GLOSSARY. 97 
Interclavicula L. zzfer, between ; clavicu/a, the collar- 
bone)—A median membrane bone between 
the clavicles in many Vertebrata, also termed 
the epzsternum. 
Intererural (L. zzzer, between).—A term applied to 
additional neural arches, when more than 
one is present on each vertebra. 
Intermaxillary (L. zv¢er, between).—A name some- 
times applied to the premaxillary bones. 
Intermedium (L. zz¢ermedius, intermediate).—A bone 
of the carpus, also termed centrale. 
Interoperculum (L. z7Zer, between ; operculum, a lid). 
—A bone in fishes lying between the oper- 
culum and preoperculum. 
Interspinous (L. zz¢er, between).— Between the spines. 
Applied particularly to certain bones on the 
dorsal fin of fishes developed between the 
spines of the vertebre. 
Ischium (Gr. zschzon, the hip).—A bone of the pelvic 
cirdle. 
Jugal (L. jugum, a yoke).—A name applied to the 
malar or cheek bone. 
Jugular (L. 7ugulum, the fore-part of the neck),—Per- 
taining to the neck. Used to denote the 
position of ventral fins in some fishes, when 
they are situated in front of the pectoral fins. 
Lachrymal (L. /achryma, a tear)—Applied to a bone 
on either side of the face, through which the 
lachrymal duct passes from the eye to the 
nostrils ; the os wuguzs of some authors. 
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