Echin . 1 
XIY. ECHINODERMA. 
BY 
F. A. Bather. 
CONTENTS. 
Page 
Introduction ........... 3 
Addenda et Corrigenda in Previous Records .... 9 
I. —Titles.9 
4 
II. —Biology. 
a. - Evolution. 
i General Principles ...... 33 
ii Relations of Echinoderma ..... 34 
iii Phylogenies of smaller groups .... 34 
b. Morphology. 
i Anatomy ........ 34 
(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 ....... 37 
b. In form and surface-characters ... 37 
c. In colour.37 
d. Meristic (1 & 2).37 
e. Abnormalities ...... 38 
