THE MARINE ALGM OF NEW ENGLAND. 29 



p. 157, PL VI, Figs. 1-10. (Nicrolialoa rosea, Kiitz., in Linnea, VIII, 

 341. — Protococciis, Kiitz., Spec. Alg. — Pleurococcus roseo-jpersicinus, Bab., 

 Flora Europ. Alg. — Cryptococcus roseus, Kiitz., Phyc. Gen.; Le Jolis, 

 Liste des Algues Marines; Crouan, Florule du Finistere; Farlow, List 

 of Marine Algae, 1876. — Bacterium rubescens, Lancaster, in Quart. Journ. 

 Micros. Science, Vol. XII, new series, p. 408, PI. 22 and 23.) 



Cells very small, about .0025 mm in diameter, rose-colored. 



Whole New England coast ; Europe. Both marine and in fresh water. 



Very common on decaying algae and on the mud, which it covers with a purplish-red 

 film. It is also found on codfish in the Gloucester market, causing what is known as 

 the red fish. This alga, of which the detailed history is -given by Cohn and Lankas- 

 ter, 1. c, after having been placed by different writers in several different genera, has 

 finally been associated with Clathrocystis aeruginosa, Henfrey, a common fresh-water 

 alga of Europe and the United States. Both species are at first minute and solid, but 

 as they grow older become hollow, and at length portions become detached, leaving 

 holes in the circumference. Although in Europe the species is found in fresh water as 

 well as in salt, it has not yet been observed in the interior of this country. 



ENTOPHYSALIS, Kiitz. 



(From evrog and <f>vaa2.ig, a bladder.) 



Cells united in colonies, which assume a dendritic form. 



The genus is founded on EntopTiysalis granulosa, a species of the Mediterranean, re- 

 ferred by Zanardini to the Palmellacew, but more correctly by Thuret and Bornet to 

 the Chroococcacece. 



E. MAGNOLL3B, n. 8p. 



Cells dark purple, .004-6 "^ in diameter, united in twos and fours and 

 imbedded in jelly, which forms a densely branching mass. 

 Magnolia Cove, Gloucester, Mass. Bare. Autumn. 



This alga forms a thin slime on exposed rocks, in company with Glceocapsa crepidi- 

 num. The ramifications of the frond are visible on careful dissection. The species is 

 much smaller and differs in color from E. granulosa of Europe. The cells do not differ 

 much in size from those of the Glceocapsa, but they are of an entirely different color 

 and have the concentric arrangement of the cell- wall much better marked than in 

 that species. The cells adhere together in twos, fours, or some multiple of four, and 

 all are held together by a mucous mass, which branches in a very dense fashion. The 

 genus EntopTiysalis is merely a Glceocapsa, which instead of being indefinitely expanded 

 is densely ramified. 



Suboedee NOSTOCHINEJ3. 



(Nematogencs, Cohn in part.) 



We have followed Thuret's Essai de Classification des NostochinSes, 

 Ann. des Sciences, 6 sCrie, Tome I, in the arrangement of the genera. 



1. Filaments terminating in a hyaline hair 7 



Filaments destitute of a terminal hair 2 



