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21-29. Spermatogenesis in Ophioglo^iium pendulum. .-^ 950; 21 shows 34-37. Spermalogenesis in B. oirginianum; 38-41, in Kaulfussia ; 



spermatocyte before final nuclear division, with two 42, 43, in Danaea. All X 950. 



blepharoplasts, bl; 22, 23, nuclear spindle from side and 44. Nearly ripe spermatozoids of Angiopleris. X 950. n, nucleus; 



pole; 24-29, development of spermatozoid ; n, nucleus of bl, blcpharoplast ; c, cilia; i', vesicle. 



spermatozoid ; c, cilia; V, piotoplasniic vesicle. 45. Nearly ripe archegonium of Dano^a, showing apparent ventral 



30-32. Three stages in development of archegonium of O. pendulum. canal cell, v. 



X 275. b, basal cell; n^, n-, neck canal cells. 46-48 Recently fertilized egg-cells of Dansa. .sp, spermatozoid (>) 



33. Venter of archegonium showing apparently a ventral canal cell, 0. within the egg-nucleus. 



n, one of the nuclei of the neck canal cell. X 650. 



