PLATE Vb. 
The Lettering is the same in all the Figures. 
A, Axial cord. | m. Muscle. 
ce. Coeliac canal. | ste. Subtentacular canal. 
ge. Genital cord. | T. Tentacle. 
j. Pinnule-joint. | w. Radial water-vessel. 
Zi. Interarticnlar ligament. 
Houorus RANGI, d’Orbieny. 
? ime 
Diam. Page 
Fig. 1. Transverse section of a lower arm-joint, : : aad) 209 
Fig. 2. The upper portions of three pinnule-joints, showing the arma- 
ture covering the bases of the tentacles, . : : «60 208 
Fig. 3. The terminal portion of a pinnule showing the tentacular plates ; 
from a dry specimen, : : ¢ : =? poe JO) 208 
Fig. 4. Inner aspect of an entire ray, showing the rolling in of the 
distal arm-joints, . : ; : : = a 1G 206 
Fig. 5. Ventral aspect of an axillary and the lower part of an arm, 
showing the ambulacral groove, . : ‘ ee ue 206 
