512 GLOSSARY 



SEX-LINKED. Any character, the determiner of which is as- 

 sociated with the determiner of sex. 



SIMPLEX FACTORS or CHARACTER. A condition where the de- 

 terminer for a character is derived from one parent only. 



SIN'-IS-TRAL SNAIL. 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. 



SPER-MA-TO-GO'-NI-A. Primordial sperm cells. 



SPER-MA-TO-ZO'-ON. 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-RIL'-LA. A spiral type of bacteria. 



STEN'-TOR. A ciliated protozxmn. 



STER-E-O-I'-SO-MERES. Molecules having different properties 

 dependent upon varying spacial relations of their con- 

 stituent atoms. 



STIM'-U-LUS. Anything acting on an organism which calls 

 forth a response. 



STY-E'-LA. A genus of Ascidians. 



SYM'-ME-THY. The condition where opposite sides or poles are 

 alike; bilateral, having equivalent right and left sides. 



SYN-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'-RI-O. A genus of beetles, the larva of which is the 

 common meal worm. 



