Sykes and. Stiles.—The Cones of the Germs Selaginella. 535 
Mitchell, G.: Contributions towards a Knowledge of the Anatomy of the Genus Selaginella : V. 
The Strobilus. Ann. of Bot., xxiv, 1910, p. 19. 
Pfeffer, W. : Die Entwickelung des Keimes der Gattung Selaginella. Hansteins Abhandlungen, 
1870-1. 
Scott, D. H. : On the Structure and Affinities of Fossil Plants from the Palaeozoic Rocks. On 
Cheirostrobus. Phil. Trans. B., 189, 1897, p. 1. 
Sykes, M. G. : The Anatomy and Morphology of Tmesipteris. Ann. of Bot., xxii, 1908 (1), p. 63. 
-: Notes on the Morphology of the Sporangium-bearing Organs of the Lycopodiaceae. 
New Phyt., vii, 1908 (2), p.41. 
-: Note on the Sporophyll of Lycopodium inundatum. New Phyt., viii, 1909, p. 143. 
Watson, D. M. S. : The Cone of Bothrodendron mundum. Manchester Memoirs, Lit. and Phil. 
Soc., lii, Part i, 1908. 
-: On Mesostrobus. Ann. of Bot., xxiii, 1909, p. 379. 
Williamson, W.: Organization of Fossil Plants of the Coal Measures: Part xix. Phil. Trans. 
B., 1893. 
Zeiller, R. : Etudes des Gites minerauxde la France. Bassin Houiller et Permien de Blanzy et du 
Creusot, Fasc. ii. Paris, 1906, p. 140. 
DESCRIPTION OF FIGURES IN PLATE XLI. 
Illustrating the paper on the cones of Selaginella by Miss Sykes and Mr. Stiles. 
Fig. 1. Cone of S. pu/nila. r = dorsal flap of sporophyll; r* = projection on lowest sporo¬ 
phyll. x 10. 
Fig. 1 a. Lowest sporophyll of cone of S. pumila. r = dorsal flap, x 12. 
Fig. 1 ,b, c. Sporophylls from middle region of cone of S. pumila. g = groove in sporophyll 
stalk, x 20. 
Fig. 2. Longitudinal section of the apex of a cone of S. pumila , showing origin of spo¬ 
rangium ( sp ) from stem tissue. I = ligule. x 54. 
Fig. 3. Radial section of sporophyll of S. pumila. r = dorsal flap ; a = small cavity below 
stele; d = line of dehiscence, x 54. 
Fig. 4. Tangential section of cone of S. pumila, to show groove in stalk of sporophyll, more 
pronounced in proximal portion (upper sporophyll), less pronounced in the distal portion (lower 
sporophyll). The line of dehiscence ( d ) is cut twice in a tangential section of the sporangium. 
g = groove in sporophyll stalk into which the sporangium fits, x 64. 
Fig. 5, a and b. Front and side views of sporophyll of S. spinosa. s — small dorsal swelling; h = 
ventral depression, x 20. 
Fig. 5 c. Saddle-shaped sporangium of .S’. spinosa. 
Fig. 5 d. Section of sporophyll of S. spinosa. a = air cavity in dorsal swelling, x 40. 
Fig. 6, a and b. Parts of young and old cones of S. hclvetica. r — dorsal projection. 6 b shows 
two young sporangia appressed on either side of r. x 10. 
Fig. 6, c and d. Sporophylls of S. Helvetica, back and side views, x 20. 
Fig. 7. Transverse sections of young cone of S. Helvetica, sp = sporangium ; l = ligule; a = 
air cavity, x 54. 
Fig. 8. Radial longitudinal section of sporophyll of S. Helvetica, showing (a) cavity in dorsal 
ridge traversed by rows of cells or trabiculae, ( b ) the row of cells with lignified walls across the base 
of the sporangium stalk, x 54. 
Fig. 9. Ditto from another sporophyll more highly magnified. Note also cuticularization of 
the epidermis ( e ) of the sporangium stalk, x 170. 
Fig. 10. Sporophyll of S. Jlabellata, enfolding megasporangium, x 10. 
Fig. 10 a. Contents of macrosporangium. 
