Echin. 1 
XIY. ECHINODERMA. 
BY 
F. A. Bather. 
CONTENTS. 
Introduction 
Corrigenda in Previous Records 
I. — Titles 
II. — Biology. 
a. Evolution. 
i General Principles ...... 
ii Relations of Echinoderma ..... 
iii Phytogenies of smaller groups .... 
b. Morphology. 
i Anatomy ........ 
(This is divided into Classes a— h, as under IY, and 
each Class is subdivided as follows) : — 
1. General Accounts. 
2. Symmetries. 
3. Homologies of Classes. 
If. 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 
b. In form and surface-characters . 
c. In colour 
d. Meristic (1 & 2) 
e. Abnormalities 
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