The Voyage of EM.S,.Challenger." 



Hexactinellida. Pl.XCn. 



FE.Schiilze andGFirlsch del 



Lith An£tvWern:r k'WinTer Frsnkfurr^/M 



Figl-8 VOLVULINA SO LUTA, F E Schulze . Fig. 9. VOLVU LINA SlGSBEEl. Oscar Schmidt. 



