GLOSSARY. 485 



Stamens. — The male organs of flowering plants, standing in a circle 

 within the petals. They usually consist of a filament and an 

 anther, the anther being the essential part in which the pollen, or 

 fecundating dust, is formed. 



Sternum. — The breast-bone. 



Stigma. — The apical portion of the pistil in flowering plants. 



Stipules. — Small leafy organs placed at the base of the footstalks of 

 the leaves in many plants. 



Style. — The middle portion of the perfect pistil, which rises like a 

 column from the ovary and supports the stigma at its summit. 



Subcutaneous. — Situated beneath the skin. 



Suctorial. — Adapted for sucking. 



Sutures (in the skull). — The lines of junction of the bones of which 

 the skull is composed. 



Tarsus (pi. Tarsi). — The jointed feet of articulate animals, such as 



insects. 

 Teleostean Fishes. — Fishes of the kind familiar to us in the 



present day, having the skeleton usually completely ossified and 



the scales horny. 

 Tentacula or Tentacles. — Delicate fleshy organs of prehension 



or touch possessed by many of the lower animals. 

 Tertiary. — The latest geological epoch, immediately preceding the 



establishment of the present order of things. 

 Trachea. — The windpipe or passage for the admission of air to the 



lungs. 

 Tridactyle. — Three-fingered, or composed of three movable parts 



attached to a common base. 

 Trilobites. — A peculiar group of extinct Crustaceans, somewhat 



resembling the Wood-lice in external form, and, like some of them, 



capable of rolling themselves up into a ball. Their remains are 



found only in the Paleozoic rocks, and most abundantly in those of 



Silurian age. 

 Trimorphic. — Presenting three distinct forms. 



*» 



Umbellifer^e. — An order of plants in which the flowers, which 

 contain five stamens and a pistil with two styles, are supported 

 upon footstalks which spring from the top of the flower stem and 

 spread out like the wires of an umbrella, so as to bring all the 

 flowers in the same head (umbel) nearly to the same level. {Ex- 

 amples, Parsley and Carrot. ) 



Ungulata. — Hoofed quadrupeds. 



Unicellular. — Consisting of a single cell. 



Vascular. — Containing blood-vessels. 



Vermiform. — Like a worm. 



Vertebrata ; or Vertebrate Animals. — The highest division of 

 the animal kingdom, so called from the presence in most cases of 

 a backbone composed of numerous joints or vertebrae, which con- 

 stitutes the centre of the skeleton and at the same time supports 

 and protects the central parts of the nervous system. 



Whorls. — The circles or spiral lines in which the parts of plants are 



arranged upon the axis of growth. 

 Workers. — See Neuters, 



