} 
| 
i 
5 
| 
Puate 71, 
1-7. Spatagocystis Challengeri A. Ag.; “Challenger” Station 147. 
1. From the interior, seen facing the actinostome of specimen 48 min. in length. 
2. The same as fig. 1, seen in profile from the interior, facing the right anterior ambu- 
lacrum. 
8. 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 surrounding 
v ’ > ro) ta) 
plates of the odd interambulacrum and the course and position of the plates of 
the adjoining posterior interambulacra. 
6. Development of the coronal plates of the actinal side surrounding the actinostome of 
the same specimen. 
7. Showing the primary, secondary, and miliary tubercles of the third plate from the 
mouth of the right anterior ambulacrum of the same specimen. 
