Il8 YORKSHIRE NATURALISTS' UNION. 



N.E. — Pilmoor, near Thirsk. Malton. 

 S.E. — Hornsea Mere. 



566. Crucigenia quadrata Monen, 1830. 

 Mid W. — Langcliffe, near Settle. 



Genus COHNIELLA Schroder, 1897. 



567. Cohniella staurogeniseformis Schroder. 

 N.E. — Not uncommon in a pond near Rievaulx Abbey (vii. 

 1898). 



The specimens agreed very well with Schroder's description 

 and figures (Bericht. Deutsch. Rotan. Gesellsch. 1897, xv., p. 

 373, t. xvii., f. 5). Diam. cells without spines 3 — S'Sl^-'^ length 

 of spines 2-5 — 3-8 /a. There were five spines on the exterior 

 margin of each cell. 



This plant has not been previously recorded for the British 

 Isles. 



Sub-Family Pseudoccenobie^. 

 Genus MISCHOCOCCUS Nag., 1849. 



568. Mischococcus confervicola Nag. 

 S.AV.— Shipley (ix. 1896). 



Mid W. — Boston Spa (iv. 1897). Cam Fell (viii. 1896). 

 N.W.— Cowgill Wold Moss, Widdale Fell (iv. 1897). 

 N.E. — Pilmoor, near Thirsk (vi. 1898). 



Sub-Family Rhaphidie.«. 

 Genus DACTYLOCOCCUS Nag., 1849. 



569. Dactylococcus infusionum Nag. 

 S.W.— Bradford. Clayton. 



Mid W. — Harrogate. 

 N.E. — Near Scarborough. 

 S.E.— Market Weighton. 

 570. Dactylococcus rhaphidioides Hansg. 

 S.W.— Bradford. 



The cells were mostly fusiform, sigmoid, or sublunate, and were 

 2-2 '5 [J- in diameter. 

 It has not been previously recorded for the British Isles. 



Trans, Y.N.U., 1899 (piil). July 1901). I!ot. Series, Vol. 5. 



