Ill i LENS kND m i;\ El , 



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

 from it. As Doted by Bornet, L892, p. L75, 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 microtcopica, 

 I\ B.-A., No. 552; but it seems probable that it is merely a stafc 

 the present specie- 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 Hornet in 

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



Entophysalis Kutzing. 



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

 Thuret. 1876, PI. I. figs. 1 & 5. On rocks. North Shore, Aug., ( ollins. 



Microcystis KiitzL 



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



Ancwystis marginata Meneghini, 1836, p. (>; 1X42, p. ( X\, PI. XIII, 



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



Collins. 



Merismopediuh Meyen. 



1. Families 50-150 m square. 1. M. glauoum. 



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



*1. M. OLAUcmi (Ehrb.) Nagdi, 1849, p. ^, PI. I. D, fig. 1; 



(ionium glaucum Ehrenberg, 1838, p. 56, PI. Ill, fig. 5. Among other 

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



*2. M. CONVOLUTUM Prebisson in Kutzing, L849, p. 172; 1855, 

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

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



()\< om BSA Agardh. 



0. marina (Grun.) Rabenhorst, 1865, p. 68; Hydrococctu marinut 

 Grunow, 1861, p. 420. On Dictyopteria Justii, Gravelly Pay, Aug., 

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



