trigorhina

[Pref. trigo ( no- ), and Gr. rhis (gen it. rhinos )=the snout.] Palæont .: A genus of Rajide, from the Tertiary strata of Monte Postale. tri-grăm, subst . [Pref. tri- , and Gr. gramma = a letter.] The same as TRIGRAPH (q. v.). tri-gram-măt'-Ic, tri-grăm-mic, adj . [Eng. trigram ; -atic , -ic.] Consisting of three letters, or three sets of letters. tri-graph, s . [Pref. tri- , and Greek graphō =to write. A name given to three letters having one sound; a triphthong, as eau in beau . IMG:content-1445.png:[blocks in formation] of inner oval of upright posts. 2. Tomb of Is odor us (A. D. 222) at Khat our a, near Aleppo. 3. Trilithon at Elkeb (late Roman?), about forty-five miles S. E. from Tripoli. are at Stone henge, on Salisbury Plain, England. In the trilithons still standing, each of the uprights has a tenon on its surface, and the under sides of the architrave or horizontal piece have each two mortises into which the tenons fit. According to Olaus Magnus ( de Gent . Sept. , p. 49) similar monu- ments were formerly erected in Sweden over the graves of nobles and other eminent persons; and Fergu on ( Rude Stone Monuments , p. 101), consid. ers that the trilithon " is only an improved dolmen, standing on two legs instead of three or four." (See regarded as another illustration of the curious similarity Prehistoric Times (ed. 1878), p. 133. three, and lat us (gen it. later is )=a side.] Having three sides; three-sided, as a triangle. trill, s . [Ital. trillo a trill, a shake.] I. Ordinary Language: birth. 2. A composite crystal composed of three ind i- viduals. as lorr. II. Music : 1. The same as SHAKE (q. v.). "I have often greatly in number; the abdominal segments coa- lesce to form a caudal shield (the pygidium); and there is a well developed upper lip (the hypostome), formed by a doubling of the head-shield. The Tri- lobita are exclusively Paleozoic, and range from the Upper Cam brian (in which the Primordial Tri- lobites of Barrande are found) to the Lower Carbon- iferous of Europe and America, attaining their maximum in the Silurian. More than 500 species are known, distributed in many genera, which are arranged in about twenty families. attributed many of his trills and quavers to the coldne of the weather." Tatler , No. 222. 2. The rapid repetition of a note in singing. (VI-tri-lo-bite, s . [TRILOBITA.] BRATO.] trill (1), v. t. & i . [Italian trill are = to trill, to shake, to quaver; Dut. trillen ; Ger. trillern .] IMG:content-1446.png:[blocks in formation] IMG:content-1447.png:[merged small][graphic] 2. To flow in a small stream or in rapid drops; to ered by a thin trickle. "But through his fingers, long and slight, Fast trilled the drops of crystal bright." cornea. Thenum B ber varies greatly, Barrande having found as few as fourteen and as many as fifteen you sand facets in each eye in different types. Behind the cephalic shield comes the thorax (B), composed of a number of segments (from two to twenty-six), capable of more or le movement on each other; in several genera this freedom of movement was so great that species could roll themselves up into a ball, like a hedgehog. The thorax is usually trilobed, each body-ring exhibiting the same tri lobation, being composed of a central, more or le convex pine, pit, sire, sir, marine; gō, pot, IMG:content-1448.png:[merged small][merged small][merged small][ocr errors][merged small][merged small][merged small] first structure met with on the lower surface was the hypostome, a broad, and forked plate, situated in front of the mouth in many species, and closely resembling the lip-plate of Apus, recent Phyllopod. Next, Woodward found the remains of a maxillary palp in Asaphus platy cephalus ; and in another individual of the same species Billings found what he considered to be the remains of eight pairs of legs, but Dana and Verrill believed them to be the arches to which the legs were attached. From Walcott's examinations of sections of rolled-up specimens, it appears that the thoracic appendages were slender, five-jointed legs, in which the terminal segment formed a pointed claw, and the basal segment carried a jointed appendage, homologous with the epipodite of many recent Crustaceans. On each side of the thoracic cavity was attached a row of bifid, spiral branchial appendages, and appendages serving also as gills were probably attached to the bases of the thoracic limbs. The mouth was situated behind the hypostome, and bounded by four pairs of jointed manducatory appendages, the basal joints of which were partly or entirely modified to act as jaws. Trilobites vary greatly in size, some being scarcely larger than a pin's head, while species of Asaphus have been met with two feet in length. They appear to have lived on muddy bottoms in shallow water, feeding on small marine animals, and probably swam on their backs, as do the recent Apus and the larval forms of Limulus. IMG:content-1449.png:[blocks in formation] Gecl.: A name given by the Rev. D. Williams to the Pilton beds, from the fact that Phacops latifrons has been found in them. ( H. B. Woodward: Geol. England and Wales , p. 129.) 4187 C. As substantive: Shakesp.: Romeo and Juliet , ii. 1. 1. Dre , garb, ornament. "The calender amazed to see His neighbor in such trim ." Cowper: John Gilpin. sition. Trim of the masts: Low Ger. trim.] A. Transitive : I. Ordinary Language : to the eye. "Some bound in order, others loosely strow'd, To dre thy bower, and trim thy new abode." Dryden: Virgil ; Ecl . ii. 70.