Cope.] 4:5 J [Xov. 15, 



the side of the ueurapophysis, an aliform crest downwards and forwards 

 to the side of the anterior articular face of the centrum below the prezyg- 

 apophysis. The neural arch forms a low roof, and judging from the base, 

 the neural spine is not large. The small size of the vertebrae renders it 

 highly probable that they belong to another individual which the animal 

 had taken into its mouth. 



Measurements. mm. 



Total length cranium above 55 



"Width cranium posteriorly 34 



" " at middle of muzzle 23 



' ' interorbital space 9 



Length from end of muzzle to mouth border 21 



" " moulh border to quadrate cotylus 30 



Depth of mandibular ramus at symphysis 2 



" " " middle 3.5 



Anteroposterior diameter of nostril 8 



Width of internarial space 5 



Length of basis of three mandibular teeth 4 



Length of crown of second mandibular tooth 3 



" three anterior vertebrae 7 



" anterior vertebra 2.5 



Width of " " 2.5 



From the Permian bed of Texas. 



SUPPLEMENT. 

 Some New Batrachia from the Permian Bed op Texas. 

 Zatrachts microphthalmus, sp. nov. 



Represented by an entire skull covered with a thin layer of bean ore, 

 and a second and larger skull without lower jaw and with the extremity 

 of the muzzle broken off. The second specimen displays the characters 

 of the base of the skull, and in other respects better displays the specific 

 characters. 



The attenuation of the bones of the skull exhibited by the Z. serratus 

 is present in this species also. The interorbital and preinterorbital regions 

 are strongly concave, and there are strong preorbital fossa;. The tabular 

 angles are very prominent, forming rudimentary horns, and there is a 

 prominent angle projecting from tlie posterior quadrate region. What 

 especially characterizes tliis species is the small size of the orbits. These 

 are about half the diameter of those of a Z. serratus of the same size, and 

 are half the diameter of the space between their posterior border and that 

 of the cranium at the middle line, and enter the interorbital width 2.5 

 times. The posterior border of the orbit marks the fourth fifth of the 

 length from the end of the muzzle to the middle supraoccipital border. 

 The muzzle narrows rapidly anteriorly, presenting an elliptic outline, and 

 is much depressed. 



