]12 Sjyeyicer and Walcott : 



previously disturbed. Tlie cuts were not noticed until the bones 

 collected were being cleaned in the Museum. The bone itself 

 Plate XXXVITI., Fig 2) is apparently the cylindrical part of the 

 shaft of a kangaroo tibia, about five inches in length, and in the 

 same fossil condition of all the bones of extinct forms occurring 

 in the caves. 



From the substance of the piece, it seems to belong to a 

 kangaroo as large as, or larger than, the greatest of our existing 

 species. At the small end of the bone, commencing almost at 

 the extremity, and extending along the prominent longitudinal 

 ridge in the form of a double scallop (a) and (b) for about 

 54 mm., there is a long, almost continuous cut, as if the sur- 

 face had been sliced off. The first scallop (a) is very shallow, and 

 the further one (b), which terminates somewhat abruptly, is about 

 3 mm. deep, measured from the top of the ridge. The part con- 

 necting the two scallops has apparently, for about ,6 mm., not 

 been touched at all, and the ridge for that distance still remains. 



The side of the bone opposite to these cuts has been gnawed 

 for its whole length by some small rodent, such as a rat, the 

 marks of both upper and lower incisors being perfectly dis- 

 tinct, but with these, which may have been added at a recent 

 time, we do not propose to deal. 



In order to compare the cuts wdth those which might have 

 been made by ThyJacoIeo, a clay model approximating the bone 

 in question was prepared, and a slice was cut from its side 

 by the upper shearing tooth attached to a piece of the skull, 

 taken from the cave in which the bone was found. 



The resemblance of the contour of the cut so produced, when 

 viewed from the side, to that on the bone is so remarkably 

 close that it seems almost beyond dispute that they were both 

 made by the same means. 



The measurements, as nearly as they could be taken, agreed ; 

 and a groove corresponding to one formed by a ridge on the 

 anterior external surface of the tooth was plainly visible in 

 the corresponding position. The only difference noticed was 

 in the abrupt termination of the cut made in the clay model 

 by the posterior end of the tooth, and this might be accounted 

 for by the depth of the cut being greater than the one on the 

 bone, which is not quite continuous, and gives the impression 



