Option B
A. The head and the snout are elongate.
B. There are 1 to 2 ridges on the soft palate behind the last teeth in the upper jaw. These are not much different than any ridges between the teeth.
Select

Option A
A. The head is rounded and the snout blunt.
B. There are 2 or more (up to 7) ridges on the soft palate behind the last teeth in the upper jaw. These differ from ridges between the teeth by being less robust.
Select