The photograph looks like Placospongia sp. This is a circumtropical (and Mediterranean) genus. There are about 10 species which can only be identified by microscopic examination of the spicule complement.
Also, this identification is not certain as there are a few similar-looking sponges in other genera, e.g. Didiscus or Myrmekioderma. Recognizing sponges from photos is not foolproof!
Placospongia is a genus of sea sponges belonging to the family Placospongiidae.This genus is characterized by a high density of siliceous spicules. Members of this genus are known to be eaten by hawksbill turtles.
Characteristics Placospongia: Thick crust to branching. Brown to tan externally, lighter internally. Surface armored with cortical plates and a pattern of grooves which contain the inhalant surface. Hard and tough in consistency.
Direct children (13):
Species Placospongia anthosigma (Tanita & Hoshino, 1989)
Species Placospongia caribica Rützler, Piantoni, Van Soest & Diaz, 2014
Species Placospongia carinata (Bowerbank, 1858)
Species Placospongia cristata Boury-Esnault, 1973
Species Placospongia decorticans (Hanitsch, 1895)
Species Placospongia intermedia Sollas, 1888
Species Placospongia melobesioides Gray, 1867
Species Placospongia mixta Thiele, 1900
Species Placospongia ruetzleri Van Soest, 2017
Species Placospongia santodomingoae Becking, 2013
Species Placospongia graeffei Lendenfeld, 1898 accepted as Placospongia decorticans (Hanitsch, 1895) (junior synonym)
Species Placospongia labyrinthica Kirkpatrick, 1903 accepted as Geodia labyrinthica (Kirkpatrick, 1903) (genus transfer)
Species Placospongia melobesioides sensu Schmidt, 1870 accepted as Placospongia cristata Boury-Esnault, 1973 (synonym)