SECT. I 



CRYPTOGAMS 



357 



eye-spot are situated ; in the latter genus tlie membrane is separated from the 



Fio. 274.— .4, B, Hacmatococcvs plurialis (x 360); A, swarming cell ; B, formation of swarni-spores. 

 C-G, Haematocncnts Biitschlii; C, formation of gametes (x400); D, gamete ; -E, conjugation of 

 two gametes ; F, G, zygotes (x 800). (C-G, after Blochmann.) 





Fifi. 275. — Volvox (jloliator. A, Colony showing various stages of develoijment of ova and 

 spermatozoids (x 165). B, Bundle of sperniatozoids formed by division from a single 

 cell (x 530). C, Spermatozoids (x 530). D, Egg-cell surrounded by .spermatozoids in 

 the mucilaginous membrane (x 2<>5). (After F. Cohn.) 



protoplast by a gelatinous layer except at the anterior end. llaematococcus 



