18 ANATOMY OF THE RABBIT. 
Phylum CHORDATA. Animals with notochord and gills. 
+ Protozoa, ANNULATA, MOLLUSCA, etc., invertebrate phyla. 
Sub-Phylum CRANIOTA.  Chordates with organized head region. 
+ AcRANIA. Lancelets. Also Ascidians and worm-like Chor- 
dates, sometimes separately classified. 
VERTEBRATA. 
Class MAMMALIA. Warm-blooded craniotes, with hair coat. 
Young nourished from mammary glands. 
+ Pisces, AMPHIBIA, REPTILIA, AVEs, lower vertebrate classes. 
Sub-Class PLACENTALIA. Mammals with placenta. 
+ MARSUPIALIA. Viviparous mammals without placenta. 
{ MONOTREMATA. Oviparous mammals. 
Order RODENTIA. Gnawing placentals, with chisel-like incisors. 
{+ CARNIVORA, UNGULATA, PRIMATES, etc. Various placental 
orders otherwise adapted. 
Sub-Order DUPLICIDENTATA. Rodents with two pairs of 
upper incisors. 
7 SIMPLICIDENTATA. One pair ot upper incissors. 
Squirrels, Gophers, etc.. 
Family LEPORIDAE. Hares and Rabbits. 
{ OCHODONTIDAE. Picas). 
tEquivalent groups. 
