CHAPTER XIV. 



THE MICROSAURIAN FAMILY TUDITANID^E, FROM THE COAL MEASURES 

 OF OHIO AND PENNSYLVANIA. 



FamUy TUDITANID.S Cope, 1875. 



Cope, Geol. Surv. Ohio, 11, pt. 11, p. 357, 1875. 



Lizard-like microsaurians; franial elements strongly sculptured with pits or 

 grooves or almost smooth, wdth weak punctulations. Orbits usually well forward; 

 squamosal sometimes excluded from the parietal ; skull hornless ; teeth pleurodont, 

 conical and sharp, smooth or slightly plicate ; clavicle of a triangular shape, which 

 is characteristic of all the species ; vertebrae well developed and phyllospondylous, 

 the osseous portion being merely a hollow cylinder, hour-glass-shaped ; ribs curved, 

 long, attenuated and intercentral ; digits clawed; ventral armature absent in all 

 but a single species and the association of the species is doubtful; tail moderate 

 in length. Three genera with 13 species included in the family. These species are : 



Tuditanus punctulatus Cope, Linton, Ohio. 

 brevirostris Cope, Linton, Ohio. 

 longipes Cope, Linton, Ohio. 

 minimus Moodie, Cannelton, Pennsylvania. 

 walcotti Moodie, Linton, Ohio. 

 Erpetosaurus radiatus Cope, Linton, Ohio. 

 obtusus Cope, Linton, Ohio. 

 tabulatus Cope, Linton, Ohio. 

 minutus Moodie, Cannelton, Pennsylvania. 

 sculptilis Moodie, Cannelton, Pennsylvania. 

 acutirostris Moodie, Linton, Ohio. 

 tuberculatus Moodie, Linton, Ohio. 

 Odonterpeton triangularis Moodie, Linton, Ohio. 



The association of these species in the one family is provisional and will need 

 revision on the acquisition of new and more complete material. 



Genus TUDITANUS Cope, 1874. 



Cope, Trans. Amer. Phil. Soc, xv, p. 271, 1874. 

 Cope, Geol. Surv. Ohio, n, pt. n, pp. 391, 1875. 



Type: Tuditanus punctulatus Cope. 



The genus as here defined is a somewhat composite group and it is quite proba- 

 ble that some of the species here included will have to be removed to another genus 

 when the anatomy of the forms is better known. The species of the genus are all 

 moderately small, the largest barely attaining a length of 8 inches. 



There are 5 species of Tuditanus thus far known. All of the species are charac- 

 terized by the possession of a peculiar triangular-shaped clavicle with radiating 

 grooves, and this has been taken as one of the distinctive characters of the genus, as 

 well as of the family. The structure of the cranium where known is quite uniform 



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