SPIROT7ENIA. 43 



8. Spirotaenia fusiformis West & G. S. West. 

 (PI. II, figs. 12-14.) 



Spirotsenia fusiformis West & G. S. West, Notes Alg. I, 1898, p. 2 (sep.) ; 

 Alga-fl. Yorks. 1900, p. 40. 



Cells small, 10-12 times longer than their diameter, 

 elongate, straight or often slightly oblique, cylindrico- 

 fusiform, attenuated towards the apices which are 

 acute but rounded ; chloroplast parietal, rather broad 

 and somewhat irregularly disposed from pole to pole, 

 making -| -- f of a revolution. 



Zy go spore unknown. 



Length 42-58 n ; breadth 4' 3-4' 6 n. 



ENGLAND. --Cowgill Wold Moss, Widdale Fell, W. 

 Yorkshire ! 



This species was found in peaty pools amongst Sphagnum. 

 The cells were solitary or in pairs (after division) and occurred 

 somewhat sparingly among a large quantity of Artlirodcsnius 

 Incus. It was very difficult to determine the precise nature of 

 the chloroplast, on account of its iiideriniteness and the small 

 size of the plant ; it only made from half to three-quarters of 

 a turn, and the protoplasm (outside the chloroplast) contained 

 some large granules. 



It is distinguished from S. teuerrima Arch, by its greater 

 diameter, its comparatively shorter cells, and by the different 

 nature of the chloroplast. 



9. Spirotsenia parvula Arch. 

 (PI. II, figs. 15-18.) 



Spirotsenia parvula Arch. Descript. new Cosm. etc. p. 84, t. 2, f . 32-43 ; 

 Kabenh. Flor. Europ. Algar. Ill, 1868, p. 147; Lund. Desm. Sviec. 

 1871, p. 91 ; Cooke, Brit. Desm. 1886, p. 51, t. 19, f. 5; Liitkem. Desm. 

 Attersees, 1893, p. 540; Liitkem. Gatt. Spirotaen. 1895, p. 54; Nordst. 

 Index Desm. 1896, p. 196. 



Cells minute, 5-8 times longer than their diameter, 

 slender, fusiform, apices gently rounded; chloroplast 

 parietal, very narrow, making 1-1J revolutions. 



Zygospore unknown. 



Length 17-35 /u ; breadth 3'5-4'5 /u. 



