62 



ZOOLOdY 



Fig. 45.— Aulactinium actinastrum. c calymma ; km. central cai)sule ; n. nucleus ; op 

 operculum ; ph. phtuudivmi. (Frum Lang's Comparative Anatomy, after Haeckel.) 



cent, caps 



FIG. -le.— Actinomma asteracanthion. A, the shell with portions of the two outer 

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

 cti''. r((/i.s. central capsule ; tx. caps. /tr. extra-capsular protoplasm ; nu. nucleus ; sk. 1, outer,. 

 sk. 2, middle, sk. S, inner sphere of skeleton. (From Butschli's Protozoa, after Haeckel and 

 Hertwig.) 



