ALG OF THE BIRKET QARUN, EGYPT 241 
the swampy pools of the littoral region, and also in the plankton. 
It was present in almost all ce Dr. Cu ng s collections. 
17. M. varians Ag. In wampy ponds (no 
18. M. granulata (Hhrenb.) Ret. In swampy ponds (no. 389). 
On stones in shallow water (no. 4 
; Stephanie Astrea (Ehrenb.) Grun. In swampy ponds 
(no. 
20. Diatoma elongatum Ag. On stones in shallow water 
(no. 430). 
21. Fragilaria sp. Valve view lanceolate with obtuse poles ; 
strie short and coarse, 7 in 10 #. Length of valve 17-22 p, 
breadth 5». In swampy ponds (no. 389). 
22. Synedra radians (Kiitz.) Grun. In shallow. water 
no. 430 
23. “Go cconeis Hehases Ehrenb. Attached to the bottom of 
boat as 421) ; also on stones in shallow water (no. 430). 
4, Navicula gracilis Kiitz. In algal matrix attached to bottom 
of on (no. oh and in shallow Mar (nos. 430 and 454 
- N. producta W. Sm. In swampy pent Re 389), and in 
an aga scum on surface of stauiiant pool (no 
26. N. avenacea Bréb.; Cleve Synops. Nevis Diatoms, ii. 
1895, p. 15. [Schizonema "Smithii (Ag.) V. H.] On stones in 
shallow water (no. 430), and also on mud in a drying-up vats 
lagoon (no. 439). The colonies a this diatom in some case 
formed a dense yellow- mes stratu 
yro se spine um (W. Sm, ). On stones 2 shallow 
water (nos. 430 a 448): sala 3 in ee pool (no. 4 
28. pp hte paludos a W.Sm. In great aad on the 
mud of a rien -up salt- Haga (no. 439 
29. Mastogloia exigua Lewis. On stones in shallow water 
no. 4 
30. Gomphonema parvula Kitz. In elk pends. no. 389), 
31. Rhoicosphenia curvata (Kiitz.) Grun. In mpy ponds 
(no. 389), and on stones in shallow water (ti 496 ai and 430). 
Var. marina (W. Sm.) Van Heurck. On bottom of boat 
(no. 421 
2 conema gractle (Rabenh.) G. 8._West. On stones in 
shallow visser 44 (no. 430 
( . Amphora salina W. Sm. On rocks in shallow water 
no. 454 
84, A, coffeiformis (Ag.) Kiitz. Small stagnant pool (no. 471). 
5. Rhopalodia gibba (Kiitz.) O. Mill. On stones in shallow 
water (no. 4 
36. R. gibberula (Ehrenb.) O. Mill. In ee ponds (no. 389), 
and in algal scum of stagnant pool (no. 4 
mee paradoxa Gmel. Aeagee Cladophora on bottom 
of boat (no. 4 
38. Nitsackia Palea (Kiitz.) Gru In swampy ponds 
(no. 389) and on oe bottom of the Sion (no. 422); also rare in 
the sare (no. 4 
39, reggae “Rabenb. In swampy ponds (no. 389). 
