136 



EXCURSIONS OB' THE PAST YEAR. 



"We are indebted to Mr. Sirason for the following list of diatoms, 

 found in these marshes. He remarks — " I feel confident that I 

 shall ultimately be able to record at least 50 species from this pro- 

 lific locality." 



Bacillaria paradoxa 

 Achnanthes brevipea 

 Actinocyclus undulatus 

 Amphiprora alata 

 Biddulphia aurita 

 Cocconeis scutellum 

 Coscinodiscus eccentricus 



lineatus 



Melosira nummuloides 

 Navicula Amphisb^na 



— didyma 



punctulata 



Smithii 



Nitzscbia dubia 



siarma 



Pleurosigma acuminatum 



angulatum 



Pleurosigma attenuatum 



Balticum 



delicatum 



fasciola 



Hippocampus 



littorale 



quadratum 



scalprum 



Grevillii 



Surirella Brigbtwellii 



gemma 



ovata 



striatula 



Synedra tabulata 

 Tryblionella acuminata 

 marginata 



July 4. Keston Common. 



Batrachospermum moniliforme, and a few desmids were found. 

 The bogs were very nearly dried up. 



July 18. Esher. 



Very little of microscopical interest was found at this excursion, 

 owing to the very dry weather. Mr. Reeves gathered Senebiera 

 didyma and Pilularia globulifera on the common. 



August 1. Hampton Court. 



Cristatella mucedo 

 Limnias ceratophylli 

 (Ecistes crystal linus 

 Lacinularia sociaiis 

 Carchesium polypinum 

 Zootbamium arbuscula 

 Stentor polymorpbus 



Actinophrys Sol 



■ Eicbornii 



Antbopbysa MuUeri 

 Difflugia ? 



Spongilla lacustris 

 Hydrodictyon utriculatum 



August 15. Higham. 



Mr. Simson found some diatoms in a state of conjugation, but 

 unfortunately was unable to name the species. It is mentioned here 

 to induce others to look for them again next year. ■ 



