Echin. 1 
XIY. ECHINODERMA. 
BY 
F. A. Bather. 
CONTENTS. 
Page 
Introduction.. 3 
Corrigenda in Previous Records.. . 7 
I. —Titles.8 
II. — Biology. 
a. Evolution. 
i General Principles ... . . . . 37 
ii Relations of Echinoderma ..... 38 
iii Phylogenies of smaller groups .... 38 
b. Morphology. 
i Anatomy.38 
(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 ....... 42 
b. In form and surface-characters... 42 
c. In colour ....... 42 
d. Meristic (1 & 2) . . . . . . 42 
e. Abnormalities ...... 43 
