Missing vertices in Edit Mode I have append a mesh (rex) from this .blend file.

In edit Mode I see different vertices from objcet mode (see pictures).
The vertices of belt are missing!

OBJECT MODE: 

EDIT MODE: 

How can I edit vertices of belt?
Is It a bug?

This is my .blend file maybe can help.
In edit mode press Alt+H to unhide the vertices.

Vertices were hidden by pressing H in edit mode.