1397.] Trituberculy : 997 
Woodward, in which it is shown that in those Insectivora in 
which the protocone is still the most prominent cusp of the superior 
molars, this cusp also appears first in embryogeny, the paracone 
and metacone following. Woodward points out that this is not 
the case in other Insectivora, for they agree with the Primates, 
Ungulates and other types which have been carefully investi- 
gated, in the late appearance of the protocone. Woodward 
infers from these conflicting facts that there were two modes of 
wun ee 
4.—THE THREE PRIMARY Forms. 
A ese of the Dolphin. 
B. Triconodont (? Secondary) of the Seal, Leptonyz. 
C. Tritubercular of the Cape Mole, Chrysochloris. 
cusp evolution within the order Insectivora, one in which the 
protocone appeared first, and another in which the protocone 
appeared third or last. Such a double genesis seems to the 
writer highly improbable. 
It is, however, certainly important, as Woodward and many 
others have observed, to strengthen the paleontological evi- 
dence for the tritubercular theory. The writer has recently 
