PART ITT. 
THE ANIMAL KINGDOM. 
SYNOPSIS OF THE PRINCIPAL GROUPS. 
PROTOZOA.— Unicellular animals, of which the germ under- 
goes no segmentation in development. The protoplasm 
often differentiated into an internal granular portion, 
the endosarc; and an external hyaline portion, the 
ectosarc. No nervous system, nor body cavity, but 
usually a nucleus, and a contractile vesicle. 
Ruizopopa. No mouth ; provided with pseudopodia. 
GREGARINIDA. No mouth; no pseudopodia in the 
adult ; parasitic. 
InFusoriA. A mouth; generally with one or more cilia. 
No attempt has been made to catalogue the Protozoa, of 
New Zealand. The only special papers are 
On an operculated infusorian.—Hutton, Trans. Roy. Micros. Soc., 
1878, p. 49. 
On a new infusorian.—Hutton, Trans. N.Z. Inst., XI., p. 330. 
CaQRLENTERATA.—Body cavity opening exteriorly by the 
mouth. Furnished with thread cells. Nervous system 
absent or indistinct. Body of two membranes an 
ectoderm and endoderm, often with a mesoderm between 
them. 
PoRIFERA. Alimentary and body cavities identical ; 
oral openings numerous. 
Hyprozoa. Alimentary and body cavities identical ; 
oral opening single ; reproductive organs internal. 
