COSMAR1UM. 85 



Kerlocli, and Dalbrake, Kincardine ; Clova Table-land, 

 Forfar; Moncreiffe Hill, Perth (Roy fy Bissett). Loch 

 Tay, Perth ! Rhiconich, Sutherland ! Orkneys ! Xot 

 uncommon in the plankton, Shetlands ! 



IRELAND. Gortahork, Loughs Cloncarney. Dar- 



O / ' 



ragh, Garten, and Sproule, Donegal ! Lough Derryadd, 

 Armagh ! 



Geoyr. Distribution. Germany. Galicia in Austria. 

 Poland. Australia. 



C. abbreviatum should be compared with C. sexangulare 

 and with C. pseudobiremum. 



Forma minor West & G. S. West. (PL LXXII, 



fig. 12.) 



C. abbreviatum Kacib. forma minor West & GK S. West, Alga-fl. Yorks. 

 1900, p. 92. 



About half the size of the type. 



Length 8 p. ; breadth 9 p.. 



ENGLAND. Skip with Common, E. Yorks ! 



Var. planctonicum AY. & G. S. West. (PI. LXXII, 



fig. 13.) 



C. abbreviation Eacib. var. W. & Gr. S. West, Scott. Freshw. Plankton, I, 



1903, p. 541, t. 15, f. 6. 

 C. abbrei'iatum Eacib. var. planctonicum W. & GK S. West, Further 



Contrib. Plankton Scott. Lochs, 1905, p. 500 ; Comp. Study Plankton 



Irish Lakes, 1906, p. 85. 



Semicells with the superior angles more rounded. 



Length 19-29 p, ; 1)readth 22-30 p. ; breadth of isth- 

 mus 5'5-8/>t; thickness 10'5 13*5 ft. 



ENGLAND.- -Plankton of Buttermere and Crummock 

 Water, Cumberland ! Plankton of Red Tarn, Helvellyn, 

 Westmoreland ! 



WALES. Plankton of Llyn Cwlyd, Llyn Elsie, 

 Cwellyn, and Llyn Ogwen, Carnarvonshire ! 



SCOTLAND. Plankton of Lochs of Ross, Inverness, 

 and Perth ; and of Lewis, Outer Hebrides ! 



IKE LAND. Plankton of Loughs in Mayo, Galway, 

 and Kerry ! 



*/ 



This variety retains its characters very constantly, and we 



