All specimens of P. leonhardschultzei have either a bifid or double tubercle beneath the fourth finger, and some have a bifid distal tubercle beneath the third finger.
"A Review of the Middle American Tree Frogs of the Genus Ptychohyla"
William E. Duellman
Vaughn implies that anterior and posterior cutting edges extend the length of the teeth in Colobomycter; these are restricted to the distal third of the teeth in Delorhynchus.
"Two New Pelycosaurs from the Lower Permian of Oklahoma"
Richard C. Fox
In order to facilitate the description of the placing of the wires by means of which communication is to be established between the electrodes and the binding posts, I shall term the end of the wire that is to be attached to the electrodes the distal, that which is attached to the binding posts the proximal end.
"The Electric Bath"
George M. Schweig