GLOSSARY. 337 



comprising those formations in -which the organic remains approximate 



more or less closely to the existing fauna and flora. 

 KER'A-TODE (Gr. keras, horn; eidos, form). The horny substance of which 



the skeleton of many sponges is made up. 

 KER-A-TO'SA. The division of Sponges in which the skeleton is composed 



of keratode. 



LA'BI-UM (Lat. for lip). Restricted to the lower lip of Articulate animals. 

 LA'BEUM (Lat. for lip). Restricted to the upper lip of Articulate animals. 

 LAB-Y-RINTH-O-DON'TI-A (Gr. laburinthos, a labyrinth ; odous, tooth). An 



extinct order of A mphibia, so called from the complex microscopic structure 



of the teeth. 

 LAC-ER-TIL'I-A (Lat. lacerta, a lizard). An order of Reptilia comprising the 



Lizards and Slow-worms. 

 L^E-MO-DIP'O-DA (Gr. laimos, throat ; dis, twice ; podes, feet). An order of 



Crustacea, so called because they have two feet placed far forward, as it 



were under the throat. 

 LA-MEL-IJ-BRANCH-I-A'TA (Lat. lamella, a plate; Gr. bragchia, gills). The 



class of Mollusca, comprising the ordinary bivalves, characterized by the 



possession of lamellar gills. 

 LA-MEL-LI-ROS'TRES (Lat. lamella, a plate ; rostrum, beak). The flat-billed 



Swimming Birds (Natatores], such as Ducks, Geese, Swans, etc. 

 LAR'VA (Lat. for a mask). The insect in its first stage after its emergence 



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

 LAR'TNX. 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. 

 LEN-TIC'U-LAR (Lat. lens, a bean). Shaped like a biconvex lens. 

 LEP-I-DOP'TE-RA (Gr. lepis, a scale ; pteron, a wing). An order of Insects, 



comprising Butterflies and Moths, characterized by possessing four wings 



which are usually covered with minute scales. 

 LEP-I-DO'TA (Gr. lepidotos, covered with scales). Formerly applied to the 



order Dipnoi, containing the Mud-fishes (Lepidosireri). 

 LEP-TO-CAR'DI-A (Gr. leptos, slender, small; Icardia, heart). The name given 



by Miiller to the order of fishes comprising the Lancelot, now called Pha- 



ryngobranchii. 

 LIG-A-MEN'TUM NTJ'CBLE (Fr. nuque, the nape of the neck). The band of elastic 



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

 LIN'GUAL (Lat. lingua, the tongue). Connected with the tongue. 

 LIN'GU-LA (Lat. lingula, a little tongue). The upper flexible portion of the 



labium or lower lip in Insects. 

 LIS-SEN-CEPH'A-LA (Gr. lissos, smooth ; eglcephalos, brain). A primary division 



of Mammalia, according to Owen, in which the cerebral hemispheres are 



smooth or have few convolutions. 



LITH'O-CYSTS (Gr. Uthos, a stone ; Jcustis.z cyst). The sense-organs or "mar- 

 ginal bodies" of the Lucernarida or SteganopMhalmate Medusae,. 



LON-GI-PEN-NA'T^E (Lat. longus, long ; penna, wing). A group of the Nata- 

 torial Birds. 



LON-GI-ROS'TRES (Lat. longus / rostrum, beak). A group of the Wading Birds. 



order of Crustacea. 

 LO-RI'CA (Lat. for a breast-plate). Applied to the protective case with which 



certain Infusoria are provided.. 

 LOR-I-CA'TA (Lat. lorica } a cuirass). The division of Reptiles comprising the 



Chelonia and Crocod^Ua, in which bony plates are developed in the skin 



(derma). 



LU-CER-NAR'I-DA (Lat. lucerna, a lamp). An order of the Hydrozoa. 

 LUM'BAR (Lat. himbus, loin). Connected with the loins. 

 LU'NATE (Lat. luna, moon). Crescentic in shape. 



