Here, as on other occasions, I lie under a heavy disadvantage, for, out of the many striking cases which I have collected, I can give only one or two instances of transitional habits and structures in allied species; and of diversified habits, either constant or occasional, in the same species.
Oraingo honetan ere, beste batzuetan bezala, desabantaila handian nago, bildu ditudan kasu nabarmen askotarik adibide bat edo bi besterik ezin baitut eman, espezie berean iragaitzazko azturak eta egitura eta espezie hurbiletan aztura ezberdinduak, iraunkorrak edo noizik behingoak, daudela erakusteko.