NO. 2 drouet: myxophyceae 27 



Spirulina tenerrima Kiitzing ex Gomont, Ann. Sci. nat. VII, Bot., 

 16: 252. 1892. 



Forma trichomatibus haud 0.4/a crassis, spiris 1.4/i,ad 1.5/i crassis, 

 anfractibus regulariter \\x. distantibus. Fig. i^. 



ECUADOR: Galapagos Islands, abundant in bottom muck of 

 an in inland salt pool, north end of Isabela Id., near Albemarle 

 Point, No. 12 J, January 12. 



The exact taxonomic relationship between this species and S. 

 socialis Gardner (N. Y. Acad. Sci., Sci. Surv. Porto Rico 8(2): 272. 

 1932) and between S. socialis and S. subtilissima Kiitzing (Phyco- 

 logia generalis, p. 183. 1843) has not been too clearly defined. 



