SUMMARY. F 53 
of the teeth, the development of the snout, the ankylosis of tibia and fibula 
(at least in S. paradoxus). On the other hand Solenodon possesses many 
generalized characters in common with Centetes, Potamogale, Gymnura, and 
even Myogale, the two latter of which are the most generalized members of 
their respective families. Leche (:07) is doubtless correct in making Potamogale 
the representative of a subfamily (Potamogalinae) of Centetidae, since the loss 
of clavicles and certain other peculiarities usually emphasized as distinctive, are 
probably the result of adaptation to an aquatic existence, while the general 
simplicity of structure and the common anal and genital opening certainly ally it 
closely to the Centetinae. On the other hand, Potamogale bears considerable 
superficial resemblance to Solenodon and Myogale in the form of the skull and 
teeth, and it seems probable that all three represent divergent lines of descent 
from some common stock. 
