INDEX-GLOSSARY. 383 



Macronucleus (/xa/cpd, large ; nucleus), 72. 



Macrozooid (M^'POS; woi/, a living creature), 15, 72. 



Macula (macula, a spot), in the membranous labyrinth One of several 



sensory patches situated in the utriculus, sacculus, and (when rudi- 

 mentary) the cochlea, 221. 

 Madagascar, 348, 349. 

 Malacca, 349. 

 Malpighian Body, in the Kidney A Bowman's capsule with its glomerulus, 



206, 295. 



Malpighian layer, 177. 

 Mammalia, 345; Chap, xii., 268, et seq. : Distribution of, 357; Origin of, 



357. The lower jaw, 183, 236, 276, 325. 

 Man = Homo, q.v. 

 Mandible In Crustacea : the third pair of head appendages, which act as 



jaws, 89. 

 Mantle, in Mollusca A flap-like outgrowth of the body- wall which usually 



shelters the gills, 111. 

 Manubrium-(l) A process of the sternum, 238, 280, 326; (2) a process 



of the mallens, 273. 



Manus The hand, 176, 186, 230, 239, 281. 

 Marmot, 349. 



Marrow The central soft tissue contained within bone, 188, 293. 

 Marsupialia, 346, 349, 352, 354. 



Mastoid A term applied to the spongy part of the periotic, 32, 273. 

 Matrix Intercellular substance in which tissue elements are imbedded, 



126, 188. 

 Maxilla (maxilla, a jaw) (1) In Crustacea : one of the second or third 



jaw-like appendages belonging to the head, 89 ; (2) In Vertebrata : one 



of the membrane bones of the upper jaw, 182, 234, 275, 325. 

 Maxillipede A flattened jaw-like appendage belonging to the head, 89. 

 Meatus (meatus, a passage) External auditory m., 230, 255. 

 Mediastinum A median partition in the thorax, formed by the apposition 



of the parietal layers of the two pleurae, 294. 

 Medulla In nerve fibre : the fatty layer surrounding the axis cylinder, 



81 ; m. of hair, 270 ; m. of kidney, 295. 

 Medulla oblongata The axial part of the hind-brain ; the bulb, 169, 211, 



216, 253, 302. 

 Medusa, 27. 

 Membrane Arachnoid, 210; m. granulosa, 299; Mucous, 189, 192,244, 



