SYSTEMATIC AND CLASSIFICATION. 
Ech. 47 
Branch b. Caliculata. 
Stage a. Anactinogonidiata. 
Class 2. Some Cystidea ? 
Stage B. Actinogonidiata. 
1st Sub-branch. Statozoa. 
Substage i. Apelmatozoic. 
Class 3 ? “ Some Cystidea .” 
Class 4 ? Some Crinoidea. 
Class 5 ? Some Blastoidca. 
Substage ii. Pelmalozoic. 
Class 6. Crinoidea (s.s.). 
Class 7. “ Cystidea .” 
Class 8. Blastoidea (s.s.). 
2nd Sub-branch. Eleutherozoa. 
Division i. Zygopoda. 
Class 9. Echinoidca. 
Division ii. Azygopoda. 
Class 10. Asteroidea. 
Class 11. Ophiuroidea. 
Cuenot (1) proposes the following classification of EcTiinodcrmata : — 
Class ii r. Vehnatozoa . 
1. Cystidea . 
2. Blastoidea. 
3. Crinoidea. 
Class IV. Echinoidea. 
1. Atelostomata. 
Perrier (3) adopts the following classification of Echinodenns : — 
Embranchement A. Anangia , without absorbent canals. 
Stellerids , Ophiurids . 
Embranchement b. Angiophora , with absorbent canals. 
Crinoids , Echinoids , Ilolothuroids. 
2. HOLOTHURIOIDEA. 
Ludwig (1) proposes the following classification of the Ilolothurioidea i 
Order i. Actinopoda (with the tentacle canals springing 
from the radial canals). 
Family 1. Aspidochirotce. 
Class 1. Synaptida. 
Class ii. Ilolothurioidea. 
1. Elasipoda 
2. Pneumonophora 
Class v. Ophiuroidea. 
Class vi. Asteroidea. 
