GLOSSARY OF TECHNICAL TERMS. 357 
Ilium. Anterior dorsal pelvic bone. 
Imbricate. Overlapping. 
Imperforate. Not pierced through. 
Inarticulate. Not jointed. 
Incisors. Front cutting teeth. 
Infralabial plates. Under scaly labial plates, or those below mandibular 
labials, in lizards. 
Inframarginal shields. ‘The first and last shields of the bridge, on the plastron 
of turtles. 
Infraoral. Below mouth. 
Infundibulum. A funnel-like prolongation from the floor of the diencephalon. 
Inscriptiones tendinee. ‘Transverse bands of fibrous tissue traversing at in- 
tervals the extensores dorsi and rectus abdominis muscles. 
Interclavicle. A median ventral membrane bone connected on each side with 
clavicle, extending backwards ventral to sternum. 
Interfrontonasal plate. A scaly plate in lizards, between the internasals and 
prefrontals. 
Intergular shield. Usually the first, a single shield, at the front of the plas- 
tron of turtles. 
Intermedium. Carpal bone between end of ulna and radius, and tarsal bone 
between end of tibia and fibula. 
Internasal plates. A pair of scaly plates behind the rostral and between the 
nasals, in lizards and snakes. 
Interorbital. Between eyes. 
Interparietal plates. A narrow scaly plate separating the parietals in lizards. 
Interposition. Placed between. 
Iris. A circular pigmented membrane placed behind the cornea and presenting 
the characteristic color of the eye. 
Ischium. Posterior dorsal pelvic bone. 
Iter. Aqueduct of Sylvius, or median portion of the mesoccele. 
Jacobson’s organ. An offshoot from the olfactory organ, opening into the 
mouth. 
Jugal. A bone of the zygomatic arch. Malar bone. 
Jugular. Relating to the lower throat. 
Jugular veins. Veins on the sides of the head carrying the blood to the pre- 
caval vein. 
Keeled. Furnished with a ridge along the median line. 
Kidney. A massive gland of deep red color, secreting the urine. 
Labials. Plates along each lip in serpents. 
Lachrymal. Preorbital bone. 
Lacustrine. Living in lakes. 
Lamelle, Plate-like processes. 
Lamina. Plate. Bony roof of the neural canal. 
Lamina terminalis. Thin front wall of the diencephalon. 
Larva, An immature form which must undergo change of appearance before 
becoming adult. 
