The species is of Western Atlantic occurrence, so Jenkin's identification is likely erroneous.
Van Soest, R.W.M.; De Voogd, N.J. (2018). Calcareous sponges of the Western Indian Ocean and Red Sea. <em>Zootaxa.</em> 4426 (1): 1-160.[details]
Jenkin, C.F. (1908). The Marine Fauna of Zanzibar and British East Africa, from Collections made by Cyril Crossland M.A., in the Years 1901 & 1902, The Calcareous Sponges. <em>Proceedings of the Zoological Society of London.</em> 1908 : 434-456.[details]