1903.] Osborn, A Neiu Glyptodont from Texas. 493 



plates with three pieces intercalated anteriorh^ Behind these 

 eight distinct rings is the terminal cone, composed of three 

 rings of plates ; of this coossified portion the anterior ring con- 

 tains eight pieces with two anterolateral pieces; the mid-ring 

 is composed of six pieces, and the terminal ring is irregularly 

 composed of four pieces. Thus the tail comprises eight com- 

 plete rings and a terminal cone, the same number as in 

 Glyptodon clavipes as described by Lydekker. The rings 

 gradually increase in length from 60 mm. anteroposterior 

 measurement, and decrease in diameter from 230 to 183 mm. 

 The terminal cone is laterally compressed, measuring 75 mm. 

 transversely and 132 anteroposterior ly. The posterior bor- 

 ders of the ring plates are gently scalloped, not pointed as in 

 Glyptodon clavipes. 



Within the carapace and caudal rings were found one 

 sacrocaiidal and thirteen free caudal vertebra;, with an imper- 

 fectly developed fourteenth, and seven chevrons — all per- 

 fectly preserved. Of these vertebrae the posterior ten, as 

 appears from measurement and from the deflected transverse 

 processes, were fitted within the tail-sheath, there being thus 

 a vertebra for each ring, while the anterior three articulated 

 with the peculiar sacrocaudal vertebrae, in which the greatly 

 elongated transverse processes or ribs extend outward to 

 coossify with the posterior plates of the ischia. The first free 

 caudal has a transverse diameter of 302 mm., and distinct 

 lateral articulations as facets for the posterior borders of the 

 last sacrocaudal and of the ischium; the neural lamina are 

 elevated, the pre- and postzygapophyses are elevated and 

 vertically placed; the neural spine is low; caudals 2 and 3 were 

 also well within the carapace, with transversely extended 

 spines; in caudals 4-1 1 the transverse processes are deflected, 

 downwardly and forwardly directed; the neural arches, 

 zygapophyses, and spines diminish in distinctness. Caudals 12 

 -13 lack all processes. A single chevron of the narrow type, 

 similar to the most anterior chevron in G. clavipes, was found 

 with the specimen; it measures 130 mm. vertically. Six 

 stout chevrons with shallow, obtusely forked inferior pro- 

 cesses, anteroposteriorly expanded distally, are placed beneath 



