PLATE 33 



Fig. 18. Dorsal view of anal cirrus. X 1450. 



Fig. -19. Left lateral view of anal cirrus. X 1450. a.c., anal cirrus; 'b.g., 

 basal granule; c.r., ciliary rootlet; p.gl., coagulated protoplasmic globule. 



Fig. 20. Ventral view of anal cirri, fibers and plates lying among the dis- 

 integrating ectoplasm. Anal cirri have turned 90 degrees on their long axis. 

 X 1450. a.c., anal cirrus; a.c.f., anal cirri fiber showing portion of its plate 

 dorsal to the cirrus; e.g.^ and e.g.,, small and large ectoplasmic granules. 



Fig. 21. Plates and fibers of five frontal cirri. X 1430. 



Fig. 21a. Dissociated fiber plates of the ventral cirri with their attached 

 fibers. X 1450. 



Fig. 22. Lateral view of a detached menibranelle previous to disintegration. 

 X 625. 



Fig. 22a. Disintegrating menibranelle showing the component cilia each 

 with its basal granule and ciliary rootlet. X 625. &.#., basal granule; c.m., 

 membranelle cilium; c.r., ciliary rootlet; p.gl., protoplasmic globule. 



Fig. 23. A frontal cirrus attached to the disintegrating ectoplasm.. X 625. 

 e.g., ectoplasmic granule; f.c., frontal cirrus. 



[470] 



