GLOSSARY. 129 



Sep'tum transver'sum (L. transverse partition). An incom- 

 plete partition in the ampullae of the semicircular canals 

 of the ear. 



Seques'trum (L. sequestra, I set aside). A dead portion of 

 bone separated, or destined to separate, from the living 

 parts. 



Se'rous (L. serum, the watery part of curdled milk). A term 

 applied to those membranes which, forming shut sacs, 

 secrete a watery fluid similar to the serum of blood. 



Serra'ted su'ture (L. serra, a saw; sutura, a seam). A term 

 applied to the fixed joints, where the margins of the con- 

 nected bones are notched and saw-like. 



Serra'tus mag'nus (L. great saw-like muscle). A large muscle 

 of the thorax, stretching from the lateral surface of the ribs 

 to the scapula. 



Serra'tus posti'cus infe'rior (L. inferior posterior saw-like mus- 

 cle). A muscle which passes from the lumbar region to 

 the ribs. 



Serra'tus posti'cus supe'rior(L. superior posterior saw-like mus- 

 cle). A muscle passing from the spines of the last cervical 

 and upper dorsal vertebrae to the ribs. 



Se'rum (L. the watery part of curdled milk). The fluid part of 

 blood, /. e, blood minus its corpuscles and fibrin-factors. 



Se'samoid (Gr. sesamon, a kind of small grain; eidos, shape). 

 A term applied to those small bones, such as the patella, 

 which are formed in tendons. 



Ses'sile (L. sedeo, I sit). Not supported upon stalks; the 

 opposite of pedunculated. 



Se'tae (L. seta, a bristle). Bristle-like processes from the body 

 segments of the worms. 



Se'tose (L. seta, a bristle). Bristly. 



Sig'moid (Gr. the letter S [sigma] ; eidos, shape). Applied to 

 the flexure of the intestine, which is something like the 

 letter sigma; also sometimes applied to the semilunar 

 valves of the aorta and pulmonary artery. 



Siliceous (L. silex, flint). Composed of flint. 



Siluroi'dei (Gr. silouros, the shad; eidos, shape). A family of 

 the Physotomi, a group of Teleostean fishes. 



Sfmiadae (L. slmia, an ape). A division of the Primates which 

 includes the apes and monkeys. 



Slnupal'liate (L. sinus, a bending, curve ; pallium, a mantle). 

 A term applied to those Lamellibranchs iu which the 

 pallial line is notched. 



