THE MICROSAURIAN FAMILY TUDITANID^. 89 



The vertebral column is represented by a line which Cope suggests (123) may 

 be the chorda dorsalis (notochord). Osseous vertebrae were probably present, but 

 their nature is obscured by the carbonaceous matter covering them. 



The ribs as preserved are long and curved. They are slender and attenuated at 

 the distal ends. They were probably single-headed, but whether their articulation 

 was intercentral or not can not be determined. 



The other specimens which are referred to this species show nothing of impor- 

 tance in the way of structure. They consist for the most part of fragments which 

 may or may not represent the species. 



The species differs from the type of the genus (T. punctulatus] in the possession 

 of a broadly rounded muzzle. This character will also separate it from other spe- 

 cies of the genus. The sculpturing of the bones of the cranium is coarser in the pres- 

 ent species than in the type. The form of the clavicle is different in the two species. 

 The above-described species seems to be more closely allied to the form described 

 as Tuditanus walcotti than to other species of the genus. I have been unable to 

 detect the presence of limbs, although Cope says they are present. 



MEASUREMENTS OF THE TYPE OF TUDITANUS BREVIROSTRIS COPE. 



mm. mm. 



Median length of skull 15 Interorbital space 4.5 



Width of skull at posterior border 18 Length of clavicle 7 



Width of skull across orbits. . ...11.5 Width of clavicle .... 3 



Length of orbit ... 3 Length of longest rib preserved .. 9 



Width of orbit 2 Length of entire specimen 54 



The material consists of the type specimen with counterpart and two fragments 

 which probably are to be associated with this species. Collected by Doctor J. S. 



Newberry. 



Tuditanus longipes Cope. 



COPE, Trans. Amer. Phil. Soc., xv, p. 210, 1874 (Sauropleura). 

 Cope, Geol. Surv. Ohio, n, pt. ll, 398, pi. xxvi, fig. 2, 1875. 



Type: Specimen No. 1099 G, American Museum of Natural History. 



Horizon and locality: Linton, Ohio, Coal Measures. 



The cranium of this species is quite unknown. The only genus with which the 

 specimen can be compared in the structure of the skeleton is Tuditanus. From the 

 other species of the genus the present form differs in the presence of ventral chevron 

 rods and the elongate character of the limbs, as well as in the possession of large 

 iliac bones, which, in the only other species in which the ilia are known, are small 

 and slender. It seems best to locate the species in this genus for the present, 

 although it may eventually have to be removed to another group. Very little is 

 known of the main portion of the skeleton of the species of Tuditanus, other than in 

 T. longipes, so an exact comparison is impossible. From all the species of Tuditanus 

 thus far known the present species differs in the elongate character of the limbs and 

 in the presence of ventral scutellation. There are three other species of Tuditanus 

 in which the limbs are known. These are: T. walcotti Moodie, T. minimus Moodie, 

 and T. punctulatus Cope. In these three species the limbs are short and weakly 

 developed. From the other species of Tuditanus the present species maybe separated 

 by its size principally, since nothing of the bodies of the other species is known. 



