GLOSSARY. 65 



Hypochon'drium (Gr. hupo, under; chondros, gristle). The 



upper lateral region of the abdomen which is covered by 



the costal cartilages. 

 Hypoclei'dium (Gr. hitpo, under; kleis, kleidos, collar-bone). 



A median process developed in some birds from the 



interclavicular portion of the furculum. 

 Hypogas'trimn (Gr. hupo, under; gaster, the belly). The 



lower mesial region of the abdomen. 

 Hypoglos'sal (Gr. hypo, under; glossa, the tongue). Under 



the tongue, as the hypoglossal (twelfth pair of) cerebral 



nerves. 

 Hypopharynge'al (Gr. hupo, under; pharunx, the throat). 



Under the pharynx. Applied to a band of cilia beneath 



the pharynx in some Ascidioida. 

 Hypopha'rynx (Gr. hupo, under; pharunx, the throat). In 



some Insecta a free process of the posterior wall of the 



buccal cavity, (also termed the lingua.} 

 Hypo'physis ce'rebri (Gr. hupo, under ; phuo, I grow ; L. cerebrt, 



of the brain). Another name for the pituitary body. 

 Hypoplas'tron (Gr. hupo, under). The third lateral piece of 



the plastron in the Chelonia. 

 Hypora'chis (Gr. hupo, under; rachis, a spine, ridge). The 



second vexillum or aftershaft of the feathers in some birds. 

 Hyposke'letal (Gr. hupo, under). Under the skeleton; ap- 

 plied to those muscles which are developed below the 



endoskeleton. 



Hypospa'dias (Gr. hupo, under; spao, I draw out). An abnor- 

 mal condition of the male urethra. 

 Hypotar'sus (Gr. hupo, under; tarsos, the flat of the foot). A 



process developed in most birds from the adjacent parts 



of the middle tarsal and metatarsal bones. 

 Hypo'thenar (Gr. hupo, under; thenar, the palm). Applied 



to the fleshy eminence at the inner border of the hand. 

 Hypotrlcha (Gr. hupo, under; thrix, trtchos, hair). A group 



of the Ciliata in which the cilia are confined to the under 



surface of the body. 

 Hypoxan'thin(Gr./^?, under ; xanthos, yellow). A substance, 



(also named sarkin,) obtained from muscular tissue. 

 Hypu'ral (Gr. hupo, under ; oura, the tail). The bones which 



support the caudal fin-rays in fishes. 

 Hyracoi'dea (Gr. eidos, shape). A group of the Zonaria, 



(deciduate mammals,) represented by the single genus 



Hyrax. 



