or 



in i he more ventnil purt, as v/c ■3..^ix r.e-j iatur, li.c lv;o 



the 



forks of the lateral bundle arise in^aci oscopic or indnsial 



halves of the segments (l.b.f. Fig, 6b) » In section VI 

 the plorome of the basicopic lialf [;ives rise to the pla- 

 cental bimdlo of the soruc and to the br;inch corinectin,;; 

 this v'itii the lateral biindle (pa«b.,pa«br». Pigs. 03 - GO, 

 6S). 



Of tlie sections on '.he ventral s do of the marginal 

 cell, th.e plerome of section II divides to form rather 

 large isodiametric cellG (pl« Figs, oj., 5-1-) v/hich ulti- 

 mately form tlie gel^inizing tissue of the dorsal part of 

 the capsule described by Hanstein (*o2) and Riissov (*72)« 

 The plerome of section V divides by a longitudinal ejid 

 radial anticline (l»a«. Figs. 47, 51) a.nd grows around 

 under th.e inner end of the cells of the sorus, and the 

 inner end of section VI (Figs. 51 - 54). Tiie ultimate- 

 fate of the plerome of this section is probabl, to help 

 form the dorsal pL^jrt of the gelatinous ring along \/ith 

 that of section II . I may also help to form the stalk 

 by v/hich the indusiujn is connected io this ring, but the 

 development of this was no', followed out in detail in the 

 later stages and therefore no definite statement cm be 

 made. Tlie periblom of both these sections developes v ■;■ 

 slightly as far as followed, and as that of section V 

 is pushed tu-ound nuder the bcise of the sorus (Fig. 52) it 



