THE MARINE ALG^E OF NEW ENGLAND. 29 



p. 157, n. Vr, Fi«j:s. 1-10. {MicrohaJoa rosea, Kiitz., in Linnea, VIII, 

 341. — Proi^coccus, Kiitz., Spec. Al;;. — rieuroc<Kcu.s nhseopcrsicinus, Kab., 

 riora Eiirop. Al^. — Cri/ptococcus roseus, Kiitz., Pliyc. Gen.; Le Jolis, 

 Liste lies Al«^ues Marines; Cronan, Flornle du Finistere; Fallow, List 

 of Marine Alga», 187(5. — Bacterium rubescenSj Lankaster, in Quart. Journ. 

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



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



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



Vrry common on dt'oayinf; ali;:p ami on the mn<l, wliich it corors witli a puq»lish-red 

 lilm. It is also found on codlish in tho Gloucester market, causing what is known as 

 the red tisb. This al<;a, of which the detailed history is given hy Cohn and Lankas- 

 ter, 1. c, after ha\ inj^ been placed by ditiereut writers in several diti"er«*nt genera, has 

 finally been a^wociated with Clathrocyntia (cruginosa, llenfrey, a common fresli-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. 



EXTOPHYSxVLIS, Kiitz. 

 (From evToc and <l>vaa?uc, a bladder.) 



Cells united in colonies, which assume a dendritic form. 



rhe genus is founded on Entophysalia granulosa, a species of tho Mediterranean, re- 

 ferred by Zanardiui to the ralmellacecB, but more correctly by Thuret and Bornet to 

 the Chroococcacca:. 



E. Magnolia, n. sp. 



Cells dark purple, .OOl-G"*™ in diameter, united in twos and fours and 

 imbedded in jelly, which forms a densely branching mass. 

 Magnolia Cove, Gloucester, Mass. Kare. Autumn. 



This alga forms a thin slime on exposed rocks, in company with Glwocapsa crejyidi- 

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

 much smaller and difi'ers in color from E. granulosa of Europe. Tho cells do not difler 

 much in size from those of the Gla:ocap8a, but they are of an entirely diflerent color 

 and have the concentric arrangement of tho 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. Tho 

 genus Entophynalis is merely a Glccocapsa, which instead of being indefinitely expanded 

 '- densely ramified. 



Suborder NOSTOCIIINE^. 



{yemaiogenoB, Cohn in jtart.) 



We have followed Thuret's Essai dc Classification des yostochin^eSj 

 Ann. des Sciences, G serie, Tome I, in the arrangement of the genera. 



1. Filaments terminating in a hyaline hair 7 



Filaments destitute of a terminal hair 2 



