ANIMAL BIOLOGY.
[1.] “Barˈna-cles.” A kind of shell fish, now recognized as belonging to the Articulata. They are provided with a long, flexible footstalk, by means of which they adhere either to fixed or floating objects. At the summit of this stalk are shelly valves, five in number, which enclose the principal organs of the animal. This shell opens and closes to admit of its spreading out and retracting a net-like organ, by means of which the animal catches its food, which consists of small crustacea. On emerging from the eggs, young barnacles are free, and are furnished with organs of locomotion, and with large eyes, but in a short time a change occurs in them. They assume the form of their parents, and attach themselves to some place of residence. In warm climates they are exceedingly abundant, and often fasten themselves in such numbers to the bottom of a vessel as to retard its progress.
[2.] “Fourteen-footed Crustacea.” The beach-fleas which are found so commonly among weeds, belong to this order, and the mantis shrimp.
[3.] “Ten-footed Crustacea.” This order is represented by the shrimp.
[4.] “Cephalo-thorax,” sephˈa-lo thoˈrax. Head-chested. The first segment of the animal contains the head and the chest.
[5.] “Carapace,” carˈa-pace.
[6.] “Epidermis,” ĕp-i-dermˈis. The thin, semi-transparent covering over the true skin. It is readily seen in the occurrence of blisters, as the fluid is always contained between it and the dermis, or true skin. It extends over the whole body, even the front of the eye.
[7.] “Acarina,” ă-ka-reeˈna.
[8.] “Pedipalpi,” pedˈi-palˈpĭ. The word is derived from two Latin words, meaning a foot, and to touch softly.
[9.] “Araneina,” ar-a-nīˈna.