350 [Jan. 5, 
{[Cope. 
ahalf inch in length. Those on the inferior or outer margin are most 
slender ; those of the inner stouter and more conic. All the spade-like 
apices are black in the specimen, while the shanks are pale, except the 
premaxillaries, The palatine bones are flattened in one plane, and con- 
tracted at both ends. At the anterior, there is an external concavity 
perhaps for maxillary or premaxillary. <A ridge divides the upper sur- 
* face lengthwise ; the outer edge is thin posteriorly, and there are two 
long grooves which extend to the posterior extremity, probably for sutural 
union with the pterygoid. The premazillary bears a slight resemblance 
to the mandibular bone of a Chimeroid turned upside down. 
M. 
Length portion of an 08 palatinwm.........00+-.e006 0.128 
Do. restored ........ Ss ae ie VEU sas oto Pwncdp sail tae, 1 Lao 
Greatest swiGthl ist. . iannie od. husks i} lathe J Siero nv sa Vitae 
ef thickness on margin “itsicn 008 
Length premaxillary, fragment. Hib DAS 
bi *g dialer side: chistes ted Gaines 025 
Me Rg outer to maxillaryy ss gsi 1.64 -012 
Width ce infront above iis ns Hewaoie gO 
Hength premaxillary, tooth. . wk neatey odes wales 005 
This fish was considerably larger than Hsow reticulatus or H. lucius. In 
the lack of mandible its habits cannot be fully inferred, but the armature 
of the superior bones of the mouth is less powerful relatively than in 
those fishes. 
Found by myself in the blue limestone shale on Butte Creek, south of 
Fort Wallace, Kansas. 
CIMOLICHTHYS. Leidy. 
Proceed. Acad. Nat. Sci. Phila., 1856, p. 202. Trans. Amer. Philosoph. 
Soc., 1856, p. 95. Saurodon, Agassiz, pt. Poiss. Foss. 
In this genus the principal teeth are stout, and have a compressed apex 
with a prominent anterior cut 
one. There are several series of smaller teeth external to the large ones 
in the lower jaw, while in a portion of an upper jaw of one of the species 
these are wanting. Where present, they are more acute than the larger 
ones. The large teeth diminish gradually in length to the symphysis, a 
circumstance which separates these fishes from Hnchodus, where one or 
more of the anterior teeth are elongate. In the species here described, 
the bases of the teeth are enlarged and deprived of cementum coat, but 
there are no true roots. 
The maxillary bone terminates in a narrowed extremity with obtuse 
termination as in Stratodus. The vomer in one of the species is acumi- 
nate at one end, and supports a short series of teeth, the middle portion 
ina double row. All the teeth are without pulp-cavity. 
The only indication of the mode of succession of the teeth is furnished 
by the specimen of C. anceps. Here a small excavation appears on the 
ting edge, and a less extended posterior 
