262 G. T. HARRIS ON THE 



of Hampshire and DevonsWre. Journal of the Royal 

 Microscopical Society. Feb. 1890. 



3. Town, J. : Desmids found on Haytor Moor and Bovey 



Heathfield. Torquay Nat. His. Soc.,yo\. ii., No. 2. 1916. 



4. West, W. and G-. S. A Monograph of the British Desmidiaceae. 



Vol. i. (1904); vol. ii. (1905); vol. iii. (1908); vol. iv. 

 (1912). 



5. Harris, G. T. : The Collection and Preservation of the 



Desmidiaceae. Journ. Q.M.G., 2nd Ser. vol xiii., p. 15. 



6. Rendle, a. B. : Preservation of Natural Colour in Plants. 



Nature, vol. xcviii., No. 2454. 



7. JoRGENSEN, J. : Preservation of Natural Colour in Plants. 



Nature, vol. xcviii., No. 2456. 



8. Griffiths, B. M. : The Algae of Stanklin Pool. Birmingham 



Natural History Society, vol. xii., No. 5. 



9. West, G. S. : Variation in the Desmidiaceae. Journal 



Linnean Soc. Botany, vol. xxvii. 1899. 



10. Archer, W. : Quart. Journal Micr. Science, xiii., 1872, p. 100. 



11. West, W. and G. S. : British Freshwater phyto-plankton, 



etc. Proceedings Royal Society, B. vol. Ixxxi. 1909. 



12. Clayden, a. W. : The History of Devonshire Scenery. 1906. 



13. West, G. S. : Algae, vol. i. 1916. 



14. CooKE, M. C. : British Desmids. 1887. ^ 



15. Ralfs, J. : The British Desmidieae. 1848. 



16. Archer, W. : Article Desmidieae in Pritchard's History of 



the Infusoria. Ed. 4. 1861. 



17. West, W. and G. S. : Freshwater Algae from the Orkneys 



and Shetlands. Transactions of the Botanical Society of 

 Edinburgh. Nov. 1904. 



Description of Plates. 



Plate 18. 



Fig. 1. Euastrum oblongum (Grev.) Ralfs, forma nov. This new 

 form from Metherall bog has the apices of the polar 

 lobe truncate and not convex ; the lateral lobes are 

 more retuse than in the type, x 300. 



