Part 168

PIN´ION, n. Part of the wing beyond the wrist exclusive of the feathers; usually the metacarpus and phalanges; the hand bone. Not technically used synonymously with quill or wing.

PIN´NATED, a. Having little wing-like tufts of feathers on the neck.

PIN´NIFORM, a. An epithet of the penguin’s wing; fin-like.

PISCIV´OROUS, a. Fish-eating.

PITU´ITARY, a. That secretes mucus. Pituitary membrane, the mucous membrane of the nasal passages. Pituitary gland, a certain appendage of the brain.

PLA´GA, n. Stripe of color.

PLAN´TA, a. Back of tarsus, homologically the sole. (106.)

PLAN´TAR, a. Pertaining to the sole. A certain muscle is the plantaris.

PLAN´TIGRADE, a. Walking on the back of the tarsus as well as on the soles of the toes. Many pygopodous birds are plantigrade.

PLAS´MA, n. Colorless fluid of the blood.

PLAS´TIC, a. That may be moulded. Forming or serving to form; histogenetic. Plastic force. See NISUS FORMATIVUS.

PLEU´RA, n. Membrane lining the thorax and investing the lungs.

PLEURAPOPH´YSIS, n. Segment of the hæmal arch next to the centrum. The vertebral rib of a bird is a pleurapophysis.

PLEX´US, n. Union in network of nerves, vessels, or fibres. Said especially of the anastomosis of nerves.

PLI´CA ALA´RIS, or PLI´CA PREALA´RIS, n. The feathered fold of skin on the front border of the wing stretched by an elastic tendon from the shoulder to the wrist, rendering the smooth straight anterior border of the wing. (Plica alaris is rarely used for the fold or bend of the wing.)

PLI´CA INTERDIGITA´LIS, n. Webbing between the toes. Same as palama.

PLI´CÆ PRIMITI´VÆ, n. pl. Primitive folds; certain parallel lines observed in the early embryonal trace.

PLU´MA, n. A feather in general. Compare PENNA and PLUMULA. (1.) A feather of which the two webs are equal and alike is called isopogonous: otherwise anisopogonous.

PLU´MAGE, n. The feathers, collectively; PTILOSIS (which see).

PLUM´BEOUS, a. Having the color of tarnished lead; dull bluish-gray.

PLUM´IPED, a. Having the feet feathered.

PLU´MOSE, PLU´MOUS, a. Feathery; in general, having feathers; feathered. Compare PENNACEOUS and PLUMULACEOUS.

PLU´MULA, n. A down feather, lacking certain qualities and parts of a penna.

PLUMULA´CEOUS, n. Downy. Compare PENNACEOUS.

PNEUMAT´IC, a. Relating to the respiratory system; permeated with air.

PNEUMOGAS´TRIC, a. Pertaining to lungs and belly; a name of the most extensive cranial nerve.

PODARTH´RUM, n. Foot-joint; the articulation of the toes collectively with the metatarsus. (100.)

PO´DIUM, n. Foot. (Same as pes.) Generally used, however, for the toes collectively without the shank. (112.)