70 GLOSSARY. 



Ischia'tic (Gr. ischion^ the hip). Relating to the region of the 



hip. 

 Is'chio-cauda'lis (Gr. ischion, the hip ; cauda, a tail). A 



muscle which in some mammals passes from the anterior 



chevron bones of the tail to the ischium. 

 Ischio'cerite (Gr. ischion, the hip; kerns, a horn). The third 



joint of the antennae in the Crustacea. 

 Ischio'podite (Gr. ischion, the hip ; pous, podos, a foot). The 



third joint of the typical appendage in the Crustacea. 

 Is'chium (Gr. ischion, the hip). One of a pair of bones in the 



pelvic girdle, which in man forms the lower and hinder 



portion of each innominate bone. 

 Iso'poda (Gr. isos, equal ; pous^podos, a foot). A group of the 



Edriophthalmia in which the feet are similar and equal. 

 I'ter a ter'tio ad quar'tum ventri'culum (L. passage from the 



third to the fourth ventricle). The passage by which the 



third and fourth ventricles of the brain communicate, 



commonly termed the tier. 



j. 



Jeju'num (L. jejunus, empty). The second portion of the 

 small intestine. 



Ju'gal (L. jiigum, a yoke). Another name for the malar or 

 cheek bone. 



Ju'gular (L. jugulum, the fore-part of the neck). The name 

 given to the large veins in the neck which bring the blood 

 from the head to the superior vena cava. A term also 

 applied to the position of the ventral fins of fishes when 

 they are placed in front of the pectoral fins. 



Ju'gulo-cepha/lic vein (L.jugulum, the fore-part of the neck; 

 Gr. kephale, the head). A branch sometimes uniting the 

 jugular and cephalic veins. 



K. 



Ke'ratin (G. keras, a horn). A nitrogenous substance enter- 

 ing largely into the composition of hair, nails, horn, &c. 



Ze'ratose (Gr. keras, a horn). A tough, horny, animal sub- 

 stance entering into the composition of the skeleton of 

 sponges and other Invertebrata. 



