GLOSSARY. 67 



Impres'sio renalis (L. impression of the kidney). A shallow 



impression on the under surface of the liver, corresponding 



with the right kidney. 

 Inarticula'ta (L. in t not; artlculus, a joint). A group of the 



Brachiopoda in which the valves of the shell have no 



hinge. 



Inci'sor (L. incldo, I cut into). A cutting tooth. 

 Inci'sura (L. a notch). A small opening or notch. 

 Inci'sura of aceta'bulum. A notch left in the acetabulum 



where the margin is incomplete. 



Inci'sura ethmoida'lis (L. ethmoid notch). A small notch sepa- 

 rating the orbital plates of the frontal bone. 

 Inci'sura intertra'gica (L. the notch between the tragi). The 



notch which separates the tragus and antitragus of the 



external ear. 

 Inci'sura semiluna'ris (L. semilunar notch). The middle of the 



three notches in the upper border of the sternum. 

 Incuba'tion (L. incubatio^ a sitting upon eggs). The process of 



hatching. Applied also to the germination of infectious 



diseases, &c. 

 In'cus (L. an anvil). The middle of the three ossicles of the 



tympanum of the ear. Also the central portion of the 



armature of the pharynx in the Rotifera. 

 In'dex (L. the fore-finger). Applied to the second digit of the 



manus. 

 Indu'sium (L. induere, to clothe). The epidermic covering of 



the sporangia in some ferns. 

 In'fra-bran'chial (L. infra, beneath ; Gr. branchia, a gill). 



Applied to the ventral division of the pallial chamber in 



the Larriellibranchiata, it being below the gills. 

 Infraspina'tus (L. beneath the spine). A muscle running from 



the scapula to the head of the humerus. 

 Infundi'bulum (L. a funnel). A process passing from the floor 



of the third ventricle of the brain to the pituitary body. 



Also a tubular organ in the Cephalopoda through which 



the water is driven from the gills. Also a chamber in the 



Ctenophora into which the gastric sac leads. 

 Infuso'ria (L. in, on ; fundo, I pour). A division of the 



Protozoa found abundantly in infusions of animal or 



vegetable material. 



Inglu'vies (L. the crop of a bird). The crop. 

 Ingu'inal (L. inguen, the groin). Relating to the region of 



the groin. 



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