340 PROCEEDINGS OP THE ACADEMY OF 



ON SOME NEW BATRACHIA AND FISHES FROM THE COAL MEASURES 



OF LINTON, OHIO. 



BY E. D. COPE, A.M. 



The following descriptions of some interesting forms are pub- 

 lished by permission of Prof. John S. Newberry, who procured the 

 specimens in the course of the geological surve3r of Ohio, of which 

 he is director. 



LEPTOPHRACTUS, Cope, gen. nov. 



Established on various portions of the cranium of a large Ba- 

 trachian allied to the Labyrinthodontia. The top of the head is 

 covered with angular plates or scuta arranged in the following 

 manner on tlie region preserved. Two symmetrical scuta occupy 

 the median line, one in front of the other. One of these is a 

 longish or coffin-shaped hexagonal, with the suture with the other 

 concave. The latter is more ovoid, broad and couA^ex next the 

 first mentioned, and somewhat more contracted at the opposite 

 extremity. Beyond this are two shields joining by a straight 

 suttire on the middle line ; besides this one, they have two con- 

 cave sutures for scuta, at the fartlier end two concave lateral 

 sutures, and a straight one to the adjoining median scutum, whose 

 suture is also concave. On each side of this median plate is a 

 large area surrounded before, outwards, and behind by smaller 

 scuta, three in front, two at the side, and two behind. Commenc- 

 ing with the first. No. 1 has been already described ; No. 2 is small, 

 oval, and antero-posterior ; No. 3 is an antero-posterior pentagon 

 with the narrowest side inwards; No. 4 is a similar transverse 

 pentagon ; No. 5 is an antero-posterior pentagon which presents its 

 shorter lateral facet inwards; No. G has a similar character, but is 

 smaller and with more definite angles. Another series of scuta is 

 seen outside of these at one end of the series. Three of this set 

 bound tlie front and side of each of the median pair above men- 

 tioned, leaving a short facet next its fellow unaccounted for. 



The sculi)ture consists of radiating ridges and tubercles which 

 are most broken near the centres of the scuta. 



The teeth are rather distantl}' grooved for some distance above 

 the base. They arc of different sizes; the smaller are compressed 

 and with fore and aft cutting edges. 



