CALCAREOUS GONCKEMONS OF KHTTLE POINT 139 
of the concretion along the diameter perpendicular to the plane 
of stratification of the shale. True spheres and spheroids 
exhaust the list of observed forms. The average diameter is 
nearly two feet ; the largest specimen now well exposed on the 
shore, a spheroid, has a polar diameter of a little more than 
three feet, an equatorial diameter of about three feet six inches 
Fic. 4. General view of partially exposed concretions. 
(Fig. 5); the smallest specimen may measure about one foot in 
diameter. 
Large numbers of the concretions are being washed out of 
the much less resistant shales by the waves; their freeing from 
the matrix may be seen in all its stages (Fig. 4). But the 
number now remaining on the shore does not represent the total 
that could be counted were it not for the deplorable habit of the 
numerous visitors to the Point, who not only carry away the 
heavy specimens bodily, but break up others with the hope, 
destined to disappointment, of finding something at the core more 
