284 Carter. — Studies on the Chloroplasts of Desmids. III. 
Lagerheim, G. (1888) : Uber Desmidiaceen aus Bengalen nebst Bemerkungen iiber die geographi- 
sche Verbreitung der Desmidiaceen in Asien. Bihang till K. Svenska Vet.-akad. Handlingar, 
Band 13, No. 9, 1888. 
Lundell, P. M. (1871) : De Desmidiaceis quae in Suecia inventae sunt observationes criticae. 
Nova Acta Reg. Soc. Scient. Upsala, ser. 3, xiii, 1 87 r . 
Lutkemuller, J. (1893) : Beobachtungen liber die Chlorophyllkorper einiger Desmidiaceen. 
Oesterr. botan. Zeitschrift, 1893, Nr. 1 u. 2. 
— (1910) : Zur Kenntnis der Desmidiaceen Bohmens. Verhandl. der k k. Zool.- 
Botan. Ges., lx, 1910. 
Nageli, C. (1849) : Gattungen einzelliger Algen. Zurich, 1849. 
West, G. S. (1909) : The Algae of the Yan Yean Reservoir, Victoria : a Biological and Oecological 
Study. Journ. Linn Soc , vol. xxxix, 1909. 
West, W. and G. S. (1904-11): Monograph of the British Desmidiaceae. Roy. Soc., vol. i, 1904; 
ii, 1905; iii, 1908; iv, 1911. 
DESCRIPTION OF PLATES X-XIII. 
Illustrating Dr. Nellie Carter’s paper on the Chloroplasts of Desmids. 
During the prolonged processes of preparation the specific characters of Desmids are often 
obliterated, but all the species examined were identified, either in the living or carefully fixed 
condition, by the late Professor G. S. West. 
PLATE X. (All x 810.) 
Figs. 1-5. Cosmariuni subtumidum r Nordst. Figs. 1 and 2, front view ; Figs. 3-5, various 
transverse sections. 
Figs. 6 and 7. C. crenatum , Ralfs. Fig. 6, front view ; Fig. 7, optical transverse section. 
Figs. 8 and 9. C. contractuni , Kirchn. Fig. 8, front view ; Fig. 9, optical transverse section. 
Figs. 10 and 11. C. caelatum , Ralfs. Fig. 10, front view ; Fig. 11, optical transverse section. 
Figs. 12 and 13. C. elegantissimum , Lund. Fig. 12, front view; Fig. 13, optical transverse 
section. 
Figs. 14 and 15. C. cucurbita, Breb. Fig. 14, front view ; Fig. 15, transverse section. 
Figs. 16-20. C. punctulatwn , Breb. Figs. 16 and 17, front view; Figs. 18-20, transverse 
sections. 
Fig. 21. C. diplosporum , (Lij-rid.) Liitkem., front view, lower semi-cell in optical section. 
Figs. 22 and 23. C. pseudopyramidatum , Lund. Fig. 22, front view ; Fig. 23, optical trans- 
verse section. 
Figs. 24-7. C. pyramidaium, Breb. Fig. 24, front view; Fig. 25, side view; Fig. 26, optical 
longitudinal section of a large specimen containing numerous pyrenoids; Fig. 27, optical transverse 
section of a similar individual. 
Figs. 28-30. C. speciosum , Lund. Fig. 28, front view; Fig. 29, side view; Fig. 30, optical 
transverse section. 
Figs. 31 and 32. C. depressum, Lund. Fig. 31, front view; Fig. 32, optical transverse 
section. 
Figs. 33 and 34. C. ornatum , Ralfs. Fig. 33, front view ; Fig. 34, optical transverse section. 
Figs. 35 and 36. C. pseudoconncitum , Nordst. Fig. 35, front view; Fig. 36, transverse section. 
PLATE XI. (All x 810.) 
Figs. 37-49, C. ochthodes, Nordst. Fig. 37, front view; ; Figs. 38-41, serial transverse sections 
from the apex of the semi-cell to the sinus ; Figs. 42-4, serial longitudinal sections, parallel to the 
lateral faces of the cell, through one half of the semi-cell and one chloroplast only ; Figs. 45-9, 
