1885.] 407 [Cope. 



The cranium is distinguished by its elongation, the outline of the muz- 

 zle being a regular oval. The orbits are situated at about the middle of 

 the length of the skull. A transverse line dividing the skull equally 

 marks the anterior two fifths of the orbit. This proportion distinguishes 

 the species from the C. tenuicorne,* where the orbit is entirely within the 

 anterior half of the skull. The horns are rather short, and are straight 

 and acute. The lateral border of the skull contracts somewhat to their 

 base on each side. They diverge at an angle of about 45° from the 

 median axis of the skull. The orbits are oval, the transverse being .75 

 the longitudinal diameter, which is in turn about equal to the interorbi- 

 tal width. The nasal bones are very large, forming the upper surface of 

 the muzzle, and are not distinguishable from the prefrontals, so as appar- 

 ently to enter by their postero-external angle, into the orbit. Their sculp- 

 ture consist of sparse thin radiating ridges, which originate near the cen- 

 ter of each bone. The frontal bones are rather wide. Their sculpture 

 consists of radiating ridges, which are not very close together, and which 

 originate at a point near the supraorbital border, a little in front of a line 

 which connects the middles of the orbits. On the postfrontal bone the 

 radii run posteriorly. On the parietal they inosculate so as to form coarse 

 fossae. The teeth are rather small, and their sections at the middle and 

 upwards, are round. 



Measurements. M. 



Total length skull on middle line 053 



Length to line of anterior orbital border 023 



Width at middle of orbit (with lower jaw) 044 



Width at base of horns 040 



Interorbital width 017 



Length of horn from base 0075 



Should it turn out that the Tuditanus obtusus of the same locality and 

 horizon is founded on a Ceraterpeton which has lost its horns, it may still 

 be distinguished from the present animal by the more anterior position of 

 its orbits. These are so placed that their posterior border is crossed by tlie 

 transverse median line. 



Discovered by Samuel Huston. 



Claspers of Batrachia. Dr. Anton Fritsch has obtained in the Gas- 

 kohle of Bohemia, in connection with specimens of two species of Ophi- 

 derpeton, bodies which he believes to belong to the external genitalia. 

 They consist of a curved rod terminating in a secund expansion, whose 

 projecting edge is divided into fine teeth like a comb. Mr. Samuel Huston 

 has obtained at Linton, in Eastern Ohio, at the locality which has furnished 

 the species here described, a similar body, It differs from those described 

 by Fritsch, in the greater curvature of the shaft in the direction to which 

 the teeth present. Its axis is nearly at right angles to that of the body of 



* Report of the Geological Survey of Ohio, Palaeontology il, p. 372, PI. xlii, 

 fig. 2. 



