100 
CllEODONTA. 
and more prominent being a continuation of the posterior projection of the 
lesser tuberosity. There is no internal bicipital ridge. The glenoid cavity 
of the scapula is a wide oval. 
Measurements. 
M. 
Length of the bases of the two inferior true molars . 0. 020 
Length of the base of the last true molar.. 0. 014 
Elevation of the anterior cusp of the last molar.... . 0.0085 
Depth of the ramus at the penultimate molar. 0. 034 
Length of the crown of the last premolar. 0. 014 
Width of the same. 0. 0070 
Diameter of the head of the humerus across both tuberosities ... .. 0.031 
Diameter of the shaft of the humerus below the tuberosities (transverse). 0.0135 
Diameter of the same (antero posterior)... 0. 0215 
Width of the proximal end of the femur. 0. 040 
Diameter of the ball.. 0. 018 
Antero-i)osterior diameter at the little trochanter. 0. 0125 
Least diameter of the glenoid fossa of the scapula.. 0. 014 
The superior molar teeth of the third specimen are accompanied by an 
inferior molar of the same character as that of the type, and I suspect that 
they belong to the 0. morsitans. The three molars preceding the last one 
occupy nearly the same length as the two corresponding posterior molars 
in the 0. lupina. The structural differences between the teeth of the two 
species are, the greater prominence of the internal heel of the third pre¬ 
molar in 0. morsitans and the greater length of the posterior blade of the 
penultimate molar in 0. lupina.* There is a weak external basal cingulum 
in 0. morsitans, and the two triangular molars have each a small anterior 
tubercle. The penultimate molar has, besides the low cusp of the inner 
heel, a strong- internal cingulum, and a small tubercle on each border at the 
inner base of the central cusps. The enamel is strongly but delicately 
wrinkled. 
Measurements. 
M. 
Length of the bases of the three triangular molars. 0.0385 
Length of the bases of the last triangular molar . .. 0. 0143 
Width of the same.. 0. 0114 
Width of the bases of the second triangular molar. 0. 012 
Length of the bases of the second triangular molar. ... 0.0137 
Length of the bases of the fourth inferior molar... 0.012 
* Compare Plato xxsiv, fig. 10, with figs. 14a and IGa of the same plate. 
