Subkingdom VII. Tunicata.— Sac-like metazoa, with branchial-sac: Ascidia. 
Subkingdom Vertebrata.— Internal skeleton; notochord or back-bone; nervous cord dorsal and 
separated from body-cavity; circulation complete; limbs not more than four. 
Division I. Acrania, ) No head, brain, heart, or limbs; white-blood corpuscles; numerous ciliated gill-slits: 
ARRANGEMENT OF REPRESENTATIVE FORMS. 
367 
bO 
.P 
’C 
p 
a> 
bo 
<2 
.•8 
p s 
b a 
"<S 
ft 
ea 
a> 
-P 
■ - > 
Mg 
60 
I I 
I I 
.Q o3 
o +? 
bo .2 
3 3 
>> § 
(S3 T3 
S o 
a 2 
>> 2 
,p o 
2 w 
o 
O hJ 
j S 
2 o 
02 « 
S * 
Cu pi 
CO M 3 0? 
~ £ 
develop through tadpole state; two occipital condyles; heart of three cavities; skin soft. 
_ , . __ _ , ( gills permanent: Menobranchus. 
Order 1. Ukodela.— 1 Tailed ; < ... f „ , . 
( gills temporary: Salamandra. 
Order 2. Lahyrintiiodontia _Extinct; bony scales, and complex teeth. 
Order 3. C^oii.ia.—S nake-like; no limbs: Ccecilia. 
m ... A l no teeth: Bufo. 
Order 4. A»o 0 aA.-Tailless; gills temporary; j upper ^ only: Rana 
