58 The Botanical Gazette. [February, 
gether. When the cells fit closely together the projecting 
teeth interlock. It would be difficult to imagine a more rigid 
connection than this. The firmness of the union and the 
shape of the cells give the filaments little flexibility, and they 
are usually nearly straight. 
Unfortunately it was impossible to work out the develop- 
ment of the terminal lobe, as no specimens were found under- 
going division. ; 
small size. he average diameter of thirty specimen 
*°Phycologia Germanica 134. 1845. 
1 pBulletin of Torrey Botanical Club. 6: 122.8: p/. 6. f. 5. 1881. 
1*Flora 10: 643. 1827, 4 
18Sylloge Algarum omnium hucusque cognitarum, 1: 1114. 1839. 
