ADVANCE IN LOWER PLANT AND ANIMAL FORMS 167 



PLATE LXVII 



PLATE LXVII (mithmed) 



Fio. 12. — A social colony of zooids (Saljnnfiaca najnformis) attached to vegetable fibre, x 800. 



Fig. 13. — One of same moie highly magnified. This and Figs. 14 and lb show nucleus and contractile vesicles. 



Fig. 14. — Normal fully expanded zooid {Snlpingceca fusiformis), x 1.500. 



Fig. 15. — Zooid with collar and flagelluni retracted assuming amreboid state, x 1.500. Zooids have the jjower of projectincf and 

 withdrawing their flagellum and nf opening and closinj,' their collar by centrifugal and centripetal movements (the Authoi'). 



Fift. 16. — Encysted zooid, x 11500 ; the sarcode undergoing change prior to reproduction. 



Fig. 17. — Encysted zooid with body broken up into numerous spore-like substances, x 1500. The changes are iinalogous to those 

 wliich occur in the impregnated developing ovum (the Author). 



Fig. 18. — Spore-like substances further developed and escaping from the lorica as monoflagellate germs, x 1500. 



Fig. 19.— Zooid {Salpingieca inqmllata) with protecting covering or lorica in its normal fully extended state, x 1250. 



Figs. 20, 21, 22, and 23.— Zooids in their amcelwid form undergoing transverse fission, x 125(1. The transverse fission is to be 

 regarded as a form of segmentation (the Author). 



Fig. 24. — Attached collarless zooid secreting its protective lorica, x 1250. 



Fig. 25.— Small calcareous-spiculed sponge {Urantia compressa, Bowerbank) sliowing pavement arrangement of collared monads 

 with pore apertures, x 800. 



Figs. 26, 27, 28, 29, 30, 31, and 32.— Various forms assumed by collared monads of same sponge, x 1600. Show nucleus and con- 

 tractile vesicles. 



Fig. 33.— Isolated monads with bodies filled with ingested carmine particles ; one showing collar and flagellum, another flagellum 

 only, a third with flagellum and body sarcode projected as pseudopodia, x 1600. 



Fig. 34.— Two collared monads ; the one protruding its flagellum, the other its body sarcode, x 1600. 



