BY L. HUSSAKOF
During the past few years, fish remains have been discovered in the Kaibab formation of Arizona. Most of the specimens thus far collected are teeth of sharks, with a crushing type of dentition, and shark spines. They are rare in the formation, occur singly, and are generally collected from the hard limestrone strata in an imperfect condition which makes possible only generic identification.
This is the first record of the occurrence of this Permian fish fauna. The forms noted include the following: Deltodus mercurii Newberry, Psephodus, a new species of Janassa (Petalodontidae), which is described from a tooth, a large fin-spine of Hybodus, and detached teeth of a ganoid, probably Lepidotus.
The Kaibab fish fauna shows a continuance into the Permian of some elasmobranch families especially numerous in the Carboniferous seas, a condition that has been noted in the . . .