30 COLLINS AND HERVET. 



*4. C. BOTETTis Meneghini ex Ralfs, 1848, p. 99, PL XVI, fig. 1; 

 WoUe, 1884, p. 74, PL XIII, fig. 5; G. S. West, 1911, p. 1, PL XC^I, 

 figs. 1, 2, 5-15; P. B.-A., No. 2062. In artificial reservoir for fresh 

 water near Spanish Rock, Dec, Hervey. 



Mesotaenium Nageli. 



*M. Endlicherianum NageU, 1849, p. 109, PL VI. B; G. S. West, 

 1904, p. 56, PL IV, figs. 20-21; P. B.-A., No. 1857. Among other 

 algae in a ditch, fresh water or nearly so, Devonshire Marsh, April, 

 Collins. 



Family ZYGNEMACEAE. 

 Spieogtra Link. 



S. submaeina (Collins) Transeau, 1915, p. 25; S. dedmina var. 

 submarina CoUins, 1909, p. 110; 1912, p. 72. Ditch in South Shore 

 marshes, Sept., Colhns. This was first described as a variety of 

 iS. dedmina, which it considerably resembles, and it was known from 

 three widely separated stations in New England. The Bermuda 

 material emphasizes the differences from S. dedmina; the long cells, 

 up to 8 diam., and the considerably swollen fertile cells; the material 

 from the Elizabeth Islands, Collins, 1912, p. 72, has cells as small as 

 21 n diam. 



Family VOLVOCACEAE. 



A Chlamydomonas was found in abundance in the water of an old 

 tank, near Trott's Pond, Aug., Collins, but we have not been able to 

 determine the species. 



Family TETRASPORACEAE. 

 Tetraspora Link. 



*T. LUBEiCA (Roth) Agardh, 1824, p. 188; ColHns, 1909, p. 139, 

 fig. 26; 1 Uha Ivhrica Roth, 1806, p. 168. On dead leaves in ditch in 

 Devonshire Marsh, Dec, CoUins. 



