178 THE FRESH-WATER ALGAE OF ESSEX. CHROOLEPIDAE. Chroolepus aureus, Linn. Cooke, t. 72, f. 1. On trunks, Epping Forest. CHAETOPHORACEAE. Stigeoclonium thermale, Br. Cooke, t. 73, f. 2. In springs, etc., Easthorpe (E.G.V.); Snaresbrook. S. nanum, Dill. Cooke, t. 74, f. 2, In streams, Braxted (E.G.V.). Draparnaldia glomerata, Ag. Cooke, t. 75, f. 1. In pools, Kelvedon (E.G.V.); Loughton. D. plumosa, Vauch. Cooke, t. 76, f. 1. In pools, Kelvedon (E.G.V.) ; Snaresbrook. Chaetophora pisiformis, Roth. Cooke, t. 77, f. 1. On submerged plants, Easthorpe (E.G.V ); Walthamstow. C. tuberculosa, Roth. Cooke, t. 78, f. 1. In pools, Riven- hall; Coggeshall; Kelvedon (E.G.V.). C. elegans, Roth. Cooke, t. 77, f. 2. On submerged plants, Feering ; Kelvedon (E.G.V.); Snaresbrook. C. endivaefolia, Ag. Cooke, t. 78, f. 2. In ditches. Riven- hall; Kelvedon (E.G.V.). Colaeochaete scutata, Breb. Cooke, t. 79. On Hypnum, Kelvedon (E.G.V.). The species of Chytridieae have latterly been removed from the Algae, and placed in closer relation to the Fungi. CHROOCOCCACEAE. Aphanothece prasina, Br. Cooke, t. 5, f. 4. In ditches, bogs, etc., Kelvedon (E.G.V.). This seems to be the same as Palmella mooreana. NOSTOCHINEAE. Nostoc commune, Vauch, Cooke, t. 91, f. 4. On the ground, Kelvedon (E.G.V.). Anabaena hassallii, Nord. Cooke, t. 93, f. 3. In ditches, Kelvedon (E.G.V.). Cylindrospermum macrospermum, Kutz. Cooke, t. 95, f 1. In ditches, Kelvedon ; Yeldham (E.G.V.). LYNGBYAE. Spirulina jenneri, Kutz. Cooke, t. 96, f, 1. In stagnant water, Kelvedon ; Easthorpe (E.G.V.)