If the aim of the Society be only to convert men from sins they have no mind to, and to convince them of errors to which they have no temptation, they might as well be spending their money to persuade schoolmasters that two and two make four, or mathematicians that there cannot be two obtuse angles in a triangle.

In C. pumicosa the avicularium is placed subapically on a solitary posterior obtuse mucro, but in C. bilabiata there are two such processes longer and more pointed, one in front and the other behind the mouth; the avicularium, as in the former case, being placed immediately below the apex of the posterior mucro.