Part 173

RI´MA ORIS, n. Equivalent to COMMISSURE (which see).

ROS´TRUM, n. Bill; beak; projecting forepart of head of birds; of two jaws, upper and lower, consisting of a frame of certain bones over which is stretched unfeathered skinny or horny membrane, the rhamphotheca. (9.)

ROUND´ED (tail), a. Having the central feathers longest, the rest successively gradually and slightly shorter. A tail is double-rounded when, with central feathers shorter than the next, the rest are graduated as before.

RU´DIMENT, n. A beginning.

RUDIMEN´TARY, a. Undeveloped; imperfectly elaborated; existing only in its beginnings.

RUFF, n. Set of lengthened or otherwise modified or peculiarly colored feathers around the throat or whole neck.

RU´GA, n. Ridge or raised fold; wrinkle.

RUGOSE´ or RU´GOUS, a. Wrinkled.

RUMP, n. UROPYGIUM (which see). (60.)

SAC´RAL, a. Pertaining to the sacrum.

SAC´RUM, n. A compound bone of the spine, composed of several anchylosed vertebræ of the pelvic region, with which the iliac bones are sutured.

SAC´RO-COCCYGE´AL, a. Pertaining to the sacrum considered as comprising also several coccygeal vertebræ.

SAG´ITTATE, a. Arrow-head shaped; an elongated cordate figure with pointed lobes.

SALI´VA, n. Spittle.

SAL´IVARY GLANDS. Organs secreting saliva.

SAL´TATORY, a. Progressing by leaps. Opposed to ambulatory or gradient.

SAN´GUIS, n. Blood.

SAPHE´NA, n. Principal vein of the leg.

SARCOLEM´MA, n. Same as myolemma.

SARTOR´IUS, a. Name of a certain muscle of the leg.

SAUROP´SIDA, n. A primary group of vertebrata, comprising birds and reptiles.

SAURU´RÆ, n. pl. Name of a certain primary group of Aves formed for the reception of the Archæopteryx.

SCAB´ROUS, a. Scabby; scurfy; scaly. Said of a surface roughened as if in such manner.

SCANSO´RIAL, a. Capable of climbing, as a woodpecker.

SCAPHOLUN´AR, n. One of the carpals or wrist-bones.

SCAP´ULA, n. Shoulder-blade.

SCAP´ULAR, a. Pertaining to the shoulder-blade; as, scapular region.

SCAP´ULAR, n. Any feather of a series growing on the pteryla humeralis, in an oblique line across the humerus. Scapulars is generally said, the plural designating these feathers collectively; they are also called scapularies. (80.) The scapulars fill up what would otherwise be an interval between the inner border of the wing and the body. Illiger’s word, parapterum, seems to designate them, but is also used in an entirely different sense.