380 GLOSSARY. 



Imbricated. (Lat. i/nbricatus, tiled.) Scales which lie one upon another like 

 tiles. 



Ingluvies. a crop or partial dilatation of the oesophagus. 



Inopercular. Univalve shells which have no operculum or lid. 



Instrumenta Cibaria. (Lat. cibus, food.) The parts of the mouth in insects con- 

 cerned in the acquisition and preparation of the food. 



Interambulacra. The imperforate plates which occupy the intervals of the per- 

 forated ones, or ambulacra, in the shells of the Echinoderms. See Ambulacra. 



Interganglionic. (Lat. JH^er, between ; and ga7iglion.) The nervous chords in the 

 intervals of the ganglions, which they connect together. 



Interstitial. (Lat. interstitium.) Relating to the intervals between parts. 



Intr-auterine. (L.at. intra, within; uterus, the womb.) The development of the 

 embryo which takes place within the womb. 



Intussusception. CLat. uitus, within; suscipio, I take up.) When part of a 

 tube is inverted within a contiguous part. 



Invertebrata. (Lat. in, used in composition to signify 7iot, like un ; vertebra, a bone 

 of the back. ) Animals without back-bones. 



IsocYCLUs. ( Gr. W05, equal ; kuMos, a rmg.) An animal composed of a succession 

 of equal rings. 



IsoPODA. (Gr. isos, equal ; pous, a foot.) An order of Crustaceans in which the 

 feet are alike, and equal. 



Labium. Latin for a lip ; but applied only to the lower lip in Entomology. 

 Labrum. Latin for a lip ; but applied only to the upper lip in Entomology. 

 Lamellibranchiata. {\uat. lamella, a plate ; bragchia, g\\\?,.) The class of ace- 

 phalous Mollusks with gills in the form of membranous plates. 

 Lamelliform. Shaped like a thin leaf or plate. 

 Laniariform. (Lat. lanio, to cut or tear; forma, shape.) Shaped like the 



canine teeth of the Carnivora, which are called laniaries from their office. 

 Larva. (Lat. larva, a mask. ) Applied to an insect in its first active state, 



which is generally different from, and as it were masks the ultimate form. Larvi- 



form, shaped like a larva. 

 Larviparous. (Lat. larva; pario, I produce.) The insects which produce their 



young in the condition of larva;. 

 Lemniscus. (The Latin for riband. ) Applied to the minute riband-shaped appendages 



of the generative pores in Entozoa. 

 Lepidoptera. (Gr. lepis, a scale; pteron, a wing.) The order of insects in which 



the wings are clothed with fine scales, as butterflies and moths, 



Macroura. (Gr. makros, long ; oura, tail.) The tribe of decapod Crustacea which 

 have long tails, as the lobster. 



Malacology. {Gy. makikos, soft; logos, discourse.) The history of the soft- 

 bodied or molluscous animals, which were termed Malakia by Aristotle. 



Malacostraca. (Gt. ynalakos ; ostrakon, a shell.) The name given by Aristotle 

 to the modern Crustacea, because their shells were softer than those of the Mol- 

 lusca, or ordinary shell-fish. 



Mammalia. (L.at. matiwia, a breast.) The class of animals which give suck to 

 their young. 



Mandibulata, CLat, mandibula, a jaw.) The insects which have mouths pro- 

 vided with jaws for mastication ; the term mandible is restricted in Entomology 

 to the upper and outer pair of jaws. 



Mantle. The external soft contractile skin of the Mollusca, which covers the 

 viscera and a great part of the body like a cloak. 



Marsupial. (Lat. marsupium, a purse.) The tegumentary pouch, in which the 

 embryo is received after birth, and protected during the completion of its de- 

 velopment. 



Mastodon. (Gr. mastos, a teat; odon, a tooth.) A genus of extinct quadrupeds 

 allied to the elephant, but having the grinders covered with conical protuberances 

 like teats. 



Maxilla. (From the Latin for a jaw.) In Entomology restricted to the inferior 

 pair of jaws. 



