GLOSSARY 327 



Cyst, sist (Gr. kustis, a bladder), a term applied to certain Protozoa when 

 they surround themselves with a wall and pass into a resting stage. 



cytopharynx, si'to far' ingks (Gr. kutos, a vessel; pharungx, gullet), a tube 

 leading from the bottom of the oral groove into the body of a Paramecium. 



cytoplasm, si'to plazm (Gr. kutos, a vessel ; plasma, anything formed), the 

 substance of the cell body as opposed to that of the nucleus. 



diastase, dT'a stas (Gr. diastasis, a separation), a substance which has the 

 property of converting starch into sugar. 



diastole, di as' to le (Gr. diastole, separation), the period of time during which 

 a rhythmically pulsating vessel is relaxed or dilated. 



digestion, dijes'tyon (L. digestio, the dissolving of food), the process of pre- 

 paring food for absorption. 



dioecious, dte'shus (Gr. dis, twice ; oikos, a house), h^gpg the sexes distinct, 

 applied to species that consist of male and female individuals. 



diploblastic, dip lo bias 1 tik (Gr. diploos, double; blastos, a bud), having two 

 germinal layers. 



dissimilation, di sim i Id 'shon (L. dissimilare, make unlike), the processes 

 by which protoplasm is broken down into simpler products. 



distal, dis'tal (L. disto, I stand apart), situated away from the place of attach- 

 ment. 



dorsal, dor 1 sal (L. dor sum, the back), of or pertaining to the back. 



ecdysis, ek di sis (Gr. ekdusis, emerging), shedding or molting the external 

 covering. 



ectoderm, ek' to derm (Gr. ektos, outside ; derma, skin), the outer germ layer. 



ectosarc, ek'to sark (Gr. ektos, outside; sarx, flesh), the outer layer of cer- 

 tain Protozoa. 



efferent, efe rent (L. ef for ex, out ; fero, I carry), conveying outward. 



egestion, ejes'chon (L. egestio, void), the act of voiding the refuse of digestion. 



electrotropism, e lek'tro tro pizm (Gr. elektron, amber; trope, a turning), re- 

 action to the electric current. 



embryo, em'bri o (Gr. en, in ; bruo, bud), the early stage of an animal when 

 it is within the egg membrane. 



endopodite, endop'ddtt (Gr. endon, within; pous, a foot), the r'nner of the 

 two main divisions of a typical crustacean appendage. 



endosarc, en 1 do sark (Gr. endon, within ; sarx, flesh), the inner protoplasm 

 of certain Protozoa. 



enteron, en'teron (Gr. enteron, intestine), the digestive tract that is primi- 

 tively derived from the entoderm. 



entoderm, en* to derm (Gr. endon, within ; derma, skin), the inner germ layer. 



enzyme, en'zim (Gr. en, in ; zume, leaven), an unorganized ferment. 



