320 GLOSSAEY. 



the cud, such as oxen, sheep, and deer. They have divided 

 hoofs, and are destitute of front teeth in the upper jaw. 



Saceal. — Belonging to the sacrum, or the bone composed usually 



of two or more united vertebras to which the sides of the pelvis 



in vertebrate animals are attached. 

 Sarcode. — The gelatinous material of which the bodies of the 



lowest animals (Protozoa) are composed. 

 Scutell^e. — The horny plates with which the feet of birds are 



generally more or less covered, especial: y in front. 

 Sedimentary Formations. — Hocks deposited as sediments from 



water. 

 Segments. — The transverse rings of which the body of an articulate 



animal or Annelid is composed. 

 Sepals. — The leaves or segments of the calyx, or outermost envelope 



of an ordinary flower. They are usually green, but sometimes 



brightly coloured. 

 Serratures. — Teeth like those of a saw. 

 Sessile. — Xot supported on a stem or footstalk. 

 Silurian System. — A very ancient system of fossiliferous rocks 



belonging to the earlier part of the Palaeozoic series. 

 Specialisation. — The setting apart of a particular organ for the 



] erformance of a particular function. 

 Spinal Chord. — The central portion of the nervous system in the 



Vertebrate, which descends frum the brain through the arches 



of the vertebrae, and gives off nearly all the nerves to the various 



organs of the body. 

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



within the petals. They usually c insist 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. 



