SCHIZOPHYTA— DR DICKIE. 401 



2. N. verrucosum, Vauch. Conf. 225, t. 16, f. 3; Ktz. Sp. Alg. 300, 

 and Tab. Phyc. ii. 3, t. 9, f. 2; Rabenh. Alg. Europ. iii. 176. 



Socotra. 



Distrib. Cosmopolitan. 



2. RIVULARIEtE. 



SCHIZOSIPHON. 



Schizosiphon, Ktz. Phyc. Gen. 233, and Sp. Alg. 327, and Tab. Phyc. ii.; Eabenh. Alg. Europ. 

 ii. 232, f. 55. 



A considerable genus of marine and fresh water forms distributed in both 

 old and new worlds. 



S. aponinus, Menegh. in Ktz. Sp. Alg. 328, and Tab. Phyc. ii. 15, t. 49, 

 f. 3; Rabenh. Alg. Europ. ii. 235. 



Socotra. 

 Distrib. Italy. 



3. OSCILLARIE^E. 



1. LYNGBYA. 



Lynglya, Ag. Syst. Alg. xxv. and 73; Ktz. Sp. Alg. 279, and Tab. Phyc. i.; Eabenb. Alg. 

 Europ. ii. 135, f. 27. 



A vast genus of all parts of the world in both fresh and salt waters. 



1. L. obscura, Ktz. Phyc. Gen. 224, t. 5, f. 1, and Sp. Alg. and Tab. 

 Phyc. i. 48, t. 88, f. 2; Rabenh. Alg. Europ. ii. 136, f. 27, 2. 



Socotra. 



Distrib. Generally in Europe. 



2. L. CUrvata, Rabenh. Alg. Europ. ii. 137. 



Siphodcrma ewrvatwm, Ktz. Phyc. Gen. 220, and Sp. Alg. 274, and Tab. Phyc. i. 45, t. 78, I 2. 



Socotra. 



Distrib. Italy, North Germany. 



3. L. majuscula, Harv. in Hook. Brit. Flor. ii. (1833), 370, and Phyc. 

 Brit. t. 62; Ktz. Tab. Phyc. i. 49, t. 90, f. 1. 



Socotra. 



Distrib. Cosmopolitan. 



TRANS. ROY. S0C. EDIN. VOL. XXXI. 3 E 



