Note 2 — On the dermal armour of Jacare and Caiman, with notes on the Specific and Generic Characters of recent Crocodilia. By T. H. Huxley, Esq., F.R.S., F.L.S., Prof. of Nat. History, Gov. School of Mines.
Reading edition
According to Natterer, the dental formula of J. nigra and J. fissipes is 18-18/18-18, of J. sclerops 19-19/20-20, of J. callifrons and J. punctulata 20-20/18-18.