58 Bulletm American Museum of Natural History. [Vol. XIX, 



number of about 50. Looniis states that there are about 44 

 teeth. The maxilla which he figures in outline {op. cit., p. 

 45) is slenderer than the one here figured and of a some- 

 what different form. Loomis also figures what he regards 

 as the mandible of this species. 



In No. 1743 there is a deep excavation in the sides of the 

 skull just below the articulation of the hyomandibular. This 

 is seen also in the skull of Portheus, and is probably found in 

 the skulls of all members of the family. The supraoccipital 

 and the epiotic have been broken from the skull and replaced, 

 as shown. Just above the line of fracture is the very distinct 

 suture which passes between this bone and the squamosal. 

 Another suture starts well up on the front of the supraoccip- 

 ital crest, descends for a short distance, then turns back- 

 ward. The bone in front of and below it is undoubtedly the 

 unpaired parietal. Cope mistook the epiotic for the parietal. 

 The suture in front of and below the parietal is effaced by the 

 fracture. I have not been able to find a suture separating 

 the parietal from the epiotic, but such no doubt exists. 

 In a former paper (Zool. Bull., II, 1898, pp. 25-54) I have 

 announced such to be the position of the single parietal; but 

 its bounding sutures are not often easily seen. One speci- 

 men will reveal one suture, another specimen another suture. 

 In a specimen of Portheus, No. 2373 of this Museum, both 

 the upper and the lower sutures are distinct. Such a dis- 

 position of the parietals doubtless characterizes all members 

 of the family. 



The palatine has been provided with a patch of small teeth. 

 The malleolus for union with the maxilla is low, broad, and 

 flat. 



The interorbital septum of the species under consideration 

 appears to be occupied by a presphenoid; and above this 

 there were probably orbitosphenoids. The vomer is beset by 

 a patch of teeth. 



As has been stated by Cope, the scapula and part of the 

 cleithrum are present. This author states that the width of 

 the cleithrum ("clavicle ") below the scapula is 40 mm. This 

 shows that he mistook the upper for the lower end of the 



