336 GLOSSARY. 



ICH-THY-O-MOR'PHA (Gr. ichthus ; morphe, shape). An order of Amphibians, 



often called Urodela, comprising the fish-like frewts, etc. 

 ICH-THY-OPH-THI'BA (Gr. ichthus / phtheir, a louse). An order of Crustacea 



comprising animals which are parasitic upon Fishes. 

 ICH-THY -OP' SI-DA (Gr. ichthus; opsis, appearance). The primary division of 



Vertebrata, comprising the Fishes ana Amphibia. Often spoken of as the 



Branchiate Vertebrata. 

 ICH-THY-OP-TER-YG'I-A (Gr. ichthus; pterux, wing). An extinct order of 



Eeptiles. 

 ICH-THY-O-SAU'BI-A (Gr. ichthus ; saura, lizard). Synonymous with Ichthy- 



II/I-TJM. The haunch-bone, one of the bones of the pelvic arch in the higher 

 Vertebrates. 



I-MA'OO (Lat. for an image or apparition). The perfect insect, after it has 

 undergone its metamorphoses. 



IM'BRI-CA-TED. Applied to scales or plates which overlap one another like 

 tiles. 



IN-CI'SOR (Lat. incido, I cut). The cutting teeth fixed in the intermaxillary 

 bones of the Mammalia, and the corresponding teeth in the lower jaw. 



TN-E-QUI-LAT'ER-AL. Having the two sides unequal, as in the case of the 

 shells of the ordinary bivalves (Lamellibranchiata). When applied to the 

 shells of the Foraminifera, it implies that the convolutions of the shell do 

 not lie in the same plane, but are obliquely wound round an axis. 



IN-E'QUI- VALVE. Composed of two unequal pieces or valves. 



IN-FUN-DIB'U-LTJM (Lat. for funnel). The tube formed by the coalescence or 

 apposition of the epipodia in the Cephalopoda commonly termed the 

 " funnel," or " siphon." 



IN-FU-SO'RI-A (Lat. infusum, an infusion). A class of Protozoa, so called be- 

 cause they are often developed in organic infusions. 



IN'GUIN-AL (Lat. inguen, groin). Connected with, or situated upon, the groin. 



IH--O-PER-CU-LA'TA (Lat. ^n, without; operculum, a lid). The division of pul- 

 monate Gasteropoda in which there is no shelly or horny plate (operculum) 

 by which the shell is closed when the animal is withdrawn within it. 



IN-SEC'TA (Lat. inseco, I cut into). The class of Articulate animals commonly 

 known as Insects. 



IN-SEC-TIV'O-RA (Lat. insectum, an insect; voro, I devour). An order of 

 Mammals. 



IN-SEC-TIV'O-ROITS. Living upon Insects. 



IN-SES-SO'RES (Lat. insideo, I sit upon). The order of the Perching Birds, 

 often called Passeres. 



IN-TER-AM-BU-LA'CRA (Lat. inter, between ; ambulacrum, that which serves 

 for walking). The rows of plates in an Echinoderm, which are not per- 

 forated for the emission of the " tube-feet." 



IN-TER-MAX-IL'L^;, or PRJS-MAX-IL'LJS (Lat. inter, between; prce, before; 

 maxilla, the jaw). The two bones which are situated between the two 

 superior maxillae in Vertebrata. In man, and some monkeys, the prsemax- 

 illae anchylose with the maxillae, so as to be irrecognizable m the adult. 



IN-TUS-SUS-CEP'TION (Lat. mtu6 } within; suscipio, I take up). The act of 

 taking foreign matter into a living being. 



IN-VER-TE-BRA^TA (Lat. in, without ; vertebra, a bone of the back). Animals 

 without a spinal column or backbone. 



IS'CHI-UM (Gr. ischion, the hip). One of the bones of the pelvic arch in Ver- 

 tebrates. 



I-SOP'O-DA (Gr. isos, equal ; podes, feet). An order of Crustacea in which the 

 feet are like one another and equal. 



JU'GTJ-LAB (Lat. jugulum, the throat). Connected with, or placed upon, the 

 throat. Applied to the ventral fins of fishes when they are placed beneath 

 or in advance of the pectorals. 



KAI-NO-ZO'IO (Gr. Jcainos, recent ; zoe, life). The Tertiary period in Geology, 



