Sheppard : Yorkshire Naturalists at Brough. 



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Nitzschia Palea ... ... ... ... — — — — — 6 



Nitzschia punctata ... ... ... 1 — — — — — 



Nitzschia sigma ... ... ... . .. 1 — — — — — . 



Nitzschia Tryblionella ... ... ... 1 — — — — — 



Nitzschia Tryblionella var. levidensis ... 1 — — — — 



Nitzschia vermicularis ... ... ... — — 3 — — — 



Pinnularia viridis ... ... ... ... — 2 — — — — 



Pleurosigrna acuminatum .. . ... ... — — — — — 6 



Pleurosigrna attenuatum ... ... ... — — — ■ 4 — 6 



Pleurosigrna Spencerii var. Smithii ... — ■ — — 4 — — 



Pleurosig-ma strigilis ... ... ... 1 — ■ — — — — 



Rhoicosphenia curvata ... ... 1 •-- 3 — — — 



Stauroneis anceps ... ... ... ... — — — — 5 — 



Stauroneis Smithii ... ... ... ... — — — 4 — — 



Surirella minuta ... ... ... ... — — — — 5 — 



Surirella ovalis ... ... ... ... — — 3 — — — - 



Surirella ovalis var. ovata ... ... 1 — - — — — — 



Surirella striatula ... ... 1 — — — — — 



Synedra radians ... ... ... ... — 2 3 — — — 



Synedra pulchella ... ... ... ... x — — — — — 



Synedra ulna ... ... ... ... — — 3 4 — ^~ 



Synedra ulna var. longissima ... ... 1 2 — — — 6 



Synedra ulna var. oxyrhyncus ... ... — — — — 5 — 



Tabellaria flocculosa ... ... ... 1 — — — — — 



All of the above species, however, are included in a ' List of the 

 Diatoms occurring around Hull,' which is being published this 

 year by the Hull Scientific and Field Naturalists' Club. Accom- 

 panying the list will be a figure of every species. 



With regard to the Mosses, Mr. J. J. Marshall, the Hon. 

 Secretary of the Bryological Committee, w T rites : — ' Owing to the 

 extreme dryness, this meeting was not a favourable one for the 

 collection of mosses, except in the shady parts of Welton Dale. 

 These plants were in such a shrivelled condition that it was 

 almost impossible to distinguish them, and in consequence many 

 have been determined since the excursion. Three collectors 

 gathered 33 mosses and 4 hepatics, all of common distribution 

 in the East Riding and not of sufficient rarity to warrant more 

 than a passing notice. The list, however, is of interest in being, 

 representative of the district. Ditrichum flexicaule, a limestone- 

 loving species, deserves special mention.' The following is 

 a complete list of the mosses gathered :— 



Mollia viridula (L.) Lindb. Ditrichum flexicaule 



Ceratodon purpureus (L. ) Brid. (Schleich.) Hampe. 



1901 August 2. p 



