i ks'i i niMD.i:. 



455 



T. pertenuis were evidently wider than those of T . pansa. In the former the penultimate 

 vertebral had a width equal to 0.56 of the whole length of the carapace; while in T. pansa the 

 corresponding scute has been only 0.26 as long as the carapace. The epiplastral lip of T . 

 pertenuis has had straight and, according to Cope's figure, parallel lateral borders. 



Testudo campester sp. nov. 

 Figs. 610-613. 



'Testudo campester, Hay, Hull. Amer. Mus. Nat. I list., xix, 1903, p. 627, in paper by J. W. Gidley and 

 without description. 



The remains on which this species is based were collected for the American Museum of 

 Natural History during the summer of 1900, by Mr. James W. Gidlev. Thev were found in 

 the Blanco beds ot the Pliocene deposits, near Mount Blanco, Crosby Countv, Texas. The 

 materials all belong to one individual, and consist of the nearly complete plastron, the lateral 

 and the posterior peripherals from one inguinal notch to the other, a portion of the nuchal 

 bone, 2 neurals and parts of a few others, and portions of several costals. The shell originally 

 had a length of about 730 mm. and a width of at least 560 mm. It was apparently of moderate 

 convexity and ot medium height. The number of the specimen is 3930. 



The greater portion of the plastron (fig. 610) is present, but it has suffered some damage 

 thru decay ot the bone and loss of fragments. The total length equals 670 mm. It is 

 somewhat concave in the hinder half, and the anterior lobe was lifted above the plane of the 

 rest ot the plastron. The length of the anterior lobe equals 180 mm.; its width, at the axillary 

 notch, has been close to 325 mm. From the axillary notch the outline of the anterior lobe is 

 moderately convex as far as the gular suture; from this point the outline changes its course 

 and runs in a straight line forward and inward to the outer anterior angle of the lip. 



The lip was quite prominent. Owing to some damage to the plastron in this region its 

 width can not be determined with all desirable exactness; but it was very close to 125 mm. 

 Its front is truncated or slightly convex and probably without notch; but the portion present 

 does not extend to the midline. The width of the base at the gular sutures was about 175 

 mm.; the length in the midline about 80 mm. The upper surface is slightly convex from the 

 midline to the lateral border, and this convexity is continued backward to the posterior end of 

 each of the epiplastra. Antero-posteriorly the lip is very slightly convex above. The lower 

 side of the lip is convex both longitudinally and transversely. This convexity diminishes 

 backward, so that the hinder ends of the epiplastra are nearly plane. The free border of the 

 epiplastra from near the midline ot the lip to their hinder ends is rather sharply rounded. 

 From this border the bone thickens rapidly, so that at the middle of the length and breadth of 

 the epiplastron the thickness equals 46 mm., while at its hinder end the thickness is 37 mm. 



Seen from above the thickness of the lip continues backward for about 100 mm. and then 

 becomes suddenly reduced. \\ hether or not there was an excavation behind the thickened 

 portion is uncertain. 



Altho the entoplastron and the borders of the epiplastra joining it are somewhat eroded, 

 it is evident that the entoplastron itself was transversely oval. Its transverse width was close 

 to 160 mm.; its antero-posterior extent about 130 mm. 



The antero-posterior extent of the hyoplastra in the midline is 155 mm. That of the hypo- 

 plasia is almost exactly the same. The xiphiplastra meet along the midline for a distance of 

 105 mm. At their anterior ends each has a width of 130 mm. 



The posterior lobe of the plastron has a total length of 105 mm., and it is nearly 300 

 mm. wide. At its hinder extremity there is a right-angled notch whose width behind is qo mm. 

 and whose depth is 45 mm. 



Seen from above, the posterior lobe presents a broad, shallow basin, surrounded at the 

 sides by a bony wall. Just behind the inguinal notch this wall rises, from the lower side of the 

 plastron, to a height ot 55 mm. Here the outer face of the bone overhangs somewhat. Further 

 behind, the wall descends, and the outer face looks more and more upward and the summit of 

 the wall is rounded off. From the posterior part of this summit a low ridge runs to the tip of 

 each of the terminations of the plastron. 



Most of the sulci separating the dermal scutes of the plastron are remarkable for their 

 depth. Along the midline runs a groove so deep as to cut halfway thru the bone, and of about 



