1897.] NEW PALEOZOIC VERTEBRATA. 85 



Ceraterpeton tenuicorne Cope, Report of the Geological Survey 

 of Ohio, *'II. Paleontology," 1874, p. 372, PL XLII, Fig. 2 

 (by error on plate C. recticorne). 



PL III, Fig. 2. 



A partially preserved specimen of this species occurs in Mr. 

 Lacoe's collection. It includes not only the head but the vertebral 

 column as far as the caudal series exclusive, in bad preservation ; 

 part of the thoracic buckler and the greater part of the right hind 

 leg and foot. As this species has been thus far known from a skull 

 only, this specimen is very useful. 



The^late is so split that the greater part of the surface of the 

 skull is concealed in one of the slabs. On one of them, however, 

 the presence of rows of fossae is evident on the dentary and 

 squamosal bones. The latter are convex outwards as in the type. 

 The horns are placed wide apart and differ from those of the type in 

 being a little incurved to the acute apex. The lateral pectoral shield 

 exhibits a sculpture of radiating lines of small fossae. There are 

 small equal teeth on the premaxillary bone. The orbits are in the 

 anterior half of the skull, and the nostrils and pineal foramen are 

 distinct. The posterior foot is nearly equal in length to the leg, 

 and the slender digits are four and probably five in number. 



The accompanying measurements give a good idea of the pro- 

 portions of this species. 



Measurements. mm^ 



Length of head to occiput, about 16 



Greatest width of head 20 



Length of horn from base 7- 



^* " skull to line connecting posterior border 



of orbits 8 



*' orbit 3 



Interorbital width 3.5: 



Length of vertebral column to femur ^^ 



" '' femur 5.5, 



" " lower leg 3 



'' '' second digit (not complete) 7 



" '^ metatarsal of do 2- 



" '^ phalange i *' i.5 



** " phalange ii ^' 1.5 



PROG. AMEE. PHILOS. SOC. XXXVI. 154. G. PRINTED MAY 18, 1897. 



