124 GLOSSARY. 



Rota'tores spi'nae (L. rotators of the spine). Eleven pairs of 

 small muscles, each passing from the transverse processes 

 of one vertebra to the next vertebra above. 



Rotifera (L. rota, a wheel ; fero, I carry). A group of micro- 

 scopic animals belonging to the division of the Tricho- 

 scolices. 



Ro'tula (L. a little wheel). Another name for the patella or 

 knee-pan. Also the name given to each of the radial pieces 

 connected with the mouth apparatus of the Echinidea. 



Ru'gae (L. wrinkles). A name given to certain temporary folds 

 of mucous membrane, as the rugoe of the stomach and of 

 the vagina. 



Rugo'sa (L. rugosus, wrinkled). A group of extinct corals. 



Ru'men (L. rumino, to chew the cud). The first stomach or 

 " paunch " of a ruminant. 



Ruminan'tia (L. riimino, to chew the cud). A division of the 

 Artiodactyla which comprises those animals which ru- 

 minate or " chew the cud." 



Eaccharomy'ces (Gr. sakcharon, sugar ; nntkcs, a fungus). The 

 yeast-plant 



Sac'culus (L. a small bag). The small division of the mem- 

 branous vestibule of the internal ear. An abnormal pro- 

 trusion of the mucous membrane of the bladder through 

 its muscular coat 



Sa'craL Relating to the region of the sacrum. 



Sa'cro-coccyge'us posticus. A small occasional bundle of 

 muscular fibres extending from the lower end of the 

 sacrum to the coccyx. 



Sa'cro-Iliac. The articulation of the sacrum with the ilium. 



Sa'cro-lumba'lis. A large muscle passing from the ilium to the 

 lower (posterior) ribs. 



Sa'cro-scia'tic. Applied to certain ligaments of the pelvis ; 

 also to two foramina left between these ligaments and the 

 os innominatum of each side. 



Sa'crum (L. sacred). The name given to the ankylosed 

 vertebrae of that region of the vertebral column which 

 immediately succeeds the lumbar region, and to which 

 the pelvic arch is articulated ; so named on account of its 

 being formerly in man an object of superstitious regard. 



