EXTINCT BATRACHIA. 399 



abdominal armature of slender rods, in chevrons with anterior angle, 

 shows that it belongs to the usual type of the Coal Measures. 



Body long, slender, with long neck and long tail. Ribs nineteen or 

 twenty -one, moderately curved, the anterior stouter and with widened 

 extremities, the posterior more slender and drawn out to a fine point. 

 Dorsal vertebrae one and a half times as long as wide, with well-developed 

 neural spines. These are rather narrower than high, the height about 

 equaling the length of the centrum. They are rugose, with small tuber- 

 cles, which are sometimes confluent into ridges. 



The humerus is longer than the ulna and radius, which are of equal 

 lengths — that is, about as long as four dorsal vertebrae. The ulna and 

 radius are not widely separated, and expand at the carpal region. The 

 humerus is rather more slender, and is distally expanded. The digits 

 are not all preserved. One metacarpal is seen at an interval beyond the 

 fore- arm, and a series of phalanges extends beyond the metacarpal. The 

 latter is about half as long as the fore-arm, and a little longer than the 

 first phalanx, which is, like the former, very slender. Parts of two or 

 three phalanges of perhaps other digits appear alongside, as though 

 turned backwards. The femur is about as long as the humerus, equal- 

 ing six and three-quarter posterior dorsal vertebrae. Proximally it is 

 enlarged gradually, and terminat' s regularly, so far as can be seen, as it 

 is partially concealed beneath the distal extremity of the ilium. 



Length of vertebral column between pelvis and humerus, 0.070 m. ; 

 length in front of humerus, .0235; length of caudal series preserved, 

 .070; length of humerus, about .0185; length of ulna and radius, .012; 

 length of part of fore limb in line, .0455 ; length of ilium, .007 ; length 

 of femur, .020; number of chevron rods in .004, seven. 



A single specimen of this Batrachian was obtained by Prof. Newberry 

 at Linton. It is in a good state of preservation. 



Leptophractus, Cope. 



Proceedings Acad. Nat. Sci., Philad., 1873, p. 340. 



Established on various portions of the cranium of a large Batrachian 

 allied to the Labyrinthodontia. The only parts which can with cer- 

 tainty be referred to it are the jaws of three specimens which include only 

 the anterior parts. These bear large teeth, round in section at the base, 

 but with compressed acute apex, with a cutting edge on the anterior 

 face, the enamel delicately grooved, as external indication of the laby- 



