GLOSSARY. 503 



Stnaptictjl^ (Gr. sunapto, I fasten together). Transverse props sometimes 

 found in Corals, extending across the loculi like the bars of a grate. 



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. 

 Tabso-metatarsus. The single bone in the leg of Birds produced by the 



union and anchylosis of the lower or 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. tedus, covered ; and Gr. bragchia, gills). A division 



of 02}isthobranc7iiate Gasteropoda in which the gills are protected by the 



mantle. 

 Tegumentary (Lat. tegumentuvi, a covering). Connected with the integu- 

 ment or skin. 

 Teleostei (Gr. teleios, perfect; osteon, bone). Tlie 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. 

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

 Terricola (Lat. terra, earth ; and cola, I inhabit). Employed occasionally 



to designate the Earth-worms {Lumbricidce). 

 Test (Lat. testa, shell). The shell of MoUusca, which are for this reason 



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



also, the thick, leathery, outer tunic in the Tunicata. 

 Testaceous. Provided with a shell or hard covering. 

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



characterised by the possession of four gills. 

 Thalassicollida (Gr. thalassa, sea; IcoUa, glue). A division oi 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. 

 Theriodontia (Gr. therion, a beast ; odous, tooth). A group of Reptiles so 



named by Owen in allusion to the Mammalian character of their teeth. 

 Theriomorpha (Gr. ther, beast ; morphe, shape). Applied by Owen to the 



order of the Tail-less Amphibians (Anoura). 

 Thorax (Gr. a breast-plate). The chest. 

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



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

 Totipalmat^ (Lat. totus, 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 windpipe). The tube which conveys air 



to the lungs in the air-breathing Vertebrates. 

 Trachea. The breathing-tubes of Insects and other Articulate animals. 

 Tbachearia. The division of Arachnida which breathe by means of 



tracheae. 



