GLOSSARY. 37 



Deci'dua sero'tina (L. dcdduus, falling; serofinits, slowly 



ripening). The part of the decidua which intervenes 



between the ovum and the uterus. 

 Deci'dua ve'ra (L. deciduus, falling; -vents, true). That 



portion of the decidua which lines the uterus, except 



where the ovum is attached to it. 

 Dscidua'ta (L. dectduus, falling). A division of the Monodel- 



phia in which the maternal part of the placenta is thrown 



off with the foetus. 

 Deciduous (L. deaduus, falling). A term applied to those 



trees which shed their leaves annually ; also to the first, or 



milk teeth of mammals. 

 Decus'sate (L. decusso, I cross over). To cross over the 



middle line, as the nerve fibres do at the decussation of 



th e anterior pyramids. 

 Defaeca'tion (L. de, down ;/<?.*, feeds, dregs). The act of 



emptying the bowels. 

 Deglutition (L. de, down; glutio, I swallow). The act of 



swallowing. 

 Dehis'ce (L. dehisccre, to gape, open). To open, as does a 



seed-vessel when ripe. 

 Deinosau'ria (Gr. deinos, terrible ; sauros, a lizard). An extinct 



order of Reptiles. 

 Dela'mination (L. de, away from; lamina, a layer). A coming 



away in layers. 

 Delphinoi'dea (Gr. delphis, delphlnos, a dolphin; eidos, form). 



The division of the Cetacea which comprises, amongst 



other forms, the dolphins. 

 Deltoi'des (Gr. the letter A, delta). Shaped like the Greek 



letter delta. A triangular muscle on the shoulder, also 



termed the humeralis; it is attached to the deltoid ridge of 



the humerus. 

 Dendrocoe'la (Gr. dendron,z. tree; koilia, a hollow, the bowels). 



A division of theTurbellaria in which the digestive cavity 



gives off csecal processes which are frequently branched. 

 Den'tary (L. dens, dentis, a tooth). The bone of the lower 



jaw which contains the teeth. Relating to the teeth. 

 Den'tate (L. dens, dentis, a tooth). Toothed. Applied to the 



second or axis vertebra, because of its tooth-like process. 

 Den'tine (L. dens, dentis, a tooth). The calcified material 



which forms the chief constituent of a tooth. 

 Depres'sor pal'pebrae infe'rio'ris (L. the depressor of the lower 



eyelid). The muscle which depresses the lower eyelid. 



