EXPLANATION OF PLATE XLlX. 

 ASTEROTDEA. 



Henricia heteractis. 

 Fig. 1. — Full-grown animal, x 1^. 

 Fig. 2. — An adambulacral plate with its armature, x 20. 



Coscinasterias dubia. 

 Fig. 3. — Large pedicellaria from disc, x 70. 



Fig. 4. — Small pedicellaria from a wreath around one of the 

 dorsal spines, x 70. 



OPHIUROIDEA. 



Pectinura dyscrita. 

 Fig. 5. — Side view of three arm-joints, x 5. 

 Fig. 6. — Abactinal view, x 5. 

 Fisf. 7. — Actinal view, x 5. 



