Echin. 1 
XIV. ECHINODEKMA. 
BY 
F. A. Bather. 
CONTENTS. 
Page 
Introduction 3 
Corrigenda in Previous Records 6 
I. — Titles 7 
II. — Biology. 
A. Evolution. 
i General Principles 31 
ii Relations of Echinoderma 31 
iii Phylogenies of smaller groups . . . . 31 
B. Morphology. 
i Anatomy . 32 
(This is divided into Classes a— h, as under IV, and 
each Class is subdivided as follows) : — 
1. General Accounts. 
2. Symmetries. 
3. Homologies of Classes. 
Jf. Skeletal tissue or Stereom„ 
5. Skeletal anatomy. 
6. Hydrocoel and associated cavities, Respi- 
ratory organs. 
7. Coelom and other Body-cavities and their 
Contents. 
8. Digestive system. Cuvierian organs. 
9. Nervous systems and sense-organs. 
10. Mesodermal tissues (exc. skeletal). 
11. Axial organ or Ovoid gland. 
12. Generative organs and gonads. 
ii Variation : — 
a. In form . 34 
b. In form and surface-characters ... 34 
c. In colour . 34 
d. Meristic (1 & 2) 34 
e. Abnormalities 34 
