1897.] NEW PALEOZOIC VERTEBRATA. 87 



rior surface is visible. The interclavicle displays a low median 

 longitudinal keel upwards. 



The tympanic notch of the skull is feeble if present ; it is quite 

 possibly absent, as in the genus Acheloma. The muzzle is broadly 

 rounded. The orbits are rather large, and the posterior borders 

 fall a little behind the line which divides the length of the skull 

 into two equal parts. The frontal is excluded from the supraorbital 

 border by the large postfrontal. The postorbital is a longitudinal 

 oval, acuminating to a point posteriorly. The cranial bones are 

 honeycombed with fossae, which are considerably wider than the 

 diameter of the intervening ridges. The fossae are generally elon- 

 gate in a direction radial from the centre of the bone to which 

 they belong. There is a long tooth near the extremity of the den- 

 tary bone. ^Most of the remaining teeth are concealed, but some 

 very small ones on the premaxillary and maxillary bones are visible, 

 and parts of some larger maxillary teeth appear below the posterior 

 part of the orbit. The bases of the teeth are coarsely incised 

 grooved, /. e., the surface is inflected. 



The legs are robust and the digits rather slender. The only 

 ungual phalange preserved is slender, acute, and slightly curved, 

 like that of many lizards. The humerus is robust and considerably 

 expanded at the extremities. The ulna and radius are of usual pro- 

 portions, and about three-fifths the length of the humerus. The 

 metacarpals and phalanges are slender. No osseous carpus. Four 

 digits are preserved ; whether there is another cannot be ascer- 

 tained. The ribs are long, rather slender, and not alate. 



Measurements. mm. 



Length of skull to occipital condyles 46 



" '' " *' " table, posterior border. 35 



Width '' ^' at angles of mandible '^d 



Length '' *' from posterior border to orbit (axial) 26 



"■ " orbit 15 



Width '' '' II 



"■ "■ interorbital space 17 



Length *' long mandibular tooth 6 



Width " interclavicle above 23 



^'' *' clavicle above (greatest) 19 



Five abdominal scales in oblique line 10 



Length of humerus 20 



