Vaucherii, Ag. Syst. Alg. 77 ; Ktz. Phyc. Gen. 280, and Sp. Alg. 445, 

 and Tab. Phyc. v. 5, t. 16, f. 4 ; Rabenh. Alg. Europ. iii. 250, 



var. tenue, Eabenh. Alg. Europ. ii. 250. 

 Z. tenue, Ktz. Sp. Alg. 446, and Tab. Phyc. v. 5, t. 16, f. 3. 



Socotra. 



Distrib. Of the species — Europe in many places. Of the variety — Europe, 

 Bolivia. 



2. CONFERVOIDEiE. 



CH^TOMORPHA. 



Ohcetomorpha, Ktz. Phyc. Germ. 203, and Sp. Alg. 375, and Tab. Phyc. hi.; Eabenh. Alg. Europ. 

 ii. 327, f. 293. 



A large genus of marine and brackish water, species found all over the 

 world. 



1. C. tortuosa, Ktz. Sp. Alg. 376, and Tab. Phyc. iii. 17, t. 50, f. 2. 



Conferva tortuosa, Dillwyn. Conf. 46; Eng. Bot. t. 2220. 



Socotra. 



Distrib. Mediterranean and Adriatic, Atlantic shores of Europe, United 

 States, Juan Fernandez, Barbadoes. 



2. C. chlorotica, Ktz. Sp. Alg. 377; Tab. Phyc. iii. 18, t. 54, f. 2. 



Socotra. 



Distrib. Mediterranean and Adriatic. 



