. Annual report of the Board of Regents of the Smithsonian Institution. Smithsonian Institution; Smithsonian Institution. Archives; Discoveries in science. PRESENT PK0BLEM8 IX EVOIJJTION AND HEREDITY. :U3 l)Osterior ling^ual cusp, or liypocone, which, as Co{)v has sliowii, is ex- hibited in various degrees of development in different r;ices and is an. Fic. 4. Evolution of the rrsPfS ok thk human molar.—ja;"', protuconul (antpricn- biicoal ciiup*: jxi''. paiaciiuid: vic'\ nietaconid (anterior lingual cus])); Ini', liypoi^oiiirt (pusteiior buccal): ('(;'. ciilo (•i>ni(i (postcriii
. Annual report of the Board of Regents of the Smithsonian Institution. Smithsonian Institution; Smithsonian Institution. Archives; Discoveries in science. PRESENT PK0BLEM8 IX EVOIJJTION AND HEREDITY. :U3 l)Osterior ling^ual cusp, or liypocone, which, as Co{)v has sliowii, is ex- hibited in various degrees of development in different r;ices and is an. Fic. 4. Evolution of the rrsPfS ok thk human molar.—ja;"', protuconul (antpricn- biicoal ciiup*: jxi''. paiaciiuid: vic'\ nietaconid (anterior lingual cus])); Ini', liypoi^oiiirt (pusteiior buccal): ('(;'. ciilo (•i>ni(i (postcriiii-liii;;ii:il ciisi>): iiin'^, (iiitirmccliati'cu^])). Diagram 1.—Ileptiliaii slaiic 1 )ia;;raiii,s 2-.'>. —Mt-sdzuic mammals, first lower sliowiiif; rise of ancestral cusps. Diagram (i. -- Iviceiie carnivore {uiinris), showing how the low tubercular crown u/-! is derived from the liigli crown /;(/. Diagram 7.—Eocene monkey (AnaptomoriilniK), showing liowthe primitive anterior lingual cus)) '' disa|)pears. Diagram 8.—Human first molar with its ancestral cusjis. important race index.* A glance through the diagiams shows tliat tlie develoi)ment of tlie cr()wn lias been l)y the successive addition of new cusps. Without entering upon the details of evidence, which , ' ' taloth. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Smithsonian Institution. Board of Regents; United States National Museum. Report of the U. S. National Museum; Smithsonian Institution. Report of the Secretary. Washington : Smithsonian Institution
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