THE MICROSAURIAN FAMILY TUDITANID^. 91 



dence of osseous material in its place. There is but one phalangeal bone preserved, 

 and, since this is displaced with reference to the ulna and radius, its position can 

 not be determined. It may have been a metacarpal. It is short and expanded at 

 the ends. 



The hind limbs are represented by the two femora and the upper portion of the 

 tibia. The femur is almost as elongate as the humerus and is more slender. It is 

 not so much expanded as the humerus. Its ends appear to have been cartilaginous 

 and do not represent the well-formed articular surfaces preserved in the T. minimus. 

 The upper part of the tibia is preserved, and appears to have been truncate. 



If this species belongs with Tuditanus it is of interest in that the ventral chev- 

 rons are present. The species is particularly characterized by the elongate limbs. 



MEASUREMENTS OF THE TYPE OF TUDITANUS LONGIPES COPE. 



mm. mm. 



Length of vertebral column between pelvis and end Length of radius and ulna 12 



of humerus 70 Length of a vertebra 3 



Length of vertebral column anterior to humerus 18 Length of ilium 7 



Length of caudals present 42 Length of femur, estimated 18 



Length of humerus 19 7 chevrons in 4 mm. 



Width of humerus 2 



Tuditanus minimus Moodie. 



MOODIE, Jour. Geol., xvn, No. I, p. 56, fig. 10, 1909. 

 MOODIE, Proc. U. S. Nat. Mus., 37, p. 23, pi. 8, fig. 2, 1909. 



Type: Specimen No. 4555, U. S. National Museum. 



Horizon and locality: Cannelton slates of Pennsylvania (Upper Freeport). 



The species is represented by a nearly complete skeleton preserved on a slab of 

 slate from the Cannelton shales of Pennsylvania. The obverse slab has been lost, 

 which is very unfortunate, since there is no doubt that the entire skeleton was origi- 

 nally present. The species is placed in the genus Tuditanus on account of the close 

 resemblance to the type form T. punctulatus Cope, although it is much smaller than 

 that species. 



The type specimen of the species did not attain a length of more than 3.5 inches. 

 Its form is very lizard-like, but its structure is typically amphibian. The form of 

 the skull is especially similar to that of the type species T. punctTilatus, which it 

 resembles in the narrow posterior truncation of the skull, as well as in the anterior 

 position of the orbits. 



The skull is in the form of a narrow oval, sharply narrowed posteriorly and trun- 

 cate. The orbits are located well forward and their posterior border lies in front of 

 the line dividing the skull transversely into equal parts. The interorbital space is 

 greater than the diameter of the orbit. Impressions of teeth are preserved on the 

 premaxilL'c and maxillae; there are 8 of them in a distance of 3 mm. The teeth 

 appear to be mere blunt denticles and were possibly pleurodont. 



The elements of the cranium are very poorly preserved. It has been impossible 

 to determine all of the sutures. The bones of the premaxillary region have been 

 destroyed, but the arrangement of them was probably not far different from that 

 which obtains in other members of the genus. The posterior boundaries of the nasals 



