478 GYMNOSPERMS 



674. WiELAND, Ci. R., A Study of some American fossil cycads. 1. The male 

 flower of Cycadeoidea. Amer. Jour. Sci. I\'. 7:223-26. pis. 2-4. 1899. 



675. , A study of some American fossil cycads. III. The female fructi- 

 fication of Cycadeoidea. Amer. Jour. Sci. IV. 7:383-91. pis. 8-10. 1899. 



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



pi. I. 1900. 



677. , A study of some American fossil cycads. IV. On the micro- 



sporangiate fructification of Cycadeoidea. Amer. Jour. Sci. I\'. 11 :423-36. 

 1 901. 



67S. , Notes on living Cycads. On the Zamias of Florida. Amer. Jour. 



Sci. 13:331-38. 1902. 



679. , The proembryo of the Bennettiteae. Amer. Jour. Sci. IV. 18: 



445-47. pi. 20. 1904. 



680. , American fossil cycads. Publ. No. 34. Carnegie Institution of 



Washington, pp. 296. pis. 50. figs. ij8. 1906. 



681. , Historic fossil Cycads. Amer. Jour. Sci. IV. 25:93-101. 1908. 



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



41. figs. 10. 1909. 



683. , A study of some American fossil cycads. V. Further notes on 



seed structures. Amer. Jour. Sci. IV. 32:133-55. figs. g. 191 1. 



684. , On the Williamsonian tribe. Amer. Jour. Sci. 32 : 433-66. figs. 18. 



1911. 



685. , A study of some American fossil cycads. VI. On the smaller 



flower buds of Cycadeoidea. Amer. Jour. Sci. 33:73-91. figs. 11. 191 2. 



686. , La Flora Liassica de la Mixteca Alta. Bol. Inst. Geol. Mexico. 



No. 31. 1916. 



687. , American fossil cycads. Vol. II. Taxonomy. Carnegie Inst. 



Washington, Publ. 34. 1916. 



688. — — — , On the classification of the Cycadophyta. Am. Jour. Sci. 47:391- 

 406. I 919. 



689. , Certain fossil plants erroneously referred to Cycadales. Bot. Ga- 

 zette 86:32-50. 1928. 



690. WiGGLESWORTH, Grace, The cotyledons of Ginkgo biloha and Cycas re- 

 voliita. Ann. Botany 17:789-91. 1903. 



691. Wild, G., On Trigonocarpon olivaefonne. Trans. Manchester CJeol. Soc. 

 26:pp. 16. pis. 2. 1900. 



692. Williamson, W. C, On the structure and affinities of the plants hitherto 

 known as Sternbergiae. Mem. Manchester Lit. and Phil. Soc. 14:340-56. 

 pi. 10. 1851. 



693. , Contributions toward the history of Zamia gigas. Trans. Linn. 



Soc. Bot. 26:663-74. pis. j2, S3- 1870. 



694. , On the organization of the fossil plants of the Coal measures. IV. 



Diclyoxylon, Lyginodeudron, and Heterangium. Phil. Trans. Roy. Soc. 

 London B 168:377-408. pis. 22-ji. 1873. 



