I06 THE COAL MEASURES AMPHIBIA OF NORTH AMERICA. 



maxilla is excluded from the orbit and is an elongate element with sharp conical 

 teeth, of which there are 4 preserved. These measure about i mm. in length. The 

 jugal lies along the lateral border of the orbit and it is acuminate both anteriorly 

 and posteriorly. It borders the supratemporal broadly. The postfrontal forms the 

 greater part of the posterior boundary of the orbit. It is triangular and acuminate 

 behind, and is bordered broadly by the parietal and supratemporal. The supratem- 

 poral is also triangular and it borders the parietal broadly. The squamosal is evi- 

 dently the largest element in the skull and on its posterior comer there is a flake of 

 bone which may represent the quadrate, though this is by no means certain. The 

 quadrate has not been detected in any of the Carboniferous Microsauria so far 

 studied. The tabulare is an elongate element in the transverse line of the skull. 

 Its entire boundary is uncertain, though part of the sutures are present. The 

 quadratojugal is elongate and lies posterior to the maxilla and with that element 

 forms the lateral boundary of the skull. 



The canals of the lateral-line system have not been detected on the skull. The 

 sculpturing of the cranial elements consists of grooves and ridges which radiate from 

 a center. They are more prominent on the parietals than elsewhere, although the 

 other skull elements present a strong sculpturing. 



There are also preserved on the slab of slate, about 10 mm. posterior to the skull, 

 fragments of the pectoral plates, probably representing the clavicles and the inter- 

 clavicle. They are so badly fractured that their form can not be determined. No 

 limbs or vertebrae have been observed. 



Measurements of the Type of Erpetosaurus sculptilis Moodie. 



mm. mm. 



Length of skull in median line 20 Interorbital space 4 



Width of skull at posterior border (estimated) 24 Diameter of nostril — i 



Diameter of orbit 3 Pineal foramen, diameter .50 



Length of orbit 4 



Pectoral Girdle Provisionally Associated with Erpetosaurus sculptilis Moodie. 

 Moodie, Proc. U. S. Nat. Mus., 37, p. 22, 1909. 



The present specimen is preserved on a block of slate from Cannelton, Pennsyl- 

 vania. It is associated with the previously described Erpetosaurus sculptilis Moodie 

 on account of its size, the geological and geographical distribution, and the charac- 

 ter of the sculpture. It may pertain to an unknown species. Other remains besides 

 the 3 elements of the pectoral girdle are preserved on the block of slate, but they 

 are, for the most part, too imperfectly preserved for recognition. Some of them are 

 phalanges, and I believe I detect a scapula in the rounded curved plate lying near 

 the right clavicle. The 3 pectoral elements, the interclavicle and the 2 clavicles, are 

 preserved intact, with the ventral surface uppermost. 



The specimen is particularly important in that it furnishes further evidence of the 

 simplicity of the microsaurian pectoral girdle, which Jaekel regarded (347) as being 

 extremely complex, in one species at least, Diceratosaurus punctolineatus Cope. 

 The 3 elements are broken, but either the elements or their impressions are pres- 

 ent, so that identification is possible. The elements are scvilptured with radial- 



