W. WEST AND G. S. WEST : ALGA-FLORA OF YORKSHIRE. 9 1 



410. Cosmarium pseudoexiguum Racib. 



N.E. — Strensall Common : a form somewhat attenuated to- 

 wards the apices of the semicells. Length, i8 /x ; breadth, 77 

 ju.; thickness, 4 "8 //. 



This species has not previously been recorded for the British 

 Isles. 



411. Cosmarium obliquum Nordst. 

 S.W. — CuUingworth. 



Mid W. — Malham Tarn Bog. Penyghent. Oughtershaw 

 Tarn (forma major Nordst). 



N.AV.— Mickle Fell. Birkdale Tarn Moss. Lund's Fell. 

 Widdale Fell (2,000 ft,). Snaizeholme Beck. Cowgill Wold 

 Moss, Widdale Fell. 



N.E. — Peat deposit, Filey. 



412. Cosmarium rectangulare Grun. 1868. 



[Syn. C. gotlandicum AVittr. 1872]. 

 N.W.— Mickle Fell. 



N.E. — Pilmoor, near Thirsk. 



S.E. — Skipwith Common ! (Rev. W. Fowler). 



413. Cosmarium minimum West & G. S. West. 

 N.E. — Pilmoor, near Thirsk. 



Not previously recorded for the British Isles. 



414- Cosmarium succisum West. 

 Mid W. — AVigton Moor. 



S.E. — -Riccall and Skipwith Commons. 



415- Cosmarium Heimerlii AVest & G. S. AA^est. 



[Syn. C. jninutissiiimm Heimerl non Arch.]. 

 Var. tumidum AA^est & G. S. AA^est. 

 A variety with the angles a little rounder; with an inflation on 

 each side of the vertical view. Length, 9-10 /i; breadth, 

 10-11-5 i"'; breadth of isthmus, 2-5-3 i"-; thickness, 5-5 /a 

 S.W. — Greetland, near Halifax. 

 Mid AA^ — Ingleborough. Ribblehead. 

 N.W.— Lund's Fell. Cowgill AA^old Moss, AViddale Fell. 



416. Cosmarium Sphagnicolum West & G. S. AA^est. 

 Very minute, a little broader than long, moderately constricted, 



