Another difficulty concerns the type.  The author describes five upper posterior cheek teeth, namely, p3 -m3 inclusive, and in the type you kindly send there are only four superior teeth, three of which belong to one individual and fourth apparently to another.



My present conclusion is that the type of this species, if of Lower Pliocene age, belongs to the genus Archaeohippus, which is a persistent primitive form.



I enclose a carbon of this letter, asking you to kindly send it immediately to Mr. Douglas as I hope to receive a reply from him in time to make any necessary correction in the page proof of my memoir.



With appreciation, believe me,



Sincerly yours,



Director Wm. J. Holland