Siboga-Expeditie 



Vla 





THE 



PORIFERA OF THE SIBOGA-EXPEDITION 



THE GENUS PLACOSPONGIA 



BY 



G. G. J. VOSMAER and J. H. VER n 



With five plat es 



^ os „ 



late E. j. BRILL 



PUBL1SHERS AND PRINTERS 



LEYDEN I902 



