148 THE AMERICAN NATURALIST. (VoL. XXXIII. 
as far as possible, the probability of error arising from the 
personal equation in general. 
Discussion of the Measurements.— A general similarity will 
be noted in the absolute dimensions of the individual crania, 
except in the case of the male calvarium from Delaware, which 
is somewhat larger than the others. The condition of the three 
New Jersey specimens is such that the capacity cannot be 
gauged by the usual methods. However, the Trenton skull, 
the smallest, is neither so short, so narrow, nor so low as two 
adult crania in the Massachusetts series. In all transverse 
diameters the Trenton skull closely resembles the modern skull 
trom West Chester (Fig. 6), while in the sagittal diameters 
and the projections from the auricular axis it stands nearer the 
Burlington and Riverview skulls. The marked brachycephaly 
Fic. 6. 
of the Burlington skull (Fig. 7) is rare among Algonquian crania, 
and upon the evidence of this character alone the investigator is 
inclined to exclude it from furthér comparison with the Trenton 
