Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Lower teeth of the ringed seal (Phoca hispida ladogensis). (A) The postcanine dentition consists of five teeth, four of which (II–V) are roughly the same size and have at least three cusps. (B) The range of cusp patterns in the fourth postcanine and the cusp nomenclature used. Anterior is toward the left.
