Echin. 1 
XIY. ECHINODERMA. 
BY 
F. A. Bather. 
CONTENTS. 
Page 
Introduction ........... 3 
Corrigenda in Record for 1898 ....... 8 
I. — Titles.9 
II. —Biology. 
a. Evolution ......... 33 
b. Morphology. 
i Anatomy ........ 33 
(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. 
4- Skeletal tissue or Stereom. 
5. Skeletal anatomy. 
6. Hydroccel and appendages, Respiratory 
organs. 
7. Other body-cavities and their contents. 
8. Digestive system. Cuvierian organs. 
9. Nervous system and sense-organs. 
10. Mesodermal tissues (exc. skeletal). 
11. Axial organ. 
12. Generative organs and gonads. 
ii Variation:— 
a. In form ....... 37 
b. In form and surface-characters. . . 37 
c. In colour ....... 37 
d. Meristic ....... 37 
e. Abnormalities ...... 38 
iii Secondary Sexual Characters 
a. Differences of Form or Structure . . 38 
b. Differences of colour.38 
c. Protection of young.38 
