Echih. 1 
XIV. ECHINODERMA. 
BY 
F. A. Bather. 
CONTENTS. 
Page 
Introduction 3 
Addenda et Corrigenda in Previous Records .... 8 
I. — Titles 9 
II. — Biology. 
a. Evolution. 
i General Principles ...... 37 
ii Relations of Echinoderma . i . . . 37 
iii Phylogenies of smaller groups .... 38 
B. Morphology. 
i Anatomy 38 
(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. 
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 setise-organs. 
10. Mesodermal tissues (exc. skeletal). 
11. Axial organ or Ovoid gland. 
12. Generative organs and gonads, 
ii Variation : — 
a. 
In form ..... 
41 
b. 
In form and surface-characters . 
41 
c. 
In colour 
41 
d. 
Meristic (I & 2) . 
41 
e. 
Abnormalities * . » 
41 
