1802.] Phenomena and Develop 309 



fecundation proper of egg cell by antherozooid, ex. Moss Plant. 



Fig. 21. (Redrawn from Tlmret in Bessey's Bot. p. 267). 

 Oosphere of Fucus vesiculosus surrounded by spennatozoids. 



Fig. 22. (Adapted from Schmitz Ann. and Mag. of Nat. Hist, 

 vol. xiii, Ser. 5, (1884) PI. 1/figs. lG-lfyDudranaya purpuHfera. 

 (a) Tricbogyne with adhering spermatia ; (b) egg cell ; (c) con- 

 jugating cell cutoff at end of ooblastema filament; (d) auxil- 

 iary cell ; (e) later stage after conjugation of auxiliary cell and 

 ooblastema filament. 



Fig. 23. (Adapted from Schmitz, 1. c.) Glccosij)honia capillaris, 

 (letters as in fig. 22.) 



Figs. 24-29. Redrawn from Foil, Comptes Rend us 1. c.) 

 Fecundation of the egg of the sea urchin. 



Figs. 30-35. (Redrawn from Strasburger, Zellbild, und 

 Zellteil, 3 Aufiage, Pis. iv and v). Development of the embryo 

 sac and egg apparatus of Monotropa hypopitys. Fig. 30. 

 Nucellus with embryo sac; and (a) its primary embryo sac 

 nucleus. Fig. 31-34, enlargement of embryo sac and for- 

 mation of the two apical tetrads of nuclei. Fig. 35. (a) 

 synergidse; (b) egg cell; (c) the two nuclei, one from each 

 tetrad that fuse forming the nucleus proper of the embryo sac ; 

 (d) antipodal cells. 



Fig. 3G. (Origi nal). Camera sketch of a longitudinal section 

 of the pistil of Yucca angustifolia, x. about 5 diam. Showing 

 the continuous sty ler tube with numerous pollen tubes running 

 down to the ovules. 



Fig. 37. (Original). Camera sketch, x. 400 diam. of the ovule 

 of Yucca angustifolia, showing one ovule coat, the nucellus, the 

 embryo sac with its enclosed egg apparatus, and a pollen tube; 

 (c) that has entered the micropyle of the ovule and penetrated 

 to the embryo sac. 



Fig. 38. (Original). Conducting tissue. Cross section of the 

 style of Yucca angustifolia. Camera sketch, x. 150 diam. 



Figs. 39-42. (Redrawn from Strasburger Befrucht. bei den 

 Phaner. Taf. 1.) Fig. 39. Young pollen grain during division 

 into generative and vegetative cells. Fig. 10. Mature pollen 

 grain; (a) vegetative nucleus; (b) generative nucleus. Figs. 

 41 and 42. Portions of the pollen tube with the generative 

 nucleus in division. 



