GEOLOGICAL SUKVF.Y OF THE TEliRITOKIES. G35 



rArPICIITIIYS PLICATUS, CopO, SpCC. IIOV. 



EstablisluHl on n serios of bones of tlio slcull ;iiul voitobra'. Tlio cranial 

 bones are deeply grooved, and with parallel ridges between. The onter 

 face of the dentaryis ronghly grooved on the inferior half of its ])osteri(-n' 

 two-thirds. The inner face is marked by a strong- groove near its middle 

 to the symphysis, above whieh it is very convex : below it extends (o a 

 thill edge. The dental alveoli are shallow and in close contact; there 

 are six ni .025"' at its middle, where it is also .01!) deep. The teeth be- 

 come smaller at the symphysis. The maxillary bone is rod-like proxi- 

 mally, bnt flattens out much distally, and is there slightly rngose on the 

 outer face. The teeth are smaller than the mandibnlars, there being 

 at the mitldle fonrteen in .OlT*'". The alveoli are larger proximally. The 

 depth of the bone at the beginning of the sntnrt^ lor the sui)i)lementai'y 

 maxillary is .020"'. The su{)erit)r extremity of the hyomandibnlar is 

 broad and flat. The inferior qnadrate is thickened behind, and has a 

 sublongitndinal condyle distally. The squamosal suture of the ptery- 

 goid adjoins it. 



Number cranial ridges in .010'", 10. The vertebrae preserved are 

 quite short, and have sessile diapoi)liyses ; they are broader than deep. 

 Width, .020'"; depth, .010; thickness', .005. The articular surfjices for 

 the neural arches are confluent, so as to have a subquadrate outline. 



Another specimen is represented by numerous fragments. One of 

 these is the proxinml half of the os maxiUnrc. This extremity rises in a 

 curve, is somewhat depressed, and is excavated below. The inner face 

 is very convex, the outer flatter and with squamosal suture for premax- 

 illary external to the extremity a half inch. A fragmentof the palatine 

 exhibits a series of large marginal teeth and a plate of smaller ones 

 within them, thus resembling Anna ; the superior face exhibits a deej) 

 longitudinal groove, which opens out posteriorly. The prooticbone is a 

 half disk, thickened on the straightedge, and with concave sides, with a 

 flat tuberosity on one of them. On some of the cranial bones the ridges 

 are interrupted. The dorsal vertebne of this specimen have the centra 

 broader than deep, and Avith projecting diapophyses. The neural ar- 

 ticular faces are for its own arcli and that of the next vertebra, and there 

 are two narrow grooves on the inferior face. They are nearly or quite 

 distinct. As this is observed on vertebr;^ with elongate diapophyses, 

 and they are confluent, or one is wanting on those with sessile diapo]ihy- 

 ses, it is probable that the position of the neural arches is shifted on 

 the dorsals, an arch being confined to a single centrum on the posterior 

 ones, as occurs on the caudals only in Amia calra. 



The specimens came from distinct localities on Cottonwood Creek. 



Pappichthys sclekops. Cope, sp. nov. 



Established on a ramus of the mandible of one, and other similar 

 specimens of other individuals. These indicate a large ftsh, erpiul 

 in size to the alligator-gar of the Mississippi. The dentary bone is 

 more compressed and deeper than in 1*. plicatn^. The longitudinal 

 groove runs above the middle line, and the portion of the bone below 

 it thins to an edge. The upper ])ortion is thickened, and the alveolar 

 border is wide and bounded by an angle on the inner side. The alveoli 

 are large and shallow} in .025'" scarcely three find place. Kcar 

 the symphysis is a smaller one, which is sepaiated by a considerable 

 diastema from the succeeding one, (perhai'sabnonually.) The external 

 lace of the bone is rough and somewiiat tubercular. 



