All the many forms, extinct and recent, descended from (A), make, as before remarked, one order; and this order, from the continued effects of extinction and divergence of character, has become divided into several sub-families and families, some of which are supposed to have perished at different periods, and some to have endured to the present day.
A-tik datozen forma iraungi eta bizidun guztiek, arestian esan dugun moduan, ordena bat egiten dute; eta ordena hau, iraungipen eta ezaugarri dibergentziaren etengabeko eraginaren ondorioz, zenbait azpifamilia eta familiatan banaturik geratu da, berauetako batzuk aldi ezberdinetan ustez galduak direlarik, eta beste batzuek egundaino iraun dutelarik.