. Monographs of North American rodentia [microform]. Rodentia; Paleontology; Rongeurs; Paléontologie. mkmr r'f liff â /⢠.,f â '. 424 MONOGRAPHS OF NORTH AMERICAN RODENTIA. A cast of a skull (from an unknown locality) now before me has a length of over twelve inches, considerably exceeding in size the Clyde skull described and figured by Dr. Wyman. The species being known only from a few cranial and dental remains, it is impossible to say much respect- ing its general form or probable habits. It may have been aquatic, like the Beaver; but of this there is no evidence. The form of the occipit
. Monographs of North American rodentia [microform]. Rodentia; Paleontology; Rongeurs; Paléontologie. mkmr r'f liff â /⢠.,f â '. 424 MONOGRAPHS OF NORTH AMERICAN RODENTIA. A cast of a skull (from an unknown locality) now before me has a length of over twelve inches, considerably exceeding in size the Clyde skull described and figured by Dr. Wyman. The species being known only from a few cranial and dental remains, it is impossible to say much respect- ing its general form or probable habits. It may have been aquatic, like the Beaver; but of this there is no evidence. The form of the occipital condyles and the surfaces for the attachment of the cranial muscles show that it probably differed greatly in habits from the Beaver. Mr. J. W. Foster described (anonymously) u radius lound with the two mandibular rami discovered at Nashporf, Ohio, which he presumed to belong to the same animal. This bone he describes as being ten inches in length, and as measuring two inches across tlu ead and one and a half across the distal extremity.* In a later notice af the same specimens, Mr. Foster makes no mention of this bone, and no other naturalist appears to have given any further account of it. Mr. Foster regarded it as "an animal closely allied to the Beaver, but far surpassing him in magnitude". Dr, Wyman not only does not refer to it as a Beaver, '>ut dwells especially upon the important differ- ences that separate it from that animal. The remains of Castoroid&f ohioensis thus far reported consist of the two right rami of the lower jaw and an upper incisor from Nashport, Licking County, Ohio (from which the animal was originally made known), first described by Foster; the skull and a right ramus of the lower jaw from Clyde, Wayne County, New York, described (and the skull figured) by Wyman ; the ramus of a lower jaw from Memphis, Tennessee, also described and figured by Wyman; " two molars, an upper incisor, and two petrous bones ", from near
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