Platk 71. 

 1-7. Spatagocystis Challengeri A. Ag. ; '^ Challenger " Statioa 147. 



1. From the interior, seen facing the actinostome of specimen 48 iniu. in length, 



2. The same as fig. 1, seen in profile from the interior, facing the right anterior amba*| 



lacrum. 



3. Abactinal system of same specimen. 



4. The same as fig. .3, seen from the interior. 



5. The anal system of the same specimen, seen from the interior, showing the surroundineS 



plates of the odd interambulacrum and the course and position of the plates o' 

 the adjoining posterior interambulacra. 



6. Development of the coronal plates of the actinal side surrounding the actinostome o 



the same specimen. 



7. Sliovving the primary, secondary, and miliary tubercles of the third plate from th' 



mouth of the right anterior ambulacrum of the same specimen. 



^ 



IK 



