GLOSSARY. 119 



Py'gal (Gr. puge, the buttocks). A term applied to the 



posterior plates of the dorsal shield of the Chelonia. 

 Pygi'dmm (Gr. puge t the rump). The terminal segment of the 



body in the Polychaeta; also the posterior part of the 



carapace of a Trilobite. 

 Py'gostyle (Gr. puge, the rump; stulos, a style, pen). The 



ploughshare-shaped bone which supports the tail feathers 



in most birds. 

 Pylan'gium (Gi.pule, gate, inlet; angeion, a vessel). The first 



or receiving part of the truncus arteriosus of the lower 



Vertebrata. 

 Pylo'ric cae'ca (L. ctzcus, blind). Blind diverticula of the 



intestine in Teleostean fishes; also similar diverticula of 



the ventriculus in some insects. 

 Pylo'rus (Gr. pulouros, a gate-keeper). The opening of the 



stomach which leads into the intestine. 

 Pyramidalis abdo'minis (L. pyramidal of the abdomen) . A small 



muscle arising from the pubis, and inserted in the linea alba. 

 Pyramidalis na'si (L. pyramidal of the nose). A muscle of 



the nose. 



Pyrex'ia (Gi.pur, fire; echo, to hold). Fever. 

 Py'riform (L. pyrus, a pear ; forma, shape). Pear-shaped. 

 Pyrifor'mis (L. pear-shaped). A muscle passing from the 



pelvis to the great trochanter of the femur. 



Q- 



Quad'rate bone (L. quadratus, square, quadrangular). A bone 



by which the lower jaw is articulated to the skull in all 



Vertebrata below Mammals. 

 Quad'rato-ju'gal (L. quadratus, square ; jugum, a yoke). A 



bone of the face lying behind the maxillary and jugal bones 



in some Vertebrata ; in others a bone formed by the union 



of the quadrate and jugal bones. 

 Quadra'tus fe'moris (L. square [muscle] of the femur). A 



muscle passing from the ischium to the femur. 

 Qnadra'tus lumbo'rum (L. square [muscle] of the loins). A 



muscle placed between the last rib and the crest of the 



ilium, close to the vertebral column. 

 Quadra'tus men'ti (L. square [muscle] of the chin). A muscle 



which by its contraction depresses the lower lip. 

 Quad'riceps exten'sor (L. four-headed extender). The extensor 



muscle of the knee. 



