The snowy heron is a rare plume bird seen occasionally along the coast.
Mantle-skirt, allowing the g, Gill-plume (ctenidium).
The young lack the ornamental plume, and in them the head and neck are clothed with short black feathers, while the bill is yellow.
It is important, because such a concrescence is by no means universal, and does not occur, for example, in Mytilus or in Arca; further, because when its occurrence is once appreciated, the reduction of the gill-plates of Anodonta to the plume-type of the simplest ctenidium presents no difficulty; and, lastly, it has importance in reference to its physiological significance.
Abu '1 Kasim Mansur (or Hasan), who took the nom de plume of Firdousi, author of the epic poem the Shahnama, or "Book of Kings," a complete history of Persia in nearly 60,000 verses, was born at Shadab, a suburb of Tus, about the year 329 of the Hegira (941 A.D.), or earlier.