THE MARINE ALG.I-: OF ESSEX. 



certain to occur there, and I have seen specimens from the adjacent 

 county of Suffolk, but without the exact locahty being given. 



ISACTIS, Thur. 

 Isactis plana, Thur., " Essai de Classif. Nost.," p. ii. "On 

 old oyster shells in the Blackwater Estuary," E. M. Holmes, Essex 

 Naturalist, vol. ii., p. 2^9. 



RIVULARIA, Ag. 

 Rivularia atra, Roth.. "Car. Bot.," iii., p. 340. On rocks 

 near high-water mark. Felixstowe, June, 1885, E. A. B, Rare. 



Sirosiphoniacese, Rabenh. 

 MASTIGOCOLEUS, Lagerh. 

 Mastigocoleus testarum, Lag., " Notarisia," 1886, i., p. 65, 

 tab. I. In old oyster shells from the Blackwater, near Maldon. 

 E. A. B. 



Nostoceae, Kiitz. 



ANAB.*:NA, Bory. 



Anabsena variabilis, Kiitz, " Phyc. General," p. 210. On 



the muddy shores of the Stour, near Harwich, June, 1885, E.A. B. 



The specimens of this species distributed in Mr. Holmes's valuable 



" Alga3 Britannicje Rariores Exsiccat^e '' are from the above locality. 



CHLOKOSPERME.^, Harv. 



Protococcacese, Menegh. 

 CHl.OROCHYTRIUM, Cohn. 

 Chlorochytrium inclusum, Kjellm., " N. I. Algfl.," p. 392, 

 tab. 31, figs. 8-17. Parasitic in the fronds of Dilsea edidis. Har- 

 wich, Jan., 1883, G. P. H. I detected a few fronds of this curious 

 parasite in the fronds of some specimens of Dilsea cdulis collected 

 by Mr. Hope at Harwich. 



Ulvaceae (Ag.), Rke. 

 MONOSTROMA, Thur. 

 Monostroma laceratum, Thur., "Note sur Syn. Ulv.," p. 32. 

 Brackish pools, near Maldon ; E. A. B. 



ENTEROMORPHA, Link. 

 Enteromorpha ramulosa, Hook, " Brit. Flor,," ii., p. 315. ^ 



