276 
The American Geologist. 
November, 1893 
speak, of the tooth is about 90°. The usual blunt cusp ex- 
tends about half way along the vertical part of the tooth, and 
.-it the side of this is ;i plate or flange, as in other species, 
nearly an inch wide, as shown in the figure. The cusp pro- 
jects about hall' an inch beyond the flange. So far there is 
little thai is remarkable. But the surface of this premaxil- 
3i7tt<-/ftiyj qraa/is. a* 
"q/ir maiuHiiit 
t finer /ate 
inner face 
lary is ornamented in a fashion singular for a tooth. These 
organs are usually quite smooth, for securing better 
penetration, but this one is dotted over, as may be 
seen from the figure, with tubercles of various size 
and arrangement. At one side five or six of them project 
from the vertical edge, almost like small teeth. Some 
of those in the middle of the row have been broken off. 
so that it is not possible to determine their original 
length, but the perfect ones are at least one eighth of an inch 
high. On the front face of the tooth are nine or ten vertical 
rows of similar hut lower tubcn-h-s. with from three to six in 
a row and less prominent than those on the edge. On the 
other (outer?) edgeareabout six more. Two or three are also 
scattered on the hack of tin- flange above mentioned, so that 
they are to he found more or less over the whole exposed 
surface of the tooth. 
The root or inserted part presents no feature worthy of 
special notice, but closely resembles that of the other species 
of Dinichthys. 
