COSMA1UUM. 217 







of semicell circular, with three acute granules at each 

 side. Vertical view elliptic and granulate except for 

 a smooth area in the centre, granules at the middle on 

 each side larger and more prominent, marginal granules 

 acute. Chloroplasts axile, with two pyrenoids. 



Zygospore unknown. 



Length 39-42 /x ; breadth 33-34-5 /x ; breadth of 

 isthmus 9*5-11 JJL ; thickness 22-23 /x. 



ENGLAND.- -Brothers' Water and near Bowness, 

 "Westmoreland ! Mickle Fell and Pilmoor, X. Yorks ! 

 Near Ely, Cambridgeshire ! Near Chapel Wood, 

 Surrey ! New Forest, Hants ! 



WALES. --Capel Curig and Llyn-y-cwm-ffynon, Car- 

 narvonshire ! 



SCOTLAND. Rhiconich, Sutherland ! Near Dinnet, 

 Aberdeen (Roy $ Bissett). Lewis and Harris, Outer 

 Hebrides ! 



ICELAND. Loughs Cloncarney and Darragh, Done- 

 gal ! Ballynahinch, Loughs Creggan and Shannacloon- 

 tippen, Galway ! Kenmare and near Lough Brin, 

 Kerry ! 



t/ 



Geogr. Distribution. France. Norway. Sweden. 

 Bengal (var.). United States. 



C. qitinarium is a characteristic species with a wide British 

 distribution. Its marginal granulation is of a similar nature 

 to that of C. Boeckii, but the semicells are more trapezoid,, 

 and the granulation within the margin and at the centre is 

 very different. 



Forma irregularis Nordst. 



C. quinarinm Lund, forma irregidaris Nordst. Norges Desm. 1873, p. 13; 

 Eoy. & Biss. Scott. Desm. 1894, p. 173. 



Semicells with 5-9 central granules disposed in an 

 irregular manner ; other characters as in the type. 



SCOTLAND. Loch Euthven, Inverness (Roy <J- 

 Bissett). 



Geocjr. Distribution.- -Norway. 



This form may possibly have as wide a distribution as the 

 type, but we have never observed it. 



