GLOSSARY. 79 



Marsu'pium (L. a pouch). The abdominal pouch in the 



Marsupialia. Also another name for the pecten of the eye. 

 Masse'ter (Gr. massaomai, I chew). One of the muscles of 



mastication, passing from the zygomatic arch to the lower 



jaw. 



Mas'tax (Gr. mouth). The muscular pharynx of the Rotifera, 

 Mastica'tion (Gr. masaomai, I chew). The process of chewing 



the food. 



Mas'ticatory (Gr. masaomai, I chew). Engaged in mastica- 

 tion ; applied to those organs which are engaged in 



chewing. 

 Mastfgopods (Gr. mastix, a whip ; pous, podos, a foot). A 



term applied to those Protozoa which possess cilia or 



flagella. 

 Mas'toid (Gr. mastos, a breast ; eidos, shape). Nipple-shaped. 



Applied to the process of the temporal bone behind the 



ear. 

 Mastof do-hu'meral muscle. A muscle which in some Verte- 



brata passes from the skull to the cervical region. 

 Mate'ria alimenta'ria (L. alimentary material). The materials 



of the food. 

 Ma'trix (L. a womb). The substance in which anything is 



embedded. 

 Maxilla (L. a jaw). In the Arthropoda, the lower pair or 



pairs of jaws ; in the Vertebrata applied to both upper and 



lower jaws, the principal bones of which are termed in- 

 ferior and superior ^maxillary respectively. 

 Maxil'liform (L. maxilla, jaw; forma, shape). Jaw-like; jaw- 

 shaped. 

 Maxil'lipede (L. maxilla, a jaw ; pes, pedis, a foot). Foot-jaws. 



The appendages of the Crustacea which serve both for 



masticatory and ambulatory purposes. 

 Maxillo-mandi'bular nerve. A division of the fifth cerebral 



nerve which supplies the maxilla and the mandible. 

 Maxillo-tur'binal. Another name for the inferior turbinated 



bone of the face. 

 Mea'tus (L. a way, path, passage). A small canal; as the 



external auditory meatus. 

 Hea'tus audito'rius exter'nus (L. external auditory canal). The 



passage which leads from the exterior to the tympanic 



membrane of the. ear. 

 Mea'tus urina'rius. The external opening of the female 



urethra. 



