10 Transactions of the Society. 



Cosmarium quadratum Ealfs. 



„ Cucumis Corda. 



„ Ealfsii Breb. 



„ pyramidatum Breb. 



„ crenatum Ealfs. 



„ undulatum Corda. 



„ tetraoplithalmum Ktz. Above Easedale Tarn. 



„ Botrytis Bory. 



„ margaritiferum Turp. 



„ Brebissonii Menegh. A good species. 



„ speciosum Lund. 



This beautiful species has already been recorded from Ireland 

 by Archer. 



„ amoenum Breb. 



„ ccelatum Ealfs. 



„ ornatum Ealfs. 



„ cristatum Ealfs. Furness Fells and Wetherlam, 



Lancashire. 

 „ Logiense Biss. (Journ. E. Micr. Soc, 1884, 



p. 194, t. V. fig. 4). 

 „ turgidum Breb. 



„ Cucurbita Breb. 



„ moniliforme Turp. 



„ WittrocMi Lund. (Desm. Suec, p, 31, t. iii. 



f. 14). Fig. 15. 



Frond very minute, shape of G. margaritiferum, but not 

 crenulated, nearly circular in outline, 25 yu, long, 22 • 5 /x broad ; 

 the two frustules slightly unequal; constriction deep; isthmus 

 10 /* broad. Cell- wall not punctated, perfectly smooth. 



Frequent in bog pools, Loughrigg; not recorded before in 

 Britain. Certainly a mature form, as it was several times seen in 

 division. 



Cosmarium ohlongum mihi {Cosmarium sp. Eeinsch, Cont., 

 p. 82, t. xlii. f. 3). Fig. 16. 



Frond minute, 55 /* long, 22 /i broad at its broadest part ; each 

 frustule elliptical, longer than broad, equally rounded at the base 

 and the apex ; isthmus 11 fju broad. Cell- wall not punctated, per- 

 fectly smooth. 



Bog pools, Loughrigg ; new to Britain. Eesembles C. monili- 

 forme, except that the frustules are elliptical instead of circular. 



Xanthidium armatum Breb. 



„ aculeatum Ehrb. 



„ fasciculatum Ehrb. 



Xanthidium spinulosum n. sp. Plate II. fig. 17. 



