in which these are neglected, or represented inexactly, are 
worthless in the present state of our knowledge. In the 
original Chysis aurea there are five principal ridges on the 
hypochilium, and three minor ones on each side, all downy, 
and diverging; in the whole nine. In C. bractescens there 
are five equal ridges only, all smooth and parallel; and in 
C. levis, there are three large somewhat confluent ridges, and 
one smaller on each side, the whole being smooth. The whole 
of those species of Orchidacee which stand in books without 
a precise description of the tubercles of the lip, require to be 
re-examined critically. 
