584 GLOSSARY. 



TESTACEOUS. Provided with a shell or hard covering 



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

 characterised by the possession of four gills. 



TUALASSICOLLIDA (Gr. thalatsa, sea ; kolla, glue). A division of Protozoa. 



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



THECOSOMATA (Gr. thete ; and soma, body). A. division of Pteropodout 

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



THERIOMORPHA (Gr. Uw, beast ; morphe, shape). Applied by Owen to tbo 

 order of the Tail-less Amphibians (Anoura). 



THORAX (Gr. a breastplate). The chest 



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. 



TOTIPALMAT.E (Lat. Mvs, 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 trachda, the rough windpipe). The tube which conveys air 

 to the lungs in the air-breathing Vertebrates. 



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



TBACHEARIA. The division of Arachnida which breathe by means of tra- 

 cheae. 



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



TROCHANTER (Gr. trecho,l turn). A process of the upper part of the thigh- 

 bone (femur) to which are attached the muscles which rotate the limb. 

 There may be two, or even three, trochanters present. 



THOCHOID (Gr. trocfios, a wheel ; and eidos, form). Conical with a flat base ; 

 applied to the shells of Foraminifera and Univalve Molluscs. 



TROPHI (Gr. trophos, a nourisher). The parts of the mouth in insects which 

 are concerned in the acquisition and preparation of food. Often called 

 ' ' instruments cibaria. " 



TROPHOSOME (Gr. trepho, I nourish ; and soma, body). Applied collectively 

 to the assemblage of the nutritive zooids of any UydrozoSn. 



TRUNCATKD (Lat. trunco, I shorten). Abruptly cut off; applied to univalve 

 shells, the apex of which breaks off. so that the shell becomes " decol- 

 lated." 



TUBICOLA (Lat. tula, a tube ; and colo, I inhabit). The order of Annelida 

 which construct a tubular case in which they protect themselves. 



TUBICOLOUS. Inhabiting a tube. 



TUNICATA (Lat. tunica, a cloak). A class of Molluscoida which are enveloped 

 in a tough leathery case or "test." 



TURBINATED (Lat. turbo, a top). Top-shaped ; conical with a round base. 



ULNA (Gr. olene, the elbow). The outermost of the two bones of the fore- 

 arm, corresponding with the fibula of the hind-limb. 



UMBELLATE (Lat. umbtlla, a parasol). Forming an umbel i.e., a number of 

 nearly equal radii all proceeding from one point. 



UMBILICUS (Lat. for navel). The aperture seen at the base of the axis of 

 certain univalve shells, which are then said to be "perforated" or " um- 

 bilicated." 



UMBO (Lat. the boss of a shield). The beak of a bivalve shell. 



UMBRELLA. The contractile disc of one of the Lttcernarida. 



UNCINATE (Lat. uncinus, a hook). Provided with hooks or bent spines. 



UNOUICULATE (Lat. unguit, nail). Furnished with claws. 



UNGULATA ( Lat ungula, hoof). The order of Mammals comprising the Hoofed 

 Quadrupeds. 



UNGULATE. Furnished with expanded nails constituting hoofs. 



UNILOCULAR (Lat. unus, one ; and loculus, a little purse). Possessing a single 

 cavity or chamber. Applied to the shells of Foraminifera and Mollutca. 



UNIVALVE (Lat. uniu, one ; valvce, folding-doors). A shell composed of a 

 single piece or valve. 



URODELA (Gr. oura, tail ; delot, visible). The order of the Tailed Amphi- 

 bians (Newts, &c.) 



