PLATE 88. 
1-5. Phrissocystis aculeata A. Ag.; Station 3366. 
. Fragments of specimen 120 mm. in length, seen from the abactinal side, showing 
parts of the left anterior interambulacrum and ambulacrum, and of the left posterior 
ambulacrum and odd interambulacrum with a few adjoining plates on either side. 
. Fragment of a somewhat larger specimen, showing the greater part of the ambital 
plates of the left anterior portion of the test, seen from the abactinal side. 
. Fragment showing a few plates of the odd anterior ambulacrum near the ambitus, seen 
from the interior. 
. Fragment showing the actinostome, seen from the actinal side. 
. Fragment showing the anal extremity in profile; 3-5 are fragments of a specimen about 
120 mm. in length. 
| 
| 
| 
. 
/ 
I 
| 
