164 SHUFELDT. 



sternal ends of the seventli pair of costal ribs articulate with each other 

 in the mesial line, and at the same time with the distal end of the last 

 sternebra. The xiphisternum is united to the mesostemum at the dorsal 

 aspect of this triple articulation ; this is an unusual arrangement among 

 mammals, possibly not existing in any other known species. It is entirely 

 different in Talpa, and very probably in other insectivores. 



In the articulated skeleton the xiphisternum is about opposite the tenth 

 dorsal vertebra, and the entire sternum has an average length of 4.5 

 centimenters. 



\To le concluded.'] 



