Spiny dogfish (Squalus acanthias) are little sharks that occur in cold temperate waters in many places around the world. Spiny dogfish are often found in deeper waters, and commonly occur around the south and east coasts of the South Island of New Zealand. Dogfish skeletons are mostly made of cartilage - this model shows the cartilage from the head.
The technical term for this piece of cartilage is splanchnocranium (pronounced splank-no-cray-nee-um).
Dr Daniel Thomas (Institute of Natural and Mathematical Sciences, Massey University) teaches a dogfish anatomy class in the Vertebrate Zoology course at Massey University (199.212). The dogfish cartilage is a key specimen in this anatomy class.