808 



parts to each other, and to the design of 

 the whole ; as a proceeding according to 

 some methodical plan or system. 



T^BNOID. .Riband-shaped, like the Tasnia 

 or tape-worm. 



TARDIGRADA. The name given to a family 

 of anomalous mammalia (the Sloths), dif- 

 fering widely from all other quadrupeds 

 in their habits, economy, and osteological 

 structure. 



TARSUS. The terminal portion of the leg in 

 insects ; affording important characters for 

 generical and family distinctions. It is a 

 jointed piece, armed at its extremity with 

 one or two slender curved hooks (ungues*), 

 and often accompanied by membranous 

 or fleshy cushions (pulvilU). The number 

 of joints varies from two to five. 



TAWNY. A pale dirty orange colour. 



TECTIBRANCHIATE. Belonging to the order 

 of Mollusca in which the gills are covered 

 by the mantle. 



TEGUMENT. The skin or other natural co- 

 vering of an animal body ; a substance 

 serving to defend any otherwise exposed 

 part. 



TEOUMENTARY. Having the properties of, 

 or belonging to, a tegument ; consisting of 

 teguments. 



TELUM. The thirteenth or last segment of 

 insects. 



TEMPORAL. Pertaining to the temples ; as, 

 the temporal arteries, &c. 



TEXTACULA. The feelers of snails, &c. 



TEREBELLA. The instrument or organ with 

 which many female insects bore holes to 

 deposit their eggs. 



TERMINAL. Forming the extremity. 



TERMINOLOGY. That branch of the science 

 of Natural History which explains all the 

 terms used in the description of natural 

 objects. 



TEKTIALS. Those feathers in the wings of 

 birds which take their rise from the second 

 bone, at the elbow-joint, forming a conti- 

 nuation of the secondaries, and seem to do 

 the same with the scapulars, which lie over 

 them. 



TERTIARY (in Geology). Of the third form- 

 ation. The tertiary formation consists of 

 a series of horizontal strata, more recent 

 than chalk beds, consisting chiefly of sand 

 and clay, and frequently embracing vast 

 quantities of organic remains of the larger 

 animals. 



TESSELATED. Chequered like a chess-board. 



TESTACEA. The third order of worms, in- 

 cluding those which are covered with a 

 testaceous shell. 



TESTACEOUS. Composed of the materials 

 which constitute shells, viz. carbonate of 

 lime and animal matter. Pertaining to 

 the Testacea. Also applied to the colour 

 resembling a tile, a dull red. 



TESTUDINAL. TESTUDINOUS. Pertaining to 

 the Tortoise, or resembling it. 



TESTUDINARIOUS. Painted with red, black, 

 and yellow, like tortoise-shell. 



TESTUMNEOUS. Resembling tortoise-shell. 



TETRABRANCHIATE. Belonging to the order 

 of Cephalopods with four gills. 



TEiRADACirLous. Having four toes. 



TETRAGONAL. Wkose horizontal section is 

 quadrangular. 



TETRAHEDRAL. Having four sides. 



TETRAPOD. An insect having only four 

 perfect legs. 



TETRAPTEKOUS. Having four wings. 



THECA. The sheath or case of the proboscis 

 in insects. 



THEORY. An exposition of the general 

 principles of any science ; or, the science 

 distinguished from the practice of an art. 



THERMAL.^ Pertaining to heat ; as, thermal 

 waters, warm or tepid mineral waters. 



THORACIC. Pertaining to the breast, or tho- 

 rax ; as, the thoracic, arteries. Also be- 

 longing to an order of bony fishes, respir- 

 ing by means of gills only, the character 

 of which is that the bronchia are ossicu- 

 lated, and the ventral fins are placed under- 

 neath the thorax, or beneath the pectoral 

 fins. 



THORAX. The anterior mass in peduncu- 

 lated insects. 



THRILL. To feel a sharp tingling or shiver- 

 ing sensation running through the body. 



THROB. To beat rapidly, as the heart or 

 pulse, in consequence of agitation. 



TIBIA. The third portion of the legs in 

 insects. 



TIBIAL. Belonging to the tibia, as the tibial 

 arteries. 



TIERCEL, or TIERCZLET. In falconry, a 

 name given to the male Hawk, as being a 

 third part less in size than the female. 



TITILLATE. To excite by tickling. 



TOROSE. Swelling into knobs or protuber- 

 ances. 



TOMENTOSE. Covered with short interwoven 

 inconspicuous hairs. 



TONELESS. Having no tone ; unmusical. 



TOPAZINK. The yellow splendour of the 

 topaz. 



TOPICAL. Limited ; local, as a topical re- ! 

 medy. 



TORNADO. A violent tempest, distinguished 

 by a whirling motion, and generally hap- 

 pening after extreme heat. They are 

 usually of short duration, and narrow j 

 in breadth, but accompanied with vivid 

 lightning, loud thunder, and torrents of i 

 rain. 



TORTOISE-SHELL. The shell or scales of the 

 tortoise, a valuable article in various manu- 

 factures. 



TORTUOUS. Twisted, wreathed, winding. 



TORULOSE (joints of insects). When they are 

 a little tumid. 



TOXICOLOGY. A treatise or discourse on the 

 nature of poisons. 



TRACHE.B. The air-tubes, which in insects 

 are the organs of respiration. 



TRACHEAL. Pertaining to the trachea or 

 windpipe. 



TRACHELIPODS. The Mollusca which have 

 the locomotive disc or foot attached to the | 

 head. 



TRACHEOTOMY. The surgical operation of I 

 making an opening into the windpipe. 



TRACTILE. Capable of being drawn out in 

 length. 



TRAIN-OIL. The oil procured from the blub- 

 ber or fat of whales by boiling. 



TRAMOSERICEOUS. The splendour of satin, i 



