174 ANNALS OF SCOTTISH NATURAL HISTORY 



142. C. Rcinschii, Archer (Cos. sp. Reinsch., " Contrib. Alg. and 



Fung.," p. 83, Taf. XVIII. fig. 4). Extremely rare. Perth 

 Folotry in Fowlis Wester. 



143. C. reniforme, Archer (Cos. margaritifertitn, Turp., /? reniformis 



Ralfs, "Brit. Desmid.," p. 100, Tab. XVI. fig. 20). General, 

 but scarce. 



The zygospore of this species, as pointed out by Mr. 

 Archer long ago, is perfectly smooth and globular. It has 

 not been observed in Scotland. 



144. C. retusum (Perty), Rab. Extremely rare. Aberdeen Glen 



Clunie, Braemar; Birse. 



145. C. Schliephackeanum, Grunow. 



Forma Spetsbergensis, Nordst. ( = C. asphtzrosporum, Nord., 

 ined.) Rare. Inverness Erin (Mrs. Farquharson) ; 

 Aberdeen Alford, Dinnet (with zygospores), Morven; 

 Kincardine Kerloch (with zygospores), Muiryhaugh, 

 Glen Dye ; Forfar Barrelwell near Brechin, Clova 

 Tableland ; Perth Fowlis Wester ; Stirling ; Argyle 

 -Glen Coe. 



146. C. sexangidare, Lundell. Somewhat rare. Caithness Loch 



Hempriggs ; Aberdeen Scotston Moor, Brimmond, Slew- 

 drum, Bottomend and Birsemore near Aboyne, Pittellachie 

 in Cromar ; Kincardine Crathes, Loch Loirston, and Paldy 

 Hill. 



147. C. Siinii, n. sp. 



Fairly large sized, about one -sixth longer than broad ; 

 sides nearly straight, ends semicircular, constriction deep, 

 and opening very widely ; surface covered with pearly 

 granules arranged in perpendicular and concentric rows. 

 Length, 53-58 /z; breadth, 45-50 //, ; isthmus, 20-22 p,. 

 (Our Plate II. fig. 16.) 



Named in honour of Mr. John Sim, a skilled Kincardine- 

 shire botanist. 



Very rare. Aberdeen Corrie Etchachan (Ben Macdhui). 



148. C. sini/osiini, Lundell. Very rare. Ross Poolewe ; Aberdeen 



Gight, Vat of Culblean, near top of Lochnagar ; Kincar- 

 dine near Cammie ; Argyle near Oban, near Tobermory 

 in Mull ; Arran Goat Fell and Glen Ranza. 



/3 decedens, Reinsch. Extremely rare. Aberdeen Vat 

 of Culblean ; Kincardine Den of Garrol. 



149. C. S/ewdntmense, Roy (" Desmids of the Alford district," in 



"Scott. Nat.," January 1890, p. 204). (Our Plate II. fig. 

 19.) Not common. Caithness, Ross, Inverness, Nairn, 

 Aberdeen, Kincardine, Forfar, Perth, Fife. 



