THE FRESH-WATER ALGAE OF ESSEX.
173
Penium margaritaceum, Breb. Cooke, Desm., t. 17, f. 1.
In pools, Chingford,
P. digitus, Breb. Cooke, Desm., t. 16, f. 1. In pools,
Loughton ; Walthamstow.
P. closteroides, Ralfs. Cooke, Desm., t. 16, f. 3. In ponds,
Chingford (Q.M.C.).
P. brebissonii, Ralfs. Cooke, Desm., t. 17, f. 3. In pools,
High Beach (A.H.H.); Wood Street, Walthamstow (Q.M.C.).
Mesotaenium braunii, D. By. In pools, Kelvedon (E.G.V.).
Tetmemorus brebissonii, Ralfs. Cooke, Desm., t. 18, f. 7.
In pools, High Beach (A.H.H.); Snaresbrook.
T. granulatus, Ralfs. Cooke, Desm., t. 18, f. 8. In pools,
High Beach (A.H.H.).
Spirotaenia condensata, Breb. Cooke, Desm., t. 19. f. 3.
In boggy pools, Wood Street, Walthamstow (Q.M.C.); High
Beach.
Micrasterias denticulata, Breb. Cooke, Desm., t. 22. In
bog pools, Epping Forest.
M. rotata, Grev. Cooke, Desm., t. 24. In pools, Chingford
(Q.M.C.); Snaresbrook.
Euastrum oblongum, Grev. Cooke, Desm., t. 31, f. 2. In
pools, High Beach (A.H.H.).
E. crassum, Kutz. Cooke, Desm., t. 32, f. 1. In pools,
High Beach (A.H.H.).
E. affine, Ralfs. Cooke, Desm., t. 33, f. 2. In pools, High
Beach (A.H.H.).
E. ansatum, Ehr. Cooke, Desm., t. 33, f. 5. In ponds,
Loughton ; Snaresbrook.
E. circulare, Hass. Cooke, Desm., t. 34, f. 2. In pools,
High Beach (A.H.H.).
E. elegans, Breb. Cooke, Desm., t. 35, f. 5. In pools,
Snaresbrook.
E. inerme, Lund. Cooke, Desm., t. 35, f. 4. In pools,
Snaresbrook.
Cosmarium cucumis, Corda. Cooke, Desm., t. 36, f. 11.
In pools, High Beach.
C. meneghinii, Breb. Cooke, Desm., t. 37, f. n. In pools,
Loughton Side ; Walthamstow.
C. brebissonii, Men. Cooke, Desm., t. 38, f. 2. In pools,
Loughton (Q.M.C.).