200] 



The Classification of Lower Organisms 



Family Castanellida [Castanellidae] Haeckel (1879). Skeleton nearly globular 

 with numerous pores. Castanidium. 



Family Circoporida [Circoporidae] Haeckel (1879). Like the foregoing, but with 

 the pores gathered about the bases of radiating spines. Circoporus. 



Family Tuscarorida Haeckel (1887). The main pore on an extended neck, the 

 skeleton accordingly flask-shaped. Tuscarora. Tuscarilla. 



D. Shell strongly dorsiventral. 



Family Challengerida [Challengeridae] J. Murray. Shell finely pitted. Chal- 

 lengeron. 



Family Medusettida Haeckel (1887). Shell smooth or with small spines. Medu- 

 setta. 



E. Shell bilaterally divided into two parts. 

 Family Concharida [Concharidae] Haeckel (1879). 



Family Coelodendrida Haeckel (1862). The shell bearing extensive branched 

 appendages. Coelodendrum. 



Class 5. SARKODINA (Hertwig and Lesser) Biitschli 



Sarkodina Hertwig and Lesser in Arch. mikr. Anat. 10 Suppl. 43 (1874). 

 Class Sarkodina Biitschli in Bronn Kl. u. Ord. Thierreichs 1, 1 Teil: Inhalt ( 1882). 

 Class, subclass, etc., Rhizopoda Auctt.; class, subclass, etc. Sarcodina Auctt. 

 Amoeboid organisms without flagellate stages, the pseudopodia of the character 

 of lobopodia; without skeletons, without or with shells of various materials. 



Fig. 39 — Chaos Protheus: a, b, cells x 25, after the original figures of Pelomyxa 

 carolinensis by Wilson (1900); c, mitotic figure x 2,000 after Short (1945). 



