_SILURIDÆ._
"Skin naked, or with osseous scutes, but without scales. Barbels
always present; maxillary bone rudimentary, margin of the upper jaw
formed by the premaxillaries only. Suboperculum absent; adipose fin
present or absent." (Günther.)
RHINEASTES, Cope.
U. S. Geol. Survey of the Terrs., 1872, p. 638.
A genus allied to the recent _Ichtælurus_ but differing in the
inferior grooving of the vertebræ and in the rough exostoses of the
cranial bones. It differs from _Phareodon_ in having the usual band
of bristle-like teeth on the dentary.
Rhineastes ---- ?
Represented by a portion of the dentary and hyomandibular bones of a
large cat-fish from Bridger Butte.
The dentary is broad and shallow, grooved below, and deeply striated
on the external face. As much of it as is preserved is straight.
The teeth are small, subequal throughout, and very numerous. The
hyomandibular is broad and thick, and has a striated surface. The
condyle is peculiar in having two separate articular faces above and
below, one convex and the other flat.