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Changing my position, so that the pinna might not be deprived of its share of the rays of the sun, the valves soon furtively opened. A slight movement on my part and they closed again, without having revealed any hidden charms. After a few minutes, a certain confidence being established between us, the pinna emerged from its retirement, in so far as such creatures are permitted by Nature.

But the habitual product of this pinna is small, dull, mud-tinted or brown, and of no value whatever. Another of the genera grows "seed" of excellent lustre, corresponding with the azure brightness of the shell.

Now, the manatee has not the slightest trace of a pinna or external ear, a small orifice, like a slit, representing that organ. To quote the precise language of Murie in the Proceedings of the London Zoological Society, vol. 8, p. 188: "In the absence of pinna, a small orifice, a line in diameter, into which a probe could be passed, alone represents the external meatus."

They were spun from very fine thread, and were so closely woven and so hot that I doubt if he cared to wear them unless in cool weather. Since then the weaving of pinna silk has been abandoned, although now and then one sees bits of it in some old fabric, or on exhibition somewhere. It is chiefly regarded as a curiosity." "What a lot you know, Josef!" murmured Marie, astonished. Josef laughed.

The external ear consists of an expanded portion known as the pinna or auricle, and of a passage, the auditory canal or meatus, leading inwards from it. The surface of the auricle is convoluted to collect and transmit the vibrations of air by which sound is produced the auditory canal conducts these vibrations to the tympanic membrane. Many animals move the auricle in the direction of the sound.

We might pass from the fibrous plants, and the metamorphosis of flax into cotton, to the Pinna, whose fibres grow in the sea on the coast of Italy, and anchor the huge shell-fish to the rock or the sand. These fibres are brought up by divers, and woven into beautiful fabrics.

Or might not one of the many unintelligent admirers of the pinna itself find entrance by drilling or by the violent crushing of the valves, and, ignoring the treasure, destroy the organs and the substance by and from which it was being delicately elaborated?

Both their numbers and their station made it dangerous to treat them as enemies; and the emperor ordered all persecution to be stopped. The imperial rescript for that purpose was even addressed to "Dionysius, Pinna, Demetrius, and the other bishops;" it grants them full indulgence in the exercise of their religion, and by its very address almost acknowledges their rank in the state.

In the performance of its function the ear receives and transmits sound waves and also concentrates them upon a suitable exposure of nerve cells. It includes three partsthe external ear, the middle ear, and the internal ear. The pinna by its peculiar shape aids to some extent the entrance of sound waves into the auditory canal. It consists chiefly of cartilage.

"The pinna is a variety of shell-fish not unlike the mussel; it fastens itself to the rocks and from between its shells gives out threads something like those of the spider or silkworm. By means of them it spins a tough fibre by which it joins itself to any object to which it wishes to cling." "And did they succeed in making pinna silk, Josef?" demanded Marie eagerly.