PROCEEDINGS OF SOCIETIES. 115 



.N. virgata, Roper. — Sands at Great Meols, May, 1857; New 

 Brighton, September, 1858. 



■ Sp. {Epithemia marina, Donk.) Sands at New 



Brighton, September, 1858. 



N. dubia, Sm. — Eastham marsh, September, 1858; Skew 

 bridge, Bebington, May, 1856. 



N. bilobata, Sm. — Bidston marsh, October, 1857. 



N. plana, Sm. — Not uncommon. Bidston marsh, &c. 



N. birostrata, Sm. — Eastham marsh, September, 1858. 



N. Closterkcm, Sm. — Not uncommon. Southport sands, Au- 

 gust, 1858; Eastham marsh, September, 1858; Bidston 

 marsh on several occasions. 



JV. Taenia, Sm. — Southport sands, August, 1858. 

 Amphiprora, Ehrenberg. 



A. alata, Kiitz. — Not uncommon in brackish marshes. East- 

 ham marsh, September, 1858, &c. 



A. Ralfsii, Arnott. — New Brighton sands, September, 1858. 



A.paludosa, Sm. — Near Wallasey pool, Seacombe, April, 1857. 



A. duplex, Donk. — New Brighton sands, September, 1858. 



A. vitrea, Sm. — Eastham marsh, September, 1858; New 

 Brighton sands, September, 1857. 



A. pusilla, Greg. — New Brighton sands, September, 1858. 



A. complexa, Greg. — Great Float, April, 1858. 

 Amphipleura, Kiitzing. 



A.sigmoidea, Sm. — Great Float, April, 1858 — Canning Grav- 

 ing Dock, August, 1857, R. Daw. 

 Navicula, Bory. 



N. rhomboides, Ehr. — Bridge at Spital, May, 1857. 



N. lanceolata, Kiitz. — Bidston marsh, May, 1856. 



N. cuspidata, Kiitz. — R. Fender, Bidston marsh, June, 1856. 



iV. Liber, Sm.— Great Float, April, 1858 — Canning Graving 

 Dock, August, 1857, R. Daw. 



N.finna, Kiitz. — Not unf'requent, but always occurs sparingly. 

 Rock in the Dingle, March, 1857, &c. 



N. astiva, Donk. — New Brighton, September, 1858. 



N. elliptica, Kiitz. — Common. 



N. pi/gmaa, Kiitz. — Seacombe, April, 1851; Primrose hill, 

 New ferry, July, 1856. 



N. Jeunerii, Sm. — Bidston marsh, October, 1857; Seacombe, 

 April, 1858; Southport sands, August, 1858, &c. 



N. Wesiii, Sm. — Seacombe, April, 1858. 



N. convexa, Sm, — New Brighton sands, September, 1858. 



N. elegans, Sm. — Pretty frequent in brackish water. Wal- 

 lasey pool, Seacombe, April, 1856; Bidston and East- 

 ham marshes, &c. 



