192 THE FIRST PRINCIPLES OF HEREDITY 



Sea-anemone (Gr. anemos, wind), a kind of polype living in wind 

 swept situations. 



Sea-squirt, a marine animal. 



Segmentation (L. secare, to cut) , the act of cutting into parts. 



Segregation (L. se, apart ; grex, flock), separation into like parts. 



Seminal (L. semen, seed), pertaining to the seed. 



Soma, somatic (Gr.), body. 



Somatogenic (Gr. soma, body; genes, producing), arising in the 

 body (p. 96). 



Spermatophore (Gr. sperma, seed ; pherein, to bear), the case 

 enclosing the spermatozoa in some invertebrates. 



Spermatozoon (Gr. sperma, seed ; zoon, animal), the male sex- 

 elements (p. 22). 



Sporulation (Gr. sporos, seed), the act of producing spores. 



Stamen (L. stare, stand) , the male organs of the flower. 



Stirp (L. stirp, root) (p. 56). 



Telegony (Gr. tele, distance ; gonos, seed) (p. 86) . 



Testes (L. testis), the male sex-gland. 



Triton (Gr., a Greek marine god), a kind of newt. 



Trophoplasm (Gr. trophe, nourishment; plasma, form) (p. 57). 



Tunicata (L. tunica, a tunic), a class of animals covered with 



integuments, as sea-squirts, etc. 

 Type (Gr. typtein, to strike) (p. 154). 



Unicellular (L. unus, one; cellula, cell), one-celled. 

 Unilateral (L. unus, one; latus, side), one-sided. 



Vertebrata, vertebral (L. vertebra, a bone of the spine), back-boned 



animals. 

 Vesicle (L. vesica), a bladder. 



Volvocineee (L. volvere, to roll), an order of fresh-water algae. 

 Volvox (L. volvere, to roll), a small genus of fresh-water algae. 

 Vorticella (L. vortex, a whirl), a kind o:*^ infusorian. 



Xenia (Gr. xenos, guest) (p. 87). 



Zygote (Gr. zygon, yoke) (p. 124). 



