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, i. 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 2, [sigmd\ ; etdos, 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. 



Sili'ceous (L. silex, flint). Composed of flint. 



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

 the Physotomi, a group of Teleostean fishes. 



Si'miadae (L. stmia, an ape). A division of the Primates which 

 includes the apes and monkeys. 



Sinupal'liate (L. smus, a bending, curve ; pallium, a mantle). 

 A term applied to those Lamellibranchs in which the 

 pallial line is notched. 



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