Menopoma

Some of the tailed Amphibia still retain the gill-clefts in the side of the neck, though they have lost the gills themselves (Menopoma).

The Evolution of Man — Volume 2 Ernst Heinrich Philipp August Haeckel 1876

-- Menobranchus. four limbs, and in other respects more or less resembles in appearance, as it does in size, the genus Menopoma before noticed.

The Common Frog 1874

In a North American genus, however (Menopoma), which, though smaller in size, closely resembles Cryptobranchus in figure, there is a permanent gill-opening, though the gills themselves disappear in the adult,

The Common Frog 1874