242 ANNALS OF SCOTTISH NATURAL HISTORY 



100. S. qi/adrangu/are, Breb. Very rare. Aberdeen, at Birse- 



more Loch, near Dinnet, and Dalbagie. 



101. S. Reinschii, Roy. General, but scarce. With zygospores, in 



Argyle, Glen Coe (Mr. Archer). 



102. .S! repandum, Perty. Very rare. Aberdeen Glen Callater. 



103. S. rhabdophorum, Nordst. Extremely rare. Aberdeen (or 



Forfar ?) table-land north-west of Canlochan. 



104. S. rostellum, n. sp. Rare. 



Small, slightly longer than broad, broadly oval, constriction 

 shallow, opening wide; semi-cell flatly oval, spiny, spines small, 

 the one next the constriction rather larger and directed 

 downwards, more prominent at one angle owing to a peculiar 

 twist in the semi-cell giving it a considerable resemblance 

 to a bird's beak, a number of small spines (about 14) are 

 arranged round the margin of the semi-cell and 2 to 3 rows 

 within the margin ; end view quadrangular, with sides con- 

 cave, spiny, and angles a little produced, one more promi- 

 nent on account of the twist. Membrane smooth ; isthmus 

 broad. Length, 31-33^; breadth, 29-31 //,; isth., 13-14^. 



It seems unnecessary to compare this species with any 

 other (our Plate III. fig. 3). 



Ross near Tain and Strathpeffer ; Inverness Skye, at 

 the head of Glen Sligachan ; Aberdeen many localities from 

 Scotston to Girnoc ; Kincardine Rickarton ; Perth Glen 

 Garry ; Argyle Glen Coe. 



105. S. rugulosui/i, Breb. Rare. Ross near Strathpeffer; Kin- 



cardine on the north side of Cairnmonearn. 



1 06. 5. saxonicum, Bulnh. Rare. Aberdeen near Mill of Maiden- 



craig, Haughton, Tillyfour, old channel of Dee below Aboyne, 

 near Dinnet School, Koynach Moor in Cromar, Castleton, 

 Braemar; Kincardine near Durris Bridge, Cammie, Dai- 

 brake, Slack of Birnie ; Forfar Lundie Bog, Easter Ogil in 

 Fern (our Plate III. fig. 10). 



107. S. saxonicum, Reinsch. Very rare. Aberdeen Powlair in 



Birse, and Dinnet. 



This is probably nothing more than a form of S. aculeatum, 

 Ehr., but it is a remarkable one. I have seen few examples. 



1 08. S. scabrum, Breb. Not common. Shetland, Sutherland, 



Ross, Moray, Aberdeen, Kincardine, Forfar, Perth, Fife, 

 Argyle, Arran. With zygospores, in Aberdeen near Cambus- 

 o'-May. They are globular, sometimes slightly oblong, with 

 short stout spines, 3-4-fid at the apex. About 10 to 13 

 visible round the margin. Diameter without spines, 32-35 /M ; 

 length of spine, 5-6 /*. 



