512 GLOSSARY 



Sex-linked. Any character, the determiner of which is as- 

 sociated with the determiner of sex. 



Simplex Factors or Chaeactek. A condition where the de- 

 terminer for a character is derived from one parent only. 



Sin'-is-tbal skail. a type of snail in which the shell coils 

 from base to apex in an anti-clockwise direction. 



So'-MA. The body as contrasted with the germ cells. 



So-mat'-ic. Pertaining to the body, as contrasted with "germi- 

 nal" pertaining to the germ cells. 



So'-ma-to-plasm. The body-plasm as contrasted with the 

 germ-plasm. 



So'-MiTE. A segment of the body of a segmented animal. 



Sper-ma'-to-cytes. The mother and grandmother cells of 

 spermatozoa. 



Sper-ma-to-gen'-e-sis. The development of a spermatozoon 

 from a primitive sex cell. 



Speb-ma-to-go'-ni-a. Primordial sperm cells. 



Sper-ma-to-zo'-ost. The mature male sex cell. 



Spindle. The nuclear division figure. 



Spi'-reme. a coiled thread of chromatin which appears in the 

 nucleus at the beginning of division. 



Spi-kil'-la. a spiral type of bacteria. 



Sten'-tor., a ciliated protozoan. 



Ster-e-o-i'-so-meees. Molecules having different properties 

 dependent upon varying spacial relations of their con- 

 stituent atoms. 



StiSi'-tj-ltjs. Anything acting on an organism which calls 

 forth a response. 



Sty-e'-la. A genus of Ascidians. 



Sybi'-me-tby. The condition where opposite sides or poles are 

 alike; bilateral, having equivalent right and left sides,. 



Syk-ap'-sis. The conjugation of maternal and paternal chro- 

 mosomes preceding the maturation divisions. 



Syn-dac'-tyl-ism. The condition of having webbed fingers or 

 toes. 



Te-neb'-ei-o. a genus of beetles, the larva of which is the 

 common meal worm, 



