GLOSSARY.. 68 1 



TABULA (Lat. tabula, a tablet). Horizontal plates or floors found in some 

 Corals, extending across the cavity of the "theca," from side to side. 



TACTILE (Lat. tango, I touch). Connected with the sense of touch. 



T^ENIADA (Gr. tainia, a ribbon). The division of Scolecida comprising the 

 Tape-worms. 



T.ENIOID (Gr. tainia; and cidos, form). Ribbon- shaped, like a Tape-worm. 



TARSO-METATAKSUS. The single bone in the leg of Birds produced by the 

 union and anchylosis of the lower and distal portion of the tarsus with the 

 whole of the metatarsus. 



TARSUS (Gr. tarsos, the flat of the foot). The small bones which form the 

 ankle (or "instep" of man), and which correspond with the wrist (carpus) 

 of the anterior limb. 



TECTIBRANCHIATA (Lat. tectus, covered ; and Gr. bragchia, gills). A division 

 of Opisthobranchiate Gasteropoda in which the gills are protected by the 

 mantle. 



TEGUMENTARY (Lat. tegnmentum, a covering). Connected with the integu- 

 ment or skin. 



TELEOSTEI (Gr. teleios, perfect; osteon, bone). The order of the "Bony" 

 Fishes. 



TELSON (Gr. telson, a limit). The last joint in the abdomen of Crustacea ; 

 variously regarded as a segment without appendages, or as an azygous 

 appendage. 



TENUIROSTRES (Lat. tcnuis, slender ; rostrum, beak). A group of the Perch- 

 ing Birds characterised by their slender beaks. 



TERGUM (Lat. for back). The dorsal arc of the somite of an Arthropod. 



TERRICOLA (Lat. terra, earth ; and colo, I inhabit). Employed occasionally 

 to designate the Earth-worms (Lumbricidce). 



TEST (Lat. testa, shell). The shell of Mollusca, which are for this reason 

 sometimes called "Testacea;" also, the calcareous case of Echinoderms ; 

 also, the thick leathery outer tunic in the Tunicata. 



TESTACEOUS. Provided with a shell or hard covering. 



TESTIS (Lat. testis, the testicle). The organ in the male animal which pro- 

 duces the generative fluid or semen. 



TETRABRANCHIATA (Gr. tetra, four; bragchia, gill). The order of Cephalopoda 

 characterised by the possession of four gills. 



THALASSICOLLIDA (Gr. thalassa, sea; kolla, glue). A division of Protozoa. 



THECA (Gr. theke, a sheath). A sheath or receptacle. 



THECOSOMATA (Gr. theke; and soma, body). A division of Pteropodous 

 Molluscs, in which the body is protected by an external shell. 



THERIOMOKPHA (Gr. ther, beast; rnorphe, shape). Applied by Owen to the 

 order of the Tail-less Amphibians (Anoura). 



THORAX (Gr. a breastplate). The chest. 



THREAD-CELLS. (See Cnidse). 



THYSANURA (Gr. thusanoi, fringes; and oura, tail). An order of Apterous 

 Insects. 



TIBIA (Lat. a flute). The shin-bone, being the innermost of the two bones of 

 the leg, and corresponding with the radius in the anterior extremity. 



ToTiPALMATiE (Lat. lotus, whole ; palma, the palm of the hand). A group 

 of "Wading Birds in which the hallux is united to the other toes by mem- 

 brane, so that the feet are completely webbed. 



TRACHEA (Gr. tracheia, the rough wind-pipe). The tube which conveys air to 

 the lungs in the air-breathing Vertebrates. 



TRACHEA. The breathing-tubes of Insects and other articulate animals. 



TRACHEARIA. The division of Arachnidq which breathe by means of tra- 

 cheae. 



TREMATODA (Gr. trema, a pore). An order of Scolecida. 



TRICHOCYSTS (Gr. thrix, hair ; and kustis, a cyst). Peculiar cells found in 

 certain Infusoria, and very nearly identical with the "thread-cells" of 

 Coslenterata. 



TRILOBITA (Gr. treis, three ; lobos, a lobe). An extinct order of Crustaceans. 



TRITOZOOID (Gr. tritos, third;. soon, animal; and eidos, form). The zooid 



