TOO GLOSSARY. 
angular elevation of the mandible forming 
the chin, and peculiar to the human skull. 
Mental spines.—A name applied to two pairs of 
prominent tubercles on the mandible for the 
attachment of muscles. 
Mento-meckelian element (L. mentum, the chin).— 
Applied to that portion of Meckel’s cartilage 
which becomes ossified and forms the chin. 
Mesethmoid (Gr. mesos, middle; ethmos, a_ sieve ; 
e7dos, shape).—The vertical plate of the 
ethmoid bone in man, a cartilage in the 
lower Vertebrata. 
Mesopterygium (Gr. esos, middle ; prerux,a wing).— 
The median basal cartilage in the pectoral 
fin of the Elasmobranchii. 
Meso-pterygoid (Gr. sesos, middle ; pterwx, a wing).— 
A bone Jor the skull “in ycertain= sishes 
(Teleostei). 
Meso-seapula (Gr. mesos, middle; L. scapula, the 
shoulder-blade)—A term sometimes applied 
to the spine of the scapula. 
Meso-sternum (Gr. wzesos, middle ; sternon, the chest). 
—The middle portion of the sternum, some- 
times termed the gladzolus. 
Metacarpal (Gr. meta, beyond ; karpos, the wrist).— 
Applied to each bone of the metacarpus. 
Metacarpus (Gr. meta, beyond ; karpos, the wrist).— 
That part of the manus situated between the 
wrist and the fingers. 
Metacromion (Gr. me¢a, beyond ; akron, the summit ; 
