All the other teeth are simple, conical, minute and placed at considerable and irregular intervals apart in the jaws, the number appearing to vary in different individuals and even on different sides of the jaw of the same indi viduals.
52), referable to the family Clavidae; a fact sufficient to Indi a cate the tentative character of even the most modern classifications of this order.
The number (n C r) of combinations of r indi viduals out of a stock of n has in effect been proved in ï¿½ 41 (i.) to be n (r) .
Their residence must have lain chiefly in Indi.Vis.
The individuals inhabiting the Indus and the Ganges must therefore have been for long ages isolated without developing any distinctive anatomical characters, those by which P. indi was separated from P. gangetica having been shown to be of no constant value.