914 Remarks on Classification of Vertebrata, : 
MAMMALIA.—Mesoceele tubular; men 
SAUROPSIDA ( = reptiles and birds); ccelian roof quadrilobate, forming try 
mesoccele laterally extended; roof pair of optic lobes. i 
ilobate. 
- 
p 
AMNIOTA = Abranchiata = reptils, 
birds, and mammals; aulic floor ap 
ANAMNIOTA = Branchiata — Amphibia proximately vertical. 
+ Dipnoi; aulic floor horizontal. i 
i MICRAULICA (aula small; cerebral hem 
MEGAULICA (aula large; cerebral hem- ispheres extended vertically); =Am 
ispheres extended horizontally or un- phibia, Dipnoi, reptiles, birds, and 
i mammals. 
phibia, Dipnoi, and Branchiostoma. 
N 
MonoceLia ( encephaloccele single; PoLYCŒLIA (encephalocele segmented; 
1 ‘ 
neuron epaxal only; axon unseg- neuron partly preaxal; axon ~~ 
mented) ; —Cephalochorda — Acrania rated) == Craniata = achycardia= 
s+ ocardia = Monolocularia — Multilocularia. a 
' Branchiostoma, ; 
PHENOCEELIA (neurocæle persistmi)= 
metamera = Branchiostoma and oibë 
CRYPTOCELIA (neuroccele transitory) = vertebrates, l : 
_ Ametamera = Urochorda — tunicates. NJ | 
CŒLONEURA (neuron hollow) = e 
STEREONEURA (nervous centre solid if data (+ Enteropneusta 2). 
present) = most “ Invertebrates,” N 
' METAZOA. i a 
_ Explanation of the T; able—The more compr ehensive groti 
are below and their divisions above. a 
From the point representing a given group two oe ne 
forming what may conveniently be called a /urca, or two-tined 10% 
-The vertical tines form part of a line of direct ascent A oad 
The oblique tines or branches extend to the left, and indicilt 
groups not in the line of succession. | : 
For convenience the furcas may be numbered from belot 
upward, and the groups mentioned as direct and oblique, like 
tines which represent them. 7 
_ +ae only unfamiliar terms which are not self-explanato 
mesocele, the cavity of the mesencephal, or segment ge 
lobes, and aula, the mesal division of the prosoccele, oF ae 
the Prosencephal. Prearal and epaxal are synonymes ofp 
and epichordal, Monolocularia and mudtilocularia refer to the © 
diac cavities, ae 
For the ‘sake of brevity the arithmetical signs t 
lus, minus, and equal) are employed. . 
