Tortoiseshell Tortoiseshell Tortoiseshell or tortoise shell is a material produced from the shells of the larger species of tortoise and turtle, mainly the hawksbill sea turtle, which is an endangered species largely because of its exploitation for the material. The large size, fine colour and unusual form of the hawksbill's scutes make it especially suitable. The distinctive patterning is referred to in names such as the tortoiseshell cat, several breeds of guinea pig, and the common names of several species of the butterfly genera "Nymphalis" and "Aglais", and some other uses. Tortoiseshell was widely used from ancient times in the West
Hawksbill Station from the colony. The newcomer has been sent to evaluate the prisoners and to recommend whether they are appropriate for retrieval. With return now possible, the leader of the exiles realizes that he is a time traveler of a different sort. The struggle against the authoritarian government, his life's work, is over. His closest friends in the movement, as well as his most bitter enemies, are dead. He is tempted to visit the newcomer's future, but Hawksbill Station is now the only existence he knows. "Algis Budrys" said that "Hawksbill Station" was Silverberg's best story. "Hawksbill Station" was credited by