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erior part of the notochord; a mesoblastic, or protovertebral, somite. See Illust. of Ectoderm.

e appendages. The head and most of the body were covered with large bony plates. See Placodermi.

An extinct order of ganoid fishes. They had a compressed body, covered with dermal ribs (pleurolepida) and with enameled rhomboidal scales.

ers charged with the government of Spanish municipalities, corresponding to the English alderman.

Any pachyderm belonging to the genera Rhinoceros, Atelodus, and several allied genera of the family Rhinocerotidæ, of which several living, and many extinct, species are known. They are large and powerful, and usually have either one or two stout conical median horns on the snout.

l. -- Ring canal (Zoöl.), the circular water tube which surrounds the esophagus of echinoderms. -- Ring dotterel, or Ringed dotterel. (Zoöl.) See Dotterel, and Illust. of Pressiroster. -- Ring dropper, a sharper who pretends to have found a ring (dropped by himself), and tries to induce another to buy it as valuable…

To subvert by digging or wearing away; to mine; to undermine; to destroy the foundation of. Nor safe their dwellings were, for sapped by floods, Their houses fell upon their household gods. Dryden.

s which form the covering of many fishes and reptiles, and some mammals, belonging to the dermal part of the skeleton, or dermoskeleton. See Cycloid, Ctenoid, and Ganoid. Fish that, with their fins and shining scales, Glide under the green wave. Milton.

See Epidermis.

Induration of the cellular tissue. Sclerema of adults. See Scleroderma. -- Sclerema neonatorum ( Etym: [NL., of the newborn], an affection characterized by a peculiar hardening and rigidity of the cutaneous and subcutaneous tissues in the newly born. It is usually fatal. Called also skinbound disease.…

Induration of any part, including scleroderma.

Induration of the tissues. See Sclerma, Scleroderma, and Sclerosis.

Any one of numerous species of echinoderms of the order Echinoidea.

Fit; suitable. [Obs.] Shaply for to be an alderman. Chaucer.

corrupt; as, sinister aims. Nimble and sinister tricks and shifts. Bacon. He scorns to undermine another's interest by any sinister or inferior arts. South. He read in their looks . . . sinister intentions directed particularly toward himself. Sir W. Scott.

ss; -- said of legislative assemblies, courts, etc.; as, the court sits in January; the aldermen sit to-night.

(Zoöl.), any insect which destroys the prepared skins of animals, especially the larva of Dermestes and Anthrenus. -- Skin of the teeth, nothing, or next to nothing; the least possible hold or advantage. Job xix. 20. -- Skin wool, wool taken from dead sheep.

The outer, or parietal, one of the two lamellæ into which the vertebrate blastoderm divides on either side of the notochord, and from which the walls of the body and the amnion are developed. See Splanchopleure.

The inner, or visceral, one of the two lamellæ into which the vertebrate blastoderm divides on either side of the notochord, and from which the walls of the enteric canal and the umbilical vesicle are developed. See Somatopleure. -- Splanch`no*pleu"ric, a.

Bewilderment; perplexity. [R.] Shak. Stomach staggers (Far.), distention of the stomach with food or gas, resulting in indigestion, frequently in death.