SUMMARY OF LITERATURE Cl'IKI) 451 



WiELAND, G. R., A Study of some American fossil cycads. II. The leaf struc- 

 ture oi Cy aid coidca. Amer. Jour. Sci. IV. 7:305-308. pi. 7. 1899. 



, A study of some American fossil cycads. III. The female fructification 



oi Cycadeoidea. Amer. Jour. Sci. IV. 7:383-391. />/5. 5-/o. 1899. 



, The Yale collection of fossil cycads. Yale Sci. Monthly 6:1-11. pi. i. 



1900. 



, A study of some .\merican fossil cycads. IV. On the microsporangiate 



fructification of Cycadeoidea. Amer. Jour. Sci. IV. 11:423-436. 1901. 



, The proembryo of Bennettiteae. Amer. Jour. Sci. IV. 18:445-447. 



pi. 20. 1904. 



, American fossil cycads. Publ. no. 34, Carnegie Institution of Washing- 

 ton, pp. 296. ph. jo. figs. ij<S. 1906. 



, Historic fossil cycads. Amer. Jour. Sci. IV. 25:93 loi. 1908. 



, The Williamsonias of the "Mixteca Alta." Bot. Gazette 48:427-441. 



figs. 10. 1909. 

 WiGGLESWORTH, Grace, The cotyledons of Ginkgo hiloba and Cycas revoluta. 



Annals of Botany 17:789-791. 1903. 

 Wild, G., On Trigonocarpum olivaejorme. Trans. Manchester Geol. Soc. 



26: pp. 16. pi. 2. 1900. 

 Williamson, W. C, On the structure and aflfinities of the plants hitherto known 



as Stembergiae. Mem. Manchester Tit. and Phil. Soc. 14:340-358. pi. 10. 



1851. 

 , Contributions towards the history of Zamia gigas. Trans. Linn. Soc. 



Bot. 26:663-674. pis. 52, 5j. 1870. 

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Dictyoxylon, Lyginodendron, and Heterangiiim. Phil. Trans. Roy. Soc. 



London B 163:377-408. pis. 22-^1. 1873. 

 , On some fossil seeds from the Lower Carboniferous beds of Lancashire. 



Rep. 45th Meedng British Assoc. (1875): 159-160. 1876. 

 , On the organization, etc. VIII. Ferns (continued) and gymnospermous 



stems and seeds. Ann. Mag. Nat. Hist. 18:268-273. 1876 (preliminary 



notice); Proc. Roy. Soc. London 25:68-73. 1877 (abstract); Phil. Trans. 



Roy. Soc. London B 167:213-270. pis. j-i6. 1878 (full paper). 

 , On the organization, etc. X. Phil. Trans. Roy. Soc. London B 171: 



493-539- Pl^- ^4-21. 1880. 

 , On the organization, etc. XII. Phil. Trans. Roy. Soc. London B 174: 



459-475- Pi^- 27-34- 1883. 

 , On the organization, etc. XIII. Phil. Trans. Roy. Soc. London B 



178:289-304. pis. 21-24. 1887 (p. 299). 

 , On the organization, etc. XVII. Phil. Trans. Roy. Soc. London B 



181:89-106. pis. 12-15. 1890. 

 , and Scott, D. H., Further observadons on the organization of the fossil 



plants from the Coal-measures. III. Lyginodendron and Heterangium. 



Phil. Trans. Roy. Soc. London B 186:703-779. pis. iS 21. 1896. 



