In three adult giraffes described by Professor Owen it was from 124 to 136 feet long; one dissected in France had this canal 211 feet long; while Dr.Crisp measured one of the extraordinary length of 254 feet, and similar variations are recorded in other animals.[22] The number of ribs varies in many animals.

Mr.St.George Mivart says: "In the highest forms of the Primates, the number of true ribs is seven, but in Hylobates there are sometimes eight pairs.

In Semnopithecus and Colobus there are generally seven, but sometimes eight pairs of true ribs.

In the Cebidae there are generally seven or eight pairs, but in Ateles sometimes nine" (_Proc.Zool.

Soc._, 1865, p.