GLOSSARY. 803 



INSESSORES (Lat. insedeo, I sit upon). The order of the Perching Birds, often 

 called Passeres. 



INTERAMBULACRA. The rows of plates in an Echinoderm which are not per- 

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



INTERMAXILLJB or PR^MAXILLJE. The two bones which are situated between 

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

 pnemaxillae anchylose with the maxillae, so as to be irrecognisable in the 

 adult. 



INTUSSUSCEPTION (Lat. inhis, within ; suscipio, I take up). The act of taking 

 foreign matter into a living being. 



IN VERTEBRATA (Lat. in, without ; vertebra, a bone of the back). Animals 

 without a spinal column or backbone. 



TSCHIUM (Gr. ischion, the hip). One of the bones of the pelvic arch in Verte- 

 brates. 



[SOPODA (Gr. isos, equal ; podes, feet). An order of Crustacea in which the 

 feet are all like one another and equal. 



JUGULAR (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. 



KAINOZOIC (Gr. kainos, recent ; zo$, life). The Tertiary period in Geology, 



comprising those formations in which the organic remains approximate more 



or less closely to the existing fauna and flora. 

 KERATODE (Gr. keras, horn ; eidos, form). The horny substance of which the 



skeleton of many Sponges is made up. 

 KERATOSA. The division of Sponges in which the skeleton is composed of 



keratode. 



LABIUM (Lat. for lip). Restricted to the lower lip of Articulate animals. 



LABRUM (Lat. for lip). Restricted to the upper lip of Articulate animals. 



LABYRINTHODONTIA (Gr. laburinthos, a labyrinth ; odous, tooth). An extinct 

 order of Amphibia, so called from the complex microscopic structure of 

 the teeth. 



LACERTILIA (Lat. lacerta, a lizard). An order of Reptilia comprising the 

 Lizards and Slow-worms. 



LJEMODIPODA (Gr. laimos, throat ; dis, twice ; podes, feet). An order of Crus- 

 tacea, so called because they have two feet placed far forwards, as it were 

 under the throat. 



LAMELLIBRANCHIATA (Lat. lamella, a plate ; Gr. bragchia, gill). The class of 

 Mollusca, comprising the ordinary bivalves, characterised by the possession 

 of lamellar gills. 



LAMELLIROSTRES (Lat. lamella, a plate ; rostrum, beak). The flat - billed 

 Swimming Birds (Natatores), such as Ducks, Geese, Swans, &c. 



LARVA (Lat. a mask). The insect in its first stage after its emergence from 

 the egg, when it is usually very different from the adult. 



LARYNX. The upper part of the windpipe, forming a cavity with appropriate 

 muscles and cartilages, situated beneath the hyoid bone, and concerned in 

 Mammals in the production of vocal sounds. 



LENTICULAR (Lat. lens, a bean). Shaped like a biconvex lens. 



LEPIDOPTERA (Gr. lepis, a scale ; pteron, a wing). An order of Insects, com- 

 prising Butterflies and Moths, characterised by possessing four wings which 

 are usually covered with minute scales. 



LEPIDOTA (Gr. lepis, a scale). Formerly applied to the order Dipnoi, con- 

 taining the Mud-fishes (Lepidosiren). 



LEPTOCARDIA (Gr leptos, slender, small ; cardia, heart). The name given by 

 Mliller to the order of Fishes comprising the Lancelot, now called Pharyn- 

 ffolranchii. 



LIGAMENTUM NUCILE (Lat. nucha, the nape of the neck). The band of elastic 

 fibres by which the weight of the head in Mammalia is supported. 



LINGUAL (Lat. lingiw, the tongue). Connected with the tongue. 



LISSENCEPHALA (Gr. lissos, smooth ; egkephalos, brain). A primary division 



