Echin. 1 
XIY. ECHINODEBMA. 
BY 
M. Grant. 
CONTENTS. 
Page 
Introduction 3 
Corrigenda in Previous Records 8 
I. — Titles 8 
II. — Biology. 
a. Evolution. 
i General Principles 37 
ii Relations of Echinoderma 38 
iii Phytogenies 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. 
4- 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 glatid. 
12. Generative organs and gonads. 
ii Variation : — 
a. In form (Vacant) 
b. In form and surface-characters ... 40 
c. In colour 1 . i i , , 40 
d. Meristic (1 & 2) . . . . . . 40 
e. Abnormalities 41 
1905. [VOL. XLII.] 
F 1 
