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The posterior, inner process of the stipes on the maxillæ of insects.

At a point of duration far distant, either prior or posterior; as, not long before; not long after; long before the foundation of Rome; long after the Conquest.

ertean worms, parasitic in the gill cavity of clams and other bivalves. They have a large posterior sucker, like that of a leech. See Illust. of Bdellomorpha.

em or branch of a plant; pith. Medulla oblongata. Etym: [L., oblong medulla] (Anat.), the posterior part of the brain connected with the spinal cord. It includes all the hindbrain except the cerebellum and pons, and from it a large part of the cranial nerves arise. It controls very largely respiration, circulation, swa…

erior end of the canal, including the cavity of the mouth, and the proctod, a part at the posterior end, which are formed by invagination and are lined with epiblast.

Of or pertaining to the lobe of the carapace of crabs covering the posterior branchiæ.

Of or pertaining to the two posterior gastric lobes of the carapace of crabs.

The most posterior of the three pairs of embryonic renal organs developed in many vertebrates.

The posterior division of the foot in the Gastropoda and Pteropoda.

The posterior of the three principal basal cartilages in the fins of fishes. -- Me*tap`ter*yg"i*al, a.

The most posterior element of the sternum; the ensiform process; xiphisternum.

The last or posterior segment of the thorax in insects. See Illust. of Coleoptera.

The posterior part of the brain, including the medulla; the afterbrain. Sometimes abbreviated to meten.

s or nasal openings, -- the anterior nares being the external or proper nostrils, and the posterior nares, the openings of the nasal cavities into the mouth or pharynx.

constitutes the primitive axial skeleton around which the centra of the vertebræ and the posterior part of the base of the skull are developed; the chorda dorsalis. See Illust. of Ectoderm.

Compressed or flattened antero-posteriorly, or in a way opposite to the usual one.

t of the head, or to the occipital bone. Occipital bone (Anat.), the bone which forms the posterior segment of the skull and surrounds the great foramen by which the spinal cord leaves the cranium. In the higher vertebrates it is usually composed of four bones, which become consolidated in the adult. -- Occipital poin…

The back, or posterior, part of the head or skull; the region of the occipital bone.

The principal opercular bone in the upper and posterior part of the gill cover.

The middle of the posterior, or dorsal, margin of the great foramen of the skull.