4. BENIDENIA. 



137 



the end of the process for there to he any resemhlance between the 

 lateral processes of these genera and that of the genus Physalus. 

 From what I have observed, I believe that no such change takes 

 place, and that the form of the processes and the situation of the 

 perforations afford good characters for the separation of the species 

 into groups and the species from each other. 



Fig. 25. 



Fifth cervical vertebra of Benedenia Enoxii. 



Fig. 26. 



First and second ribs of Benedenia Knoxii. 



