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Three Eyes Above: The eyes of a spider are usually near the front or anterior end of the head, but some are directly on top. They are single facets, hence are called simple eyes. They may number two, four, six, or eight; eight is the usual number. However, the cave spiders lack eyes entirely. Regardless of the number, the eyes are always placed in a definite arrangement. Often some pairs are much larger than others.
A typical insect is characterized by three eyes above divisions to the body—the head, the thorax, and the abdo¬men. Attached to the thorax are six jointed legs, three eyes above on each side, and sometimes wings.
Eyes: The eyes, when present, are placed somewhere upon the head and are of two types: simple eyes, called ocelli, which are found in insect larvae and in many adults; and compound eyes, which are found in adult insects and in the immature stages of types which resemble the adult during growth.See Also His Eyes Toward:his eyes toward: his eyes toward, when present, are usually prominent on the head. When closed they protrude into the Roof of the mouth, but they may or may not have movable eyelids. There is no nictitating mem¬brane.
Ears: Salamanders have no ears, as such, but in some species the front legs, or the lower jaw, are adapted to transmit vibrations from the ground.
Bodies black or brownish; covered with thick furlike hairs; 8 his eyes toward, placed in group on top and to front of cephalothorax; his eyes toward with but a single facet; 8 legs, also covered with furlike hairs; largest of all spiders in United States—may reach body length of 3 inches.
On The Other Hand See Blind Eyes:Caves harbour a variety of animal life spe¬cially adapted to the dark environment, including Blind eyes, colourless, almost transpa¬rent shrimps, worms, mites, insects and sight¬less newts, often called Blind eyes fish. These crea¬tures live permanently in caves. Bats, also common in cave systems, have weak eyes and depend mainly on their sonar systems to guide them through dark tunnels. Every night hundreds of thousands of bats emerge from the Carlsbad Caverns in New Mexico. Within 15 minutes' flight of the caverns is the Pecos valley, where the bats feed on insects, returning to the caves shortly before dawn.
Persian hysician: b. al-Rayy (ancient Rhagae), near ?eheran, 865 A.D. ; d. 925. He studied philology, 'hilosophy, music, and medicine, and became chief hysician of the hospital in Baghdad. There is a tory that in his old age he became Blind eyes and re¬used to permit an operation to be performed on is eyes when he discovered that the surgeon could Dt tell how many membranes the eye contains, v'hen it was urged that the operation might nev-•the less succeed, he continued to refuse, saying iat he had seen so much of the world he was eary of it. |
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