A more detailed account of this affair may be found in one of our ancient historic tales, of the class called Catha or Battles, which Professor O'Curry pronounces to be "almost the earliest event upon the record of which we may place sure reliance."
"An Illustrated History of Ireland from AD 400 to 1800"
Mary Frances Cusack
In the Irish historic tales called "Catha; or Battles," as given by the learned O'Curry, a record is preserved of a real battle which was fought between the Tuatha-de-Dananns and the Fir Bolgs, from which it appears that these two races spoke the same language, and that they were intimately connected with the Formorians.
"The Antediluvian World"
Ignatius Donnelly
He notices two species, and distinguishes them as Catha edulis and Catha spinosa.
"First Footsteps in East Africa or, an Exploration of Harar"
Richard F. Burton