xxxviii GLOSSARY OF TECHNICAL TERMS 



SUSPENSOR (Lat. suspend ere, to hang up), a row of cells by which 



/the embryo is attached to the embryo sac in flowering plants. 

 MATIC (Gr. cruv, together ; dn-o, away from ; o-rj^a, signal), 



sharing a common warning colour. 

 SYNAPSIS (Gr. vvvatyis, conjunction), the pairing of chromosomes 



prior to nuclear reduction. 

 SYNCYTIUM (Gr. <rvv, together : KVTOS, cell), a layer of protoplasm 



not divided into separate cells but with many nuclei. 

 SYNDESIS (Gr. (rvvbrjaai, to bind together), another term for 



synapsis (q.v.). 

 SYNGAMY (Gr. crvv, together ; ydjuos, marriage), the sexual union 



of gametes (conjugation). 



TARSALS (Gr. rapo-os, foot [ankle]), the bones of the ankle. 

 TAXONOMY (Gr. raft?, arrangement ; vopos, law), the science of 



classification. 



TESTIS (Lat., testicle), an organ in which male gametes are pro- 

 duced ; a male gonad. 

 THYLACINE (Gr. QuXaKos, pouch ; KVWV, dog), a carnivorous 



marsupial (pouched mammal) found in Tasmania. 

 TIBIA (Lat., shin-bone), one of the bones of the leg. 

 TORPEDO (Lat., numbness, electric ray), a kind of ray, with 



powerful electric organs. 

 TRIASSIC (Gr. rpids, three), the earliest epoch of the mesozoic era, 



so-called from the three-fold subdivision seen in Germany. 

 TRICHOCYSTS (Gr. 0/oi'f, hair; KVO-TIS, pouch), minute sacs con- 



taining hair-like processes (in Paramoecium, &c.). 

 TRILOBITE (Gr. r/oety, three ; Ao/3o's, lobe), an extinct crustacean 



of the paleozoic era. 

 TURBELLARIAN (Lat. turbella, stir), a kind of flat worm whose 



ciliated surface stirs up the water. 

 ULNA (Lat., arm), one of the bones of the forearm. 

 UNGULATE (Lat. ungula, hoof), a hoof -bearing animal of the order 



Ungulata. 



UNGULIGRADE (Lat. ungula, hoof ; gradus, step), walking on the hoof. 

 UNICELLULAR (Lat. unus, one ; cellula, cell), consisting of a single 



cell. 

 UNISEXUAL (Lat. unus, one ; sexus, sex), either male or female, not 



hermaphrodite. 

 UREA (Gr. ovpov, urine), a nitrogenous compound formed as a 



waste product in animal bodies. 

 UTERUS (Lat., womb), an enlarged portion of the oviduct, in 



