Piate $2, 
1-4. Asthenosoma coriaceum A. Ag.; ‘Challenger ” Station 173. 
Abactinal system of specimen 125 mm. in diameter. 
Abactinal part of left posterior ambulacrum and interambulacrum, seen from the 
interior; same specimen as fig. 1. 
Part of left posterior ambulacrum and interambulacrum of same specimen, seen from 
the abactinal side. 
The same as fig. 3, seen from the interior. 
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