Claus, that the "green gland" really opens at the end of the process described by Milne-Edwards as a "tubercule auditif" and by Spence Bate as an "olfactory denticle.".    From Wordnik.com.  [Facts and Arguments for Darwin] Reference

Well, I seed little chance of ever seeing them again, or of my seeing five shillings, but as it so happened next tide, the very 'denticle pair of trowsers comes up staring me in the face.    From Wordnik.com.  [Jacob Faithful] Reference

The transitory and singularly small and simple denticle in the horse exemplifies the rudiment of an ancestral structure in the same degree as do the hoofless splint-bones; just as the spurious hoofs dangling therefrom in hipparion are retained rudiments of the functionally developed lateral hoofs in the broader foot of palæotherium.    From Wordnik.com.  [The World's Greatest Books — Volume 15 — Science] Reference