ART. 35 



MASTODONS FOUND IN TEXAS HAY 



11 



premaxilla (text-fig. 4). The base of this tusk is at the left end 

 of the figure. There is accurate contact between the two pieces 

 on the side not seen. The diameter of the tusk at the proximal end 

 is 60 mm., and 50 mm. at the end of the premaxilla. The cross- 

 section (text-fig. 5) is somewhat pear-shaped. The enamel band is 



Fig., 4. — Gomphothekium cimaeeonis. View of base of uppee bight tdsk, seen from 

 ODTSiDB, mof., eSsagmbnt of maxilla, pmx.. Fragment op premaxilla. X-5 



shown by the thick black line. Five fragments fitting accurately 

 and cemented together are believed to belong to this same tusk. At 

 its proximal end the greater diameter is 56 mm., the lesser 47 mm. 

 Inasmuch as the diameter at the distal end of the premaxilla is only 



/>/77A 



Figs. 5-7.— Gomphotherilm cimaeeonis. 5, Cross section of tdsk of Figdrb 4^ 



WHERE IT emerges FROM THE SKULL. SeEN LOOKING TOWARD THE SKDLL. i.NAMEL 

 BAND BLACK. V -To., 6, CROSS SECTION OF TUSK 150 MM. ABOVE DISTAL EXTREMITY. 



Seen looking toward skull. X-S. a. Enamel band; b. Upper surface; c. Lower. 

 SURFACE. 7, Cross section of tusk taken 100 mm. above distal end. Seen looking 

 toward skull. X .6. a, i, c. As in Figure 6 



4 mm. more than this, the length of the piece missing can not be 

 great, but it can hardly be determined. This distal portion (pi. 4, fig. 

 3) is curved outward and slightly downward. The band of enamel 

 is on the concave side. This band becomes reduced in width at the 

 proximal end as age advances. On the fragments bearing the pulp 



