He did however allow Louis Agassiz at Harvard to examine his specimens, and the Swiss professor replied that these were neither teeth of a juvenile nor those of Zeuglodon, but of a separate genus just as Gibbes had first proposed.
Međutim, dopustio je Louisu Agassizu s Harvarda da pregleda njegove primjerke, te je švicarski profesor odgovorio da to nisu bili zubi mladunca ni roda Zeuglodon, već odvojenog roda, kao što je Gibbes isprva predložio.