THE MICROSAURIAN FAMILY TUDITANID^. 



87 



of the skull between the orbits. The parietal is apparently the largest element of the 

 cranial roof and the pineal foramen is located in the anterior fourth of the median 

 suture separating the parietal elements. The form of the postparietal and the tabu- 

 lare can not be determined, as the greater part of this region is lacking. The squa- 

 mosal seems to be located well forward and is rather small, but has the usual rela- 

 tion of this element. Only fragments of the other ele- 

 ments remain and nothing can be said of their form. 

 The mandibles of both sides are represented by depres- 

 sions, and they are ornamented with longitudinal grooves 

 and ridges. The teeth are not preserved, but there are 

 evidences of the maxillary teeth. These are minute and 

 sharply conical. Just posterior to the skull there is pre- 

 served the impression of a short, round rod which is 

 not definitely determined. It may be an element of the 

 hyoid apparatus, although it is rather stout for such. It 

 does not have the relations indicated by Cope in his 

 figure (123, pi. xxxiv, fig. i). 



There are three elements of the pectoral girdle pre- 

 served. These undoubtedly represent the interclavicle 

 and the clavicles. The interclavicle is rhomboid in shape 

 and is attenuated posteriorly. The attenuation is ab- 

 ruptly truncate posteriorly and it is thus of quite a dif- 

 ferent character from the acutely pointed interclavicle 

 of T. minimus. The clavicle has a somewhat semicir- 

 cular form, but is not attenuated at either end. It seems 

 to be uniformly broad. 



The forearm of the right side is preserved in part. 

 The humerus is seen to be a heavy, somewhat expanded 

 element lying displaced with relation to the pectoral 

 girdle. It is greatly expanded at the ends. The ulna 

 presents characters similar to the humerus and only dif- 

 fers from it in being shorter and less stout. The radius 

 is not preserved. The carpus is unossified and its posi- 

 tion is occupied by a blank space. The digits are repre- 

 sented by 4 metacarpals, and this may have constituted 

 the entire number of the fingers. The phalangeal bones 

 preserved are a little scattered. They are elongate with 

 expanded ends. 



Evidences of 23 consecutive osseous vertebrae are 

 preserved. Their character can not be determined, al- 

 though Cope (123) describes them as amphicoelous. This may be inferred to be the 

 case, but I am unable to verify his observation. In form the vertebrae are subquad- 

 rate. The neural spines are not evident. The osseous ribs articulate, apparently, 

 between the bodies of the vertebrae. Cope figured them as intercentral. There are 22 



Fig. 19. — Drawing of skull and skele- 

 tal elements of Tudilanus punctu- 

 latus Cope from the Coal Meas- 

 ures of Linton, Ohio. X 1 .5. fr, 

 frontal ; ic, interclavicle ; cl, clav- 

 icle; h, humerus; ph, phalanges; 

 par, parietal; pp, postparietal; 

 lab, tabulare, supratemporal and 

 squamosal; u, ulna; r, radius. 



