GLOSSARY. 305 
SIRENIA (Gr. seven, a mermaid), An order of Mammalia comprising the 
Dugongs and Manatees. 
SOLIDUNGULA (Lat. solidus, solid; ungula, a hoof). The group of Hoofed 
Mammals comprising the Horse, Ass, and Zebra. 
Somatic (Gr. soma, body). Connected with the body. 
SOMITE (or soma). A single segment in the body of an Articulate 
animal, 
SPICULA (Lat. spiculwm, a point). Pointed needle-shaped bodies. 
SPINNERETS. The organs by means of which Spiders and Caterpillars 
spin threads. 
SPONGIDA (Gr. spoggos, asponge). The division of the Protozoa commonly 
known as sponges. 
STERNUM (Gr. sternon), The breast-bone. i 
STOMAPODA (Gr. stoma, mouth ; poda, feet). An order of Crustacea. 
STOMATODE (Gr. stoma, mouth). Possessing a mouth. The Jnfusoria are 
thus often called the Stomatode Protozoa. 
STREPSIPTERA (Gr. strepho, I twist; pteron, a wing). An order of Insects 
in which the anterior wings are represented by twisted rudiments. 
STREPSIRHINA (Gr. strepho, I twist; rhines, nostrils), A group of the 
Quadrumanda. 
SucToRIAL. Adapted for suction or for imbibing fluids. 
SUPRA-GSOPHAGEAL, Placed above the gullet or csophagus. 
TABUL (Lat. tabula, a tablet). Horizontal plates or floors which are 
found in many Corals. 
TACTILE (Lat. tango, I touch). Connected with the sense of touch. 
THNIADA (Gr. tainia, a ribbon), The order of Scolecida comprising the 
Tape-worms. , 
TARSO-METATARSUS. The single bone produced in Birds by the union 
and anchylosis of the lower part of the tarsus with the metatarsus. 
Tarsus (Gr. tarsos, the flat of the foot). The small bones which form 
the ankle (or ‘‘instep” of man), corresponding with the (carpus) of the 
anterior limb. 
TELEOSTEI (Gr. teleios, perfect ; osteon, bone). An order of Fishes often 
spoken of as the Bony Fishes. 
TELSON (Gr. a limit). The last joint in the abdomen of the Crustacea. 
TENUIROSTRES (Lat. tenuis, slender; rostrum, beak). A group of the 
Perching Birds characterised by their slender beaks. 
TERRESTRIAL (Lat. terra, earth). Living upon dry land. 
TEST (Lat. testa, a shell), The shell of Mollusca, which are for this 
reason sometimes called Zestacea. Also, the calcareous shell of Sea- 
urchins. Also, the thick leathery outer tunic of the Sea-squirts T’unicata, 
TETRABRANCHIATA (Gr. tetra, four; bragchia, gills). The order of Mollusca 
characterised by the possession of four gills. 
THALASSICOLLIDA (Gr. thalassa, sea; kolla, glue). A division of Protozoa. 
THERIOMOBPHA (Gr. ther, beast; morphe, shape). Employed by Owen to 
designate the ‘‘ tail-less Amphibians,” such as Frogs and Toads. 
THORAX (Gr. a breastplate). The chest. 
THYSANURA (Gr. thusanoi, fringes; oura, tail). An order of Insects. 
Trp1a. The shin-bone, corresponding to the radius of the fore-limb, and 
being the innermost of the two bones of the leg, 
TRACHEA (Gr. tracheia, the rough wind-pipe). The tube which conveys 
air to the lungs in the air-breathing Vertebrates. In Insects, Myriapods, 
and Spiders, the air-tubes which ramify through the body. 
TREMATODA (Gr. trema, a pore or hole). ‘An order of Scolecida. 
TRILOBITA (Gr. treis, three ; lobos, alobe}. An extinct order of Crustacea. 
TUBICOLA (Lat. tuba, a tube; colo, inhabit), An order of Annelida. 
