116 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. &«. 



There is also an upper third right molar of another individual 

 (Cat. No. 9014). 



These teeth are larger than any known to the writer which belong 

 to Bison bison, even larger than those of a large male from Alberta.^ 

 There is present also a lower hindermost left molar (Cat. No. 9013), 

 considerably worn, and also damaged in front. Its length at the 

 base was 50 mm. It is impossible to say to what species of Bison 

 these teeth belonged ; but quite certainly not to B. hison. They are 

 larger also than the teeth of B. occidentalis.'- Possibly they are the 

 teeth of B. latifrons or those of B. regius. 



MAMMUT AMERICANUM (Kerr). 



This species is meagerly represented in McAdams' collection. 

 There are only a fragment of what appears to have been a root of 

 a molar (Cat. No. 9015) and a fragment of a cusp (Cat. No. 9016) of 

 a very immature molar. 



MARMOTA MONAX (Linnaeus). 



Of this species there are in the collection four incisor teeth. Two 

 are upper incisors, side by side in a nodule. Another upper incisor 

 is partly inclosed in a nodule, and a lower incisor is similarly placed. 

 There appears to be no reason for regarding these teeth as belonging 

 to any other species. 



CASTOR CANADENSIS Kuhl. 



This species is represented by 13 nodules, which contain the lower 

 teeth or some of them, with sometimes a part of the bone badly 

 preserved ; and by several loose lower teeth and a single upper molar. 

 These specimens have the United States Museum numbers 9020-9034. 

 One nodule (U.S.N.M. Cat. No. 9026), marked by McAdams' num- 

 ber 205, presents four molars and a part of one lower incisor. 

 This still retains its orange color. The length of the tooth row on 

 the grinding surfaces is 30 mm. The incisor is 7 mm. wide. 

 Another nodule (Cat. No. 9027), mostly dissolved away or never 

 formed, presents the molars and most of that part of the incisor 

 which was yet in the bone. The incisor is still yellow. The length 

 of the tooth row is 31.5 mm. The part of the incisor present is 58 

 mm. long and 8 mm. wide. In one nodule (Cat. No. 9021) the 

 incisor has a width of 9 mm. ; the anterior grinding tooth, a width 

 of 8 mm. These must have belonged to an unusually large in- 

 dividual. 



CASTOROIDES OHIOENSIS Foster. 



In the collection there is a lower left incisor with some of the base 

 missing and a little of the tip. The length of the fragment is 240 



* Thirty-sixth Ann. Rep. Geol. Surv. Ind., p. 648. 

 2 Twenty-third Ann. Rep. Geol. Surv. Iowa, p. 320. 



