w. WEST AND G. s. West : Ar.cA-PLoriA of voRKSHikic. 109 



Mid W.— Bramhope (J. Abbott). Ilkley (W. H. Dikes). Wig- 

 ton Moor. Penyghent. 



N.E. — Gormire (W. B. Turner). Pilraoor, near Thirsk. 

 S.E. — Riccall and Skipwith Commons. 



517. Arthrodesmus Incus (Br^b.) Hass. 



S.W. — Greetland, near Halifax (with zygospores). CuUing- 

 worth. Keighley Moor. 



Mid W. — Adel Dam (W. B. Turner). Bride Cross, above 

 Farnley Moor. Malham Tarn. Cocket Moss, near Giggleswick. 

 Bog two miles south of Clapham (with zygospores). Penyghent. 

 Near Buckden. 



N.W.— Cowgill Wold Moss, Widdale Fell. Mickle Fell. 

 Lunds Fell. 



N.E. — Gormire (W. B. Turner). Strensall Common. Pil- 

 moor, near Thirsk. Moorland stream, near Scarborough. 



Var. Ralfsii (\Vest & G. S. West). [Syn. A. Jia/fs/i West]. 



S.W.— CuUingworth. 



N.E. — Pihnoor, near Thirsk. 



S.E. — Riccall Common. 



518. Arthrodesmus bifidus Breb. var. truncatus West. 

 N.E. — Strensall. Pilmoor, near Thirsk. 



Length, 10-12 fi; breadth, io-ii'2/i; breadth of isthmus, 



4'5 M' 



519. Arthrodesmus octocornis Ehrenb. 



[Syn. Xanthidhim odocorne Ralfs]. 



Mid W.— Bramhope (W. B. Turner). Ilkley (W. H. Dikes). 

 AVigton Moor. Cocket Moss, near Giggleswick. Bog two miles 

 south of Clapham. 



N.E. — Strensall (VV. B. Turner). Pilmoor, near Thirsk. 



Genus ONYCIIONEMA Wall., i860. 



520. Onychonema filiforme (Ehrenb.) Roy & Biss. 

 [Syn. Tessararthra filiformis Ehrenb. ; Sphcerozosma 

 filiformis (Ehrenb.), Rabenh.]. 



N.E. — Pilmoor, near Thirsk, abundant. 

 S.E. — Skipwith Common. 



