THE FRESH-WATl'.R XhC.V. OF ESSEX. I 73 



Penium margaritaceum, Breb. Cooke, Dcsm., t. 17, f. i. 

 In pools, Chingford. 



P. digitus, Brel). Cooke, Desm., t. 16, f. i. In pools, 

 Loughton ; Walthamstow. 



P. closteroides, Ralfs. Cooke, Desm., t. 16, f. 3. In ponds, 

 Chingford (Q.AL.C). 



P. brebissonii, Ralfs. Cooke, Desm., t. 17, f. 3. In pools, 

 High Beach (A.H.H.); Wood Street, Walthamstow ((^.M.C). 



Mesotaenium braunii, I). By. In pools, Kelvedon (E.Ci.V.). 



Tetmemorus brebissonii, Ralfs. Cooke, Desm., t. iS, f. 7. 

 In pools. High Beach (A.H.H.) ; Snaresbrook. 



T. granulatus, Ralfs. Cooke, Desm., t. 18, f. S. In pools. 

 High Beach (A.H.H. ). 



Spirotsenia condensata, Breb. Cooke, Desm., t. ig. f. 3. 

 ' In boggy pools. Wood Street, Walthamstow (Q.M.C.); High 

 Beach. 



Micrasterias denticulata," Breb. Cooke, Desm., t. 22. In 

 i 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. i. In pools, 

 High Beach (A.H.H.). 



E. affine, Ralfs. Cooke, Desm., t. ;^^, f. 2. In pools, High 

 Beach (A.H.H.). 



E. ansatum, Ehr. Cooke, Desm., t. t,;^, 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 ; \\'althamstow. 



C. brebissonii. Men. Cooke, Desm., t. 38, f. 2. In pools, 

 Loughton (Q.M.C.). 



