22 



AMPHIBIA AND PISCES OF THE PERMIAN OF NORTH AMERICA 



Diplocaulus copei Broili. 

 Broili, Paleontographica, vol. li, 1904, p. 21. 



Type: This species was founded on a series of imperfect specimens, of which 

 there are three (Nos. 44, 45, and 47, xv, 1901), with vertebrae attached, on 

 a single plate. They are all from Texas, north of Seymour, in Wilbarger 

 County, and are preserved in the Museum of the Alte Akademie, Munich. 



Original description (abstracted from Broili) : The skulls have all suffered 

 from pressure, so that it is impossible to give a complete description of any 

 one; the account furnished by Broili is taken from all. The outline of the skull 

 is crescentic and the posterior prolongations are turned somewhat towards 

 each other, so that the posterior line of the skull is sharply concave. The 

 position of the orbits and nares and the character of the sculpture are as in 

 D. magnicornis. The sutures do not show even in a specimen which has lost 

 the rough outer layer of the bone. The under surface of the skull can not 

 be described in detail, because it is obscured by the pressure to which the 

 specimens have been subjected, but it is, in all essentials, like that of D. mag- 

 nicornis. Only the slightly concave occipitalia lateralia, the posterior ends of 

 the pterygoids, and the parasphenoid can be made out, and these are as in 

 D. magnicornis. The lower jaw reaches a length equal to one-third of that 

 of the skull. 



Measurements of four skulls are given as follows in centimeters: 



I. 



II. 



III. 



IV. 



Total lenpth from tip of horn to middle of premaxillary region. 



Length of skull in middle line 



Space between tips of horns 



Distance from tip of a horn to middle of supraoccipital region . 



Distance of orbits from posterior border of skull 



Interorbital space 



Width of orbits 



Width of skull across orbits 



Breadth of skull near posterior border of palatal vacuities. . . . 

 Breadth of skull across occipital condyles 



I9-S 



9.8 



20.4 



12.2 



14. 1 

 16.2 



18.8 



9.6 



18.4 



12. 1 



6.9 



1.8 



I.I 



10.2 



14.2 



16.2 

 9-3 



IS-S 

 9.0 



6.S 

 1-4 

 I.I 

 9.2 



12. s 



The vertebrae, ribs, and fragments of the clavicles and interclavicle 

 show no great difference from D. magnicornis. 



Broili makes the final statement that this species differs from D. magni- 

 cornis in the more compressed and smaller body and in the curvature of the 

 horns which bend in towards each other, while those of D. magnicornis 

 extend more directly outwards. 



Revised description: It is impossible to distinguish this species from D. 

 limbatus except by the smaller size, which can not be trustworthy. Of two 

 figures given by Broili (5), plate iii, fig. i has the characters of D. magni- 

 cornis and fig. 2 the characters of D. limbatus. The species is indeterminate. 



Diplocaulus (?) pusillus Broili. 



Broili, Paleontographica, Ed. li, 1094, p. 24. 

 Williston, Trans. Kans. Acad. Sc, 1909, p. 122. 



Type: A small skull with a few attached vertebrae. No. 65, xv, 1901. 

 Museum of the Alte Akademie, Munich. From Wilbarger County, Texas. 



Original description : Broili believed at first that this was the skull of a 

 young Diplocaulus, but the completely ossified skull and the presence of 



