Glossary 3 \$ 



Sty-k'-i.a. A genus of Ascidians. 



Svm'-mi.-ikv. The condition where opposite sides or poles arc alike; 



bilateral, having equivalent right and left sides. 

 S\ \-ap'-sis. The conjugation of maternal and paternal chromosomes 



preceding the maturation of divisions. 

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

 Te-nkb'-ri-o. A genus of beetles, the larva of which is the common 



meal worm. 

 Ter-a-tol'-o-gy. The science which deals with monstrous or abnormal 



forms. 

 Tet'-rads. Bivalent chromosomes which appear 4-parted in the matura- 

 tion divisions. 

 To-tip'-o-tence. The capacity of a cleavage cell to give rise to a whole 



animal. 

 Tox'-in. A poisonous substance particularly such as is produced by 



bacteria. 

 Tri-hy'-brid. The offspring of parents differing in three characters. 

 Troph'-o-elast. The outer layer of the blastodermic vesicle of a mammal. 

 Tro'-pisms. Automatic movements of organisms toward or away from a 



source of stimulus. 

 Unit Character. A character which is inherited as a whole and cannot 



be sub-divided. 

 Vegetative pole. The pole of an egg opposite the polar bodies. 

 Vil'-li. Processes which grow out from the embryonic membranes of a 



mammal and connect it to the walls of the uterus. 

 Vi-tel'-line membrane. A delicate membrane around an egg secreted by 



the egg itself. 

 Viv-i-par'-i-ty. Young brought forth "alive," i.e.. in an advanced stage 



of development. 

 Zy'-gote. The product of the union of male and female sex cells. 



