64 



ZOOLOGY 



SECT. 



71- 



FIG. 46. Aulactinium actinastrum. c. calymma ; km. central capsule; n. nucleus 

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



cent, caps 



rut, 



FIG. 47. Actinomma asteracanthion. A, the shell with portions of the two outer 

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

 tent. caps, central capsule ; ex. caps. pr. extra-capsular protoplasm ; mi. nucleus ; sk. 1, 

 outer, sk. 2, middle, sk. 3, inner sphere of skeleton. (From Biitschli's Protozoa, after 

 Haeckel and Hertwig.) 



