46 BRITISH 



and provided with 2-4 spines, and with a series of 2 or 

 4 spines just within each lateral margin, the two median 

 ones in the latter case being more conspicuous, lateral 

 margins themselves sometimes provided with a secon- 

 dary series of 4 spines. Angles occasionally with 

 traces of about two or three concentric series of minute 

 distant denticulations, of which the apical series of 

 spines above-mentioned are well- developed members. 



Zygospore unknown ?* 



Length, not including spines, 19 '5-25 [j. ; breadth, not 

 including spines, 18-26 [Ji ; breadth of isthmus 6-7 '5 (ju 



ENGLAND.- -Westmoreland ! (Biss.). Lancashire! W. 

 -and N. Yorks ! Surrey! Devon (Bennett). ? Dartmoor 

 (Harris). 



WALES. Capel Curig !, bog below Llyn Idwal !, Llyn- 

 y-cwm-ffynon !, Llyn Teyrn, Snowdon !, and Bettws-y- 

 coed (Roy), Carnarvonshire. Ffestiniog, Merioneth ! 



SCOTLAND.--? General, but scarce!, zygospores from 

 Glen Coe, Argyle (Roy & Biss.). Dumfries ! Hoy, 

 Orkneys ! 



IRELAND. General in all boggy districts ! Clare 

 Island, Mayo ! 



Geogr. Distribution. Austria. Norway. Sweden. 

 ? United States. ? N. W. Canada. Brazil. 



There lias been much confusion in the past with regard to 

 St. Simonyi Heimerl and St. Reinschii Roy, but there seems little 

 doubt now that the species recorded by W. & G. S. West from 

 various parts of the British Isles as St. Reinschii is in reality St. 

 Simonyi Heimerl. Both Dr. Lutkemiiller (' Desm. Millstatter- 

 sees,' 1900, p. 23) and Dr. Borge ('Sao Paulo Siisswasseralgen," 

 p. 53) have pointed out this fact, and the writer believes that, 

 before his death, Professor West was in agreement with the two 

 continental algologists on this point. Whether or not St. 

 Reinschii Roy (= Staurastmm sp. Reinsch, 'Contrib. ad Alg. 

 Fung.' 1875, t. 17, f. 5) has actually been seen from the British 

 Isles is somewhat doubtful. Ro}^s first remarks on the subject 



* The Desmid recorded by Roy & Biss. ('Scott, Desm.' 1894, p. 24) as Nf. 

 J\i inschii with zygospores is possibly St. Simony i Heimerl. The authors give 

 neither description nor figure. 



