78 GLOSSARY. 



membrane, on the other with the incus. Also the name of 



each lateral piece of the armature of the pharynx in the 



Rotifera. 

 Mallo'phaga (Gr. mallos, lock of hair ; phago, I eat). A family 



of insects parasitic upon mammals and birds, and which 



feed upon the feathers and hair. 

 Malpi'ghian cap'sules (L. capsules of Malpighi). The dilated 



extremities of the uriniferous tubules of the kidney. 

 Malpi'ghian corpus'cles (L. corpuscles of Malpighi). Rounded 



collections of nucleated corpuscles found in the spleen. 

 Mammalia (L. mamma, the breast). The class of Vertebrata 



which includes all those animals which suckle their young. 

 Mam'mary glands (L. mamma, the breast). The glands in the 



Mammalia which secrete milk for the nutrition of the 



young ; the breasts. 

 Mam'millary (L. mamma, the breast). A name applied to 



the tubercles or metapophyses of the vertebrae. 

 Man'dible (L. mando, I chew). In the Vertebrata, the lower 



jaw ; in the Arthropoda, the upper pair of jaws ; in the 



Cephalopoda, the beak; in birds sometimes applied to 



both rostra of the beak. 

 Manu'brium (L. a handle). The handle-shaped sac which is 



suspended from the centre of the disc in the Medusae. 



Applied, in the Vertebrata, to the handle-like process of the 



malleus and of the sternum ; in Chara, the process which 



projects into the antheridium from each of its eight pieces. 

 Ma'nus (L. the hand). The terminal segment of the anterior 



extremity, which in man forms the hand. 

 Mar'ginal bones. The name given to certain added bones on 



the radial and ulnar edges of the manus in the Ichthyo- 



sauria. 



Mar'ginal gy'rus. One of the convolutions of the brain. 

 Mar'go acu'tus (L. acute margin). ^The right or lower border of 



the heart. 

 Mar'go obtu'sus (L. obtuse margin). The upper or left border 



of the heart. 

 Marsrpobran'chii (Gr. marsipos, a purse, bag ; branchia, a gill). 



An order of fishes which includes the Lampreys, Hags, 



&c., which have pouch-like gills. 



Harsupialia (L. marsupium, a pouch). An order of Mam- 

 malia provided with an abdominal pouch for the reception 



of the young, which are brought forth at a very early stage 



of development. 



