Definition of "cartilagineous"

[T]here are other Bodies beſides Shells found in the Earth, reſembling the Teeth and Bones of ſome Fiſhes, […] the Vertebres of Thornbacks and other Cartilagineous Fiſhes there found, and ſold for Stones among the Gloſſopetræ, […]

1692, John Ray, “Of Formed Stones, Sea-shells, and Other Marine-like Bodies Found at Great Distances from the Shores?”, in Miscellaneous Discourses Concerning the Dissolution and Changes of the World. […], London: […] Samuel Smith, […], page 109