W. WEST AND G. S. WEST: ALGA-FLORA OF YORKSHIRE. 1 7 



determination was kindly made for us by Karl E. Hirn, of 

 Helsingfors, Finland. It has not previously been recorded from 

 the British Isles, 



42. CEdogonium princeps (Hass.), Wittr. 

 N.W.— Near Sedbergh. 



43. CEdogonium vesicatum (Lyngb.), Wittr. 

 Mid W.— Bramhope (J. Abbott). 



N.E.— Strensall (W. B. Turner). 



44. CEdogonium Ahlstrandii Wittr. 

 N.E. — Pilinoor, near Thirsk. 



This species has not previously been recorded from the 

 British Isle.s. 



45. CEdogonium subsetaceum Kiitz. 

 N.W.— Near Sedbergh. 



46. CEdogonium delicatulum Kiitz. 

 S.W.— Askern. 



N.E. —Strensall (W. B. Turner). 



47. CEdogonium tapeinosporum Wittr. 

 N.E. — Pilmoor, near Thirsk. 



Not previously recorded from the British Isles. 



Family CYLINDROCAPSACE^. 

 Genus CYLINDROCAPSA Reinsch, 1867. 



48. Cylindrocapsa geminella WoUe var. minor Hansg. 

 N.E.— Carlton Bank. 



Only known elsewhere in the British Isles from Cambridge- 

 shire. 



Order CONFERVOIDE^: ISOGAM^. 



Family ULVACE^E. 



Genus ENTEROMORPHA Link., 1820. 



49. Enteromorpha intestinalis (E), Link. 

 Generally distributed in ditches and drains throughout the 



county ; also more rarely in ponds. 



S.W.— Bradfield (Rev. R. A. Gatty). Goole (H. F. Parsons). 

 In the Thorn River or Dyke, Rossington (F. A. Lees). In the 



