368 GLOSSAUY OF TECHNICAL TERMS. 



Luna. An immature form, wliich must undergo cliange of appear- 

 ance before becoming adult. 



Lateral. To or towards tlie side. 



Lateral line. A series of muciferous tubes forming a raised line along 

 tlie sides of a fish. 



Laterally. Sidewise. 



Lobate. Furnislied with membranous flaps, — said of tiie toes of birds. 



Longitudinal. Running lengtliwise. 



Loral })l(tte. Plate between eye and nostril of a serpent, before and 

 below preocular when this is present ; its longest diameter hori- 

 zontal. 



Lores. Space between eye and bill. 



Lunate. Form of the new moon ; having a broad and rather shallow 

 fork. 



Mammary glands. Glands secreting milk. 



Mandible. Under jaw (or in birds, either jaw). 



Masilla. Upper jaw. 



Maxillaries. Outermost or hindmost bones of the upper jaw, in fishes; 

 they arc joined to the prenia.\illaries in front, and usually e-xtend 

 fartiier back than the latter. 



Metacarpus. The hand j)roper, exclusive of the fingers. 



Metamorphosis. A decideil change in form. 



Metatarsus. The foot proper. 



Molars. The grinding teeth ; posterior teeth in the jaw. 



Monogamous. Pairing ; said of birds. 



Muciferous. Producing or containing mucus. 



Myocomma. A muscular band. 



Nape. Upper part of neck, next to the occiput. 



Nures. Nostrils, anterior and ])08terior. 



Nasal. Pertaining to the nostrils. 



Nasal plate. Plate in which the nostrils are inserted. 



Neural spine. The uppermost spine of a vertebra. 



Nictitating membrane. Tiie third or inner eye-lid, of birds, sharks, 

 etc. 



Notochord. A cellular cord, which in the embryo precedes the verte- 

 bral column. 



Nuchal. Pertaining to the nape or nucha. 



Obscure. Scarcely visible. 



Obsolete. Faintly marked ; scarcely evident 



Obtuse. Blunt. 



Occipital. Pertaining to the occiput. 



Occipital plates. Plates on the head of a serpent, behind the vertical 

 plate. 



Occi/nU. Back of the head. 



Ocellnle. With eye-like spots, generally roundish and with a lighter 

 border. 



Oid (suffix). Like, — as Perroid, perch-like. 



Operclc, or operculum. Gill cover ; the posterior membrane bone of the 

 side of the liead, in fisiies. 



