1902.] NATURAL SCIENCES OF PHILADELPHIA. 383 



DESCRIPTIONS OF TWO SPECIES OF EXTINCT TORTOISES, ONE NEW. 



BY O. P. HAY. 



Testudo atascosae sp. uov. 



^ In the collection of the Academy of Natural Sciences of Phila- 

 delphia the writer has found certain bones Avhich belong apparently 

 to an undescribed species of the genus Testudo. These bones are 

 accompanied by a label to this effect: " Miocene, E. W, Maruock, 

 Atascosa county, Texas." How this matei'ial came to the Acad- 

 emy there is no record. Mr. Witmer Stone has suggested that it 

 may have been derived from Dr. Leidy's collection; we know 

 also that Mr. Marnock collected in Texas for Prof. Cope, but 

 beyond ihis there is no indication that these bones were ever in the 

 hands of either Prof. Cope or Dr. Leidy, 



These remains consist of the left half of the anterior lobe of the 

 plastron and Ihe greater portion of the left side of the hinder lobe. 

 Figures of these parts are here presented. 



Fiaj. 2. 



Fig. 1. 



The species has been one of considerable size. The xiphiplas- 

 tron has had a length of about 110 mm. ; the whole posterior lobe 

 a length approximately of 120 mm. The anterior lobe has had 

 about the same length. We may perhaps safely estimate 200 mm. 



