64 



ZOOLOGY 



SECT. 



1 ; 4 



\ ' y 







FIG. 10. Aulactinium actinastrum. _ calyinma ; km. central capsule ; . nucleus 

 op. operculum ; ph. phreodium. (From Lang's Comparative Anatomy, after Haeckel.) 



cent, caps 



Tin 



FIG. 47. Actinomma asteracanthion. .4, the shell with portions of the two ontn 

 spheres broken away ; B, section showing the relations of the skeleton to the animal ; 

 cent. caps, central capsule ; ex. caps. pr. extra-capsular protoplasm ; . nucleus ; s/fc. 1, 

 miter, sk. ', middle, sk. 3, inner sphere of skeleton. (From Biitschli's Protozoa, after 

 Haeckel and Hertwig.) 



