SYNOPSIS 



OF AN AERANGEMENT OF 



INVERTEBRATE ANIMALS. 



Jftrst Cable (EwBt. 



The mark <lf indicates specimens or other illustrations exhibited in the Cases. 



Sub-kingdom PROTOZOA. 



7rpMTo§, first ; ^wov, animal. — Lowest forms of animal life, 

 distiuguisbed by tbe absence of cell-formed tissue. 



The very simplest living organism is distinguished from all lifeless 

 forms of matter by, at least, four characters -Individuality, 

 Periodicity, Eeproduction and Assimilation. (See Appendix.) 



The Gregarinidffi, being probably degraded through parasitism, cannot 

 appear in the primary group. 



Class RHIZOPODA (Dujardin). pi^, root; 

 ■jzohc, foot. — Limbs, pseudopodia, formed by simple 

 extensions of tbe soft body. 



Group 1.— Orders MONERA /^ov^jprjc, single, and AMCEBEA 

 uixoi^oi, cbanging. 



In Monera tbe animal is said to be composed of 

 structureless sarcode, capable of emitting 

 pseudopodia, but witbout a nucleus. In 

 Amoebea tbe sarcode exbibits two distinct 

 layers, and contains a nucleus and a con- 

 tractile vescicle. Tbe Amoebea may be divided 

 into two sections — Amoebina, in wbicb tbe 



