128 The Ohio Journal of Science [Vol. XVIII, No. 4, 



Burkillia is known only from Burma. The remaining two 

 genera, Coslastrum and Sorastrum are abundant and have a 

 wide distribution. The genus Hariotina based by Dangeard 

 (1889) on H. reticidatum is now included with Ccelastrum while 

 Selenosphcerium of Cohn (1879) is placed with Sorastrum. 



TABLE OF GENERA. 



A^ Cells comparatively smooth or at least not developing acute processes 

 or spike-like appendages; colonies with cells regularly arranged, 

 usually approximating the form of a sphere, which may be extremely 

 flattened. 

 B' Colonies formed of 16 cells; form not that of a true sphere. 



C^ Cells arranged in groups of fours, the groups not con- 

 tiguous; colony not flattened 1. Gen. Eutetramorus 



C^ Cells not arranged in groups of fours; contiguous; colony 



flattened 2. Gen. Phytomorula 



B^ Colonies formed of 2-32 cells; form approximately spherical. 



3. Gen. Coelastrum 

 A'^ Cells developing acute processes or provided with acute or spike-like 



appendage processes; colonies with cells not regularly arranged, not 

 approximating the form of a sphere. 

 B^ Cell walls gradually narrowed into an acute process. 



4. Gen. Burkillia 

 B^ Cells provided with spike-like appendages or elongate processes. 



5. Gen. Sorastrum 



BIBLIOGRAPHY. 



1915. Brunnthaler, J. Die vSiisswasser-Flora Deutschland, Oesterreichs, und der 



Schweitz, Hft. 5. p. 1913, (G. Fischer, Jena.) 

 1914. Kofoid, C. A. Phytomorula regularis, A Symmetrical Protophyte related 



to Coelastrum. Univ. of Calif. Pub., Botany, V. 6, No. 2, p. 35-40, PI 7. 

 1907. West, W. and West, G. S. Fresh-water Algae from Burma, including a few 



from Bengal and Madras. Ann Roy. Bot. Gard. Calcutta, V. 6, Pt. 2. 



1916. West G. S. Algae, p. 205 and 243 (Cambridge University Press, Cam- 



bridge, England. 



Kenyon College, Gambler, Ohio, December 5, 1917. 



