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Crisp (_Proc. Zool. Soc._, 1862, p. 137) found the gall-bladder
present in some specimens of Cervus superciliaris while absent in
others; and he found it to be absent in three giraffes which he
dissected. A double gall-bladder was found in a sheep, and in a small
mammal preserved in the Hunterian Museum there are three distinct
gall-bladders.
The length of the alimentary canal varies greatly. 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.


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