les sinus qui se trouvent ⁠⟨⁠sur le⁠⟩⁠ trajet de l’air, et, dès lors, les frontaux sont dans ce cas aussi bien que tous ceux qui entourent les fosses nasales; dès lors aussi, par l’écartement des deux lames de l’os, le gonflement des bosses frontales, indépendantes et séparées par un silon—“—²

I suppose you have Owen’s British Fossil Mammalia—look to pp 88 & 89 & you will find one or two remarks having reference to DeBlainvilles conclusions—³ It is true what DeB. states—that the frontal sinuses & the facial part of the skull is particularly prone to vary

⁠⟨⁠section missing⁠⟩⁠

Geo R Waterhouse

It is not true, in my opinion, that all these Fossil Cave Bears are of one & the same species— there are certainly two very distinct species— The one with the enormous frontal sinuses (U. spelæus) varies much in the development of the part in question, but there are characters in the teeth & form of the lower jaw (especially in the condyle) of U. priscus which make it easy of separation—