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PLATE XVII. 
Conolampas Sigsbei A. Aq. 
Seen from the actinal .side, deniideil, natural size. 
Tlie same, seen from the interior of the test, natural size. 
Abactinal system. 
Aetinal system, seen from the interior of the test. 
The same as Fig. 4, seen from the actinal side. 
Anal system. 
Interior view of the same. 
Portion of the right anterior ambulacrum. 
A piece of the same seeu from the interior of the test. 
Plates of the lateral posterior interambulacral region of the median region of the te.?t. 
Plate of the lateral posterior interambulacral region of actinal side adjoining the ambitus. 
