Plate 50. 

 1-6. Kamptosoma indistinctum A. Ag. ; "Challenger" Station 272. 



1. Actinal system of specimen 42 mm. in diameter. 



2. Abactinal system of the same specimen as fig. 1. 



3. Odd anterior ambulacrum of the same specimen ; the dotted line indicates the position 



of the ambitus. 



4. Part of odd ambulacrum on the abactinal side; the abactinal plates are the bottom 



plates. 



5. Part of odd ambulacrum, seen from the interior. 



G. Inside view of two plates of the odd anterior ambulacrum on the actinal side near 

 the ambitus. 



