ON SCOTTISH DESMIDIE^E 41 



Inverness in Skye, at the head of Glen Sligachan ; Aber- 

 deen n ear Bridge of Potarch ; Kincardine at Dalbrake in 

 Strachan. 



5. A. octocornis, Ehr. General. Conjugated : Aberdeen Brim- 



mond, and Powlair in Birse ; Kincardine Cammie, and 



Glen Dye in Strachan ; Perth near Buchanty in Fowlis. 



Zygospore globose, or ovoid, with long, slender, tapering, 



acute, simple spines. 



(3 major, Ralfs. - - Not common. Orkney, Sutherland, 

 Ross, Inverness, Aberdeen, Kincardine, Forfar, Perth, 

 Argyle. Conjugated : Aberdeen old road near 

 Aboyne. Zygospore similar to the common form, 

 only larger and with longer spines. Diameter, with- 

 out spines, 26 /A; length of spine, 20 /A. (Our Plate 



II. fig. 20.) 



y iinpar, Jacobs. Very rare. Aberdeen in a pool on 

 Culblean, beside the old road from Tarland to Bal- 

 later. 



6. A. snbulatiis, Kg. Rare. Aberdeen at Slewdrum, Cambus 



O'May, and Glen Clunie. 



7. A. tenuissiniiis, Archer. Not common. Sutherland, Ross, 



Aberdeen, Forfar, Perth. 



COSMARIUM (Corda), Ralfs. 



1. C. abbreviate ?n, Racib. Rare. Ross Loch Kinellan ; Inver- 



ness Brin ; Nairn ; Aberdeen Scotston, south side of 

 Birsemore, Heugh-head, Milton Moor, Culblean, Lochnagar; 

 Kincardine Nigg, Cammie, Kerloch, Dalbrake; Forfar- 

 Clova Table-land ; Perth Moncreiffe Hill. 



2. C. abrupt urn, Lund. Rare. Nairn; Aberdeen Howford, 



Alford, Birsemore Loch, Bogwartle ; Kincardine Dalbrake; 

 Forfar Menmuir, Barrelwell near Brechin. 



3. C. alpestre, n. sp. (C. rotundatum, R. and B.'s MSS.) 



Species large, rounded oblong, a little longer than broad, 

 constriction very slight'; semi-cells smoothly rounded, from 

 a very broad isthmus ; side view circular, from a broad base ; 

 end view very broadly oval ; membrane closely and finely 

 punctate ; isthmus very broad, with a row of rather larger 

 punctae on each side. Length, 90-105 //, ; breadth, 75-90 /A; 

 isthmus, 79 //, ; thickness, 60 //,. (Our Plate I. fig. 6.) This 

 species seems sufficiently distinct to render it unnecessary 

 to compare with other species. Delponte has a species 

 closely resembling it in size and shape, but his species is 

 roughly granulated, while this is finely punctate. 



