ON SCOTTISH DESMIDIE/E 169 



latter is larger. With such differences as these, we 

 fail to see what is to be gained by making them 

 forms of each other. 



91. C. monochondrum, Nord. Very rare. Inverness Loch Ruth- 



ven (Mrs. Farquharson) ; Aberdeen - - Dinnet, Birsemore 

 Loch, south side of Birsemore. 



92. C. vwnomazurn, Lundell. 



fi polymazitin, Nord. Very rare. Ross near View 

 Rock, Strathpeffer (Mrs. Farquharson). 



93. C. Nagelianum, Breb. Very rare. Aberdeen Springhill near 



Aberdeen, pool near Loch Dawin ; Kincardine near Cowie. 



94. C. nasittii/n, Nord. 



fi granulata, Nord. Very rare. Aberdeen near the 

 summit of Lochnagar, Corrie Etchachan (Ben 

 Macdhui). 



95. C. nephroideuin (Wittr.), n. sp. ( = C. Portiamun, Archer. 



P nephroideum (Wittr.) (Our Plate II. fig. 3.) Length, 

 25 //, ; breadth, 22 /x ; isthmus, 7 /x. Our Scotch 

 examples are considerably smaller than those re- 

 corded by Messrs. Wittrock and Nordstedt. Very 

 rare. Aberdeen Glen Clunie near Braemar ; 

 Arran. 



96. C. nitidiilum, De Not. Rare. Aberdeen formerly near a 



well on Aberdeen Links, Heughhead near Aboyne, foot of 

 Culblean (east side); Kincardine N.W. side of Kerloch ; 

 Perth Meal Odhar. 



97. C. norimbergense, Reinsch. Very rare. Aberdeen Slew- 



drum ; Forfar in a marsh N.W. from Menmuir Church. 



98. C. notabile, Breb. Not common. Inverness, Aberdeen, 



Kincardine, Forfar, Perth, Argyle. 



Var. minor, Wille. Perth Craiganlochan. 



99. C. Nymannianum, Grun. Not common. Sutherland, Ross, 



Inverness, Aberdeen, Kincardine, Forfar, Perth, Argyle, 

 Arran. 



100. C. obliquum^ Nord. Not common. Sutherland, Ross, Inver- 



ness, Aberdeen, Kincardine, Forfar, Perth, Argyle, Arran. 

 The three forms are about equally common. 



1 01. C. ochthodes, Nord. Not common. Ross, Inverness, Aber- 



deen, Forfar, Perth, Stirling, Fife. 



1 02. C. odontophuruin, Archer, in lit. Small-sized; a little longer 



than broad ; sides nearly straight, but widening out slightly 

 and forming an obscure blunt tooth at each of the upper 

 angles ; ends semicircular ; constriction moderately deep 



