104 GLOSSARY. 
Os ealcis (L. the heel-bone)—Another name for the 
calcaneum. 
Os cloace (L.the bone of the cloaca)—A bone support- 
ing the front wall of the cloaca in some 
Lacertilia. 
Os coxe (L. the hip bone).—Another name for the 
ennominate bone of the pelvic girdle. 
Os en ceinture (Fr. girdle bone).—A peculiar cartilage 
bone in the frog’s skull. 
Os innominatum (L. a nameless bone).—In the higher 
Vertebrata the large bone of the pelvis, 
formed by the coalesence of the ilium, ischium, 
and pubis. 
Os lingue (IL. bone of the tongue).—Synonymous, 
with the hyoid bone. 
Os magnum (L. large bone)—A bone of the carpus 
known also as the capzetatum. 
Os odontoideum (L. tooth-shaped bone).—The peg- 
like bone, anchylosed with the second verte- 
bra in the higher Vertebrata, on which the 
head rotates. 
Os orbiculare or lenticulare (L. orbicular or lentil 
shaped bone).—A name formerly used for 
the tubercle of the incus, in human anatomy 
known as the lenticular process of the incus. 
Os penis (L. penis bone)—A bone in the penis of 
certain Vertebrata. 
Os planum (L. flat bone)—Another name for the 
orbital surface of the ethmoid bone, or the 
external boundary of the ethmo-turbinals. 
