209 
Explanation of Plate II. 
All the figures are of Microphiura decipiens. 
Fig. 1. Ventral side of a specimen with the disk cast ofif. 25 /i. 
— 2.—4. A cast-off disk seen from the ventral side (Fig. 2), in side 
view (Fig. 3) and from the dorsal side (Fig. 4). 25 h. 
Fig. 5. Dorsal side of a specimen with the disk cast ofif. 25 h. 
— fi.—7. Vertebræ in dorsal (Fig. 6) and ventral (Fig 7) aspect. In 
hig. 6 the coalescense of the ambulacrals has begun. The figures 
are so placed as to turn the distal end of the vertebræ upwards. 115 h. 
— 8. 9. Articular surfaces of a vertebra. Ffig. 8 represents the proximal, 
fig. 9 the distal surface. The figures are so placed as to turn the 
dorsal side of the vertebra upwards. 115 h. 
— 10. Inner pore and tentacle scale. 115 h. 
1.—12.—1910. 
