16 COLLINS AND HERVEY. 



clefts of rocks, rock pools, roadsides, within reach of salt water or far 

 from it. As noted by Bornet, 1892, p. 175, it varies much in the 

 appearance of the stratum, from thick gelatinous masses to thin 

 films, also in the development of the concentric walls; in a rock pool 

 of fresh water, near the Old Ferry road, we collected a form quite 

 without these walls, closely resembling Aphanothece microscopica, 

 P. B.-A., No. 552; but it seems probable that it is merely a state of 

 the present species corresponding to Bornet's section I, in which he 

 includes Microcystis microspora Menegh. This form distributed as 

 P. B.-A., No. 2154. Lyngbye's specific name, used by Bornet in 

 1880, is the oldest, and must supersede the name used by Bornet in 

 1892. 



ENTOPHYSALIS Kiitzing. 



E. GRANULOSA Kutzing, 1843, p. 177, PI. XVIII, fig. 5; Bornet & 

 Thuret, 1876, PL I, figs. 4 & 5. On rocks, North Shore, Aug., Collins. 



MICROCYSTIS Kutzing. 



*M. MARGINATA (Menegh.) Kutzing, 1845-49, p. 6, PI. VIII; 



Anacystis marginata Meneghini, 1836, p. 6; 1842, p. 93, PI. XIII, 



fig. 1. With other algae on wall of cave near Causeway, April, 

 Collins. 



MERISMOPEDIUM Meyen. 



1. Families 50-150 /* square. 1. M. glaucum. 



1. Families 1-4 mm. square. 2. M. convolutum. 



*1. M. GLAUCUM (Ehrb.) Nageli, 1849, p. 55, PI. I. D, fig. 1; 

 Gonium glaucum Ehrenberg, 1838, p. 56, PL III, fig. 5. Among other 

 algae in pool by race course, Aug., Collins. 



*2. M. CONVOLUTUM Brebisson in Kutzing, 1849, p. 472; 1855, 

 p. 13, PL XXXVIII, fig. IX. Among various algae in Harrington 

 Sound; in cave at Gravelly Bay, Jan., Hervey. 



ONCOBYRSA Agardh. 



O. MARINA (Grun.) Rabenhorst, 1865, p. 68; Hydrococcus marinus 

 Grunow, 1861, p. 420. On Dictyopteris Justii, Gravelly Bay, Aug., 

 Collins; on Sphacelaria, Spanish Rock, March, Hervey. 



