GEOLOGICAL SUEVEY OF THE TEEEITOEIES. bdo 



A vertebra before me has tlie longitudinal liypopophysial keel of that 

 group, which termiaates m a very obtuse poiut. The ball looks exten- 

 sively upward. The upper articular extremity of the parapophysis is 

 short and obtuse, and the inferior equally so, and directed shortly down- 

 ward, their articular faces being continuous with each other. It sends 

 an obtuse latero-inferior keel backward, which terminates in front of 

 the ball. The angle connecting the diapophysis and z3"gapophyses is 

 strong, while the former was narrow ; in the specimens it is broken. 



Measurements. 



IT. 



Length of centrum with hall, (helow) 0090 



Elevation behind, (total) • 0135 



Elevation before, (total) - 0110 



Width bet vreen parapopliyses below 0055 



Width of articular cup 0054 



]-)epth of articular cup 0043 



Depth of inferior keel 0020 



From the Bad Lauds of Cottonwood Creek. 

 This species is allied to the Boavus of Marsh. 



BATEACHIA. 



The vertebral column and part of the cranium of a probably incom- 

 pletely developed tailless Batrachian were procured by Dr. F. V. 

 Hayden, from the fish-shales of the Green Eiver epoch, frc^.n near Green 

 Eiver City, Wyoming. They are not sufficiently characteristic to enable 

 me to determine the relation of the species to known forms, and it is 

 the oldest of the order yet discovered, the fossil remains of the known 

 extinct species having been derived from the Miocene and later forma- 

 tions. 



PISCES. 

 CLASTES, Cope. ' 



Order Ginglymodi : Mandibular ramus without or with reduced fissure 

 of the dental foramen, and without the groove continuous with it in 

 Lepidosteus. One series of large teeth, with small ones exterior to 

 them in the dentary bone, the inner superior aspect of that bone with- 

 out prominent dentiferous or rugose rib. 



The species of this genus resemble in many ways the Lepidosiei of the 

 present day. Their scales are rhombic and pierced by a duct on the 

 lateral line. The cranial bones are ornamented by tubercles of ganoiue, 

 distributed variously according to the species. Some of these fishes 

 reached a large size, exceeding any now living ; others resembled the 

 true Lejpidostei in this respect. 



The characters assigned to this genus are derived from the under 

 jaw, and I have observed it in two species, one which I suppose to be 

 the Lepidosteus glaher, Marsh, and the other C. cycUfencs, Cope. 



Olastes anax, Cope, spec. nov. 



Eepresented by some cranial bones, and especially by a posttemporal, 

 which indicate a very large species of gar, two or three times as large 

 as the alligator-gar of the Mississippi, {Atractosteus ferox.) The bone 

 has a free ovate posterior outline, and its superior surface is covered 



