GLOSSARY. 59 



GlycochS'lic acid (Gr. glukus, sweet ; chole, bile). An acid 



obtained from bile. 



Gly'cogen (Gr. glukus, sweet ; gennao, I bring forth). A sub- 

 stance secreted by the liver, which is readily convertible 



into grape-sugar or glucose. 

 Glyptodon'tidae (Gr. gluptos, carved; odous, odontos, a tooth). 



A division of the Edentata which contains the single genus 



Glyptodon, which has its teeth deeply grooved. 

 Gna'thites (Gr. gnathos, a jaw). The antennary and mastica- 

 tory appendages of the Arthropoda. 

 Gnathos'tegite (Gr. gnathos, a jaw; stege, a covering). A 



broad plate, developed from the third thoracic appendages 



of the Brachyura, which forms a cover for the other organs. 

 Gompho'sis (Gr. gomphos, a nail). A term sometimes applied 



to the articulation of the teeth in their sockets. 

 Gonan'gium (Gr. gone, seed, offspring ; angeion, a receptacle). 



A structure developed in the Hydrophora, in which the 



reproductive elements are produced. 

 Gonapo'physes (Gr. gone, seed; apophuo, to sprout). Two 



pair of elongated processes developed from the eighth and 



ninth somites of the cockroach. 

 Gonoblasti'dium (Gr. gone, seed ; blastano, to sprout, grow). 



A structure which, in some Hydrozoa, bears upon separate 



branches the male and female gonophores. 

 Gon'ophore (Gr. gone, seed; phoreo, I bear). A structure in 



which, in the Hydrozoa, the reproductive elements are 



developed. 



Gra'cilis (L. slender). A muscle of the hind limb. 

 Gral'lae (L. stilts). According to the old system of classifica- 

 tion, an order of birds which included the plovers, cranes, 



flamingoes, and storks. 

 Gra'nules (L. diminutive of granum, a grain). Small particles 



found in cells, &c. 

 Grap'tolite (Gr.grapho, I write; lithos,& stone). An extinct 



group of Hydrozoa. 

 Gra'vid (L. grdvidus, heavy, pregnant). Applied to the uterus 



when pregnant. 



Gregari'nidae (L. grex, a flock). A group of the Protozoa. 

 Guard. The fibrous sheath which covers the phragmacone of 



the Belemnites. 

 Guberna'culum tes'tis (L. pilot of the testicle). The cord and 



serous fold which guide the testicle in its descent into the 



scrotum before birth. 



