. Report of the geological exploration of the fortieth parallel . Ftg Fiorua 4. — Vertical section of t f spcromis n-jaiis, yiarsU; (^o. i:OG). 5. — Horizontal secti^Il . ,,tli; botli eularged thirty-two diameters. Fio cm: 6. — Tooth of Z/i> /i/i«(Xo. 1206); enlarged eight diameters. Fiom-7.—Tooth of i/bs ^ ;.nc<j)«, Marsh ; half natural size. a. enamel of crown; 6. dentine; c. pulp cavity in crown; b root of tooth ; f. absorbed cavity in root d. younfj tooth; sf. intersection of liorizontal and vortical sections. 16 ODONTORNITHES The layer of enamel gradually increases in th
. Report of the geological exploration of the fortieth parallel . Ftg Fiorua 4. — Vertical section of t f spcromis n-jaiis, yiarsU; (^o. i:OG). 5. — Horizontal secti^Il . ,,tli; botli eularged thirty-two diameters. Fio cm: 6. — Tooth of Z/i> /i/i«(Xo. 1206); enlarged eight diameters. Fiom-7.—Tooth of i/bs ^ ;.nc<j)«, Marsh ; half natural size. a. enamel of crown; 6. dentine; c. pulp cavity in crown; b root of tooth ; f. absorbed cavity in root d. younfj tooth; sf. intersection of liorizontal and vortical sections. 16 ODONTORNITHES The layer of enamel gradually increases in thickness from the baseof the tooth to the apex, as shown in figure 4, a. It is also somewhatthicker over the anterior cutting edge than in other portions of the baseof the crown, as indicated in figure 5. The line of junction between theenamel and the dentine is everywhere sharply defined. The enamel isdense and hard, the calcification having proceeded so far, in the sjoecimensexamined, that the constituent fibres could not be distinguished. Theexternal surfac
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