Note 4 — 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
The greater proportional length of the symphysis is noted by Duméril and Bibron.