iW) 
Measurements, M. 
Diameter of first tubercular / @tcro-posterior.......... -006 
CHONSVCTSO...5 godaaccad aauace 005 
Antero-posterior diameter second tubercular............ 003 
Length of base of superior sectorial................... 009 
en bases of two tuberculars...... eer reT er -012_ 
ee base of first: tubercular...................0% 0064 
Canis GEISMARIANUS, sp. nov. 
This species of dog may be placed with reference to the size of its infe- 
rior sectorial tooth between the C. lppincottianus and C. hartshornianus. 
In the robust proportions of this tooth it more nearly resembles the @. 
cuspigerus. The mandibular ramus is robust and shallow, and quite dis- 
tinct from the deep jaw of ©. hartshornianus. The sectorial has perhaps 
twice the bulk of those of the C. kppincottiunus and O. cuspigerus. From 
that of the latter it diflers further in the small inner tubercle and con- 
tracted heel. 
The sectorial part of the tooth is relatively small, not exceeding the heel 
in length, nd its cusps are low. The heel is notable for the elevation of 
the tubercle of the inner side—which exceeds that of the outer; the latter 
also, is contracted, standing within the external base, which is represented 
by a short cingulum. <A weak cingulum below tle sectorial blades. Sur- 
face of the enamel rugose where not exposed to friction. 
Measurements. M. 
vertical, anterior cusps........ 006 
: ‘ OT esas 9 9's hale he v4 0038 
Dinmeters of sectorial 4 antero-posterior ............-- OLS 
transverse, middle............ 006 
Depth ef ramus at sectorial...... Citi Te Aa eal apes eae 012 
Thickness of ‘“ es sche arte oe epee apenas otras BOOT 
The affinities of this species are evidently with the C. cuspigerus. It is 
named in honor of Jacob Geismar, a skillful naturalist of Philadelphia. 
MACHARODUS STRIGIDENS, Sp. nov. 
This obviously distinct species is only represented by the crown of a 
superior canine tooth, from which the apex has been broken. Its characters 
are so peculiar that I record it under the above name, Lot knowing whether 
I shall have better specimens. 
The tooth is long and very much compressed, much more so than in any 
species of the genus known to me. Its anterior and posterior edges are 
finely and very perfectly denticulate without lateral flexure near the base. 
The centre of each side of the tooth is occupied by a wide open gutter, so 
that the greatest transverse diameter of the crown is not at its middle. 
These gutters become planes towards the apex, giving an elongated ‘hex- 
agonal section. The size indicates an animal of the proportions of the 
M. primecus, and smaller than the M. brachyops. 
