206 University of Washington Publications in Biology [Vol. 2. 



Lateral Teeth. See teeth lateral. 



Laterally. Sidewise. 



Length of upper jaw. Often referred to as "maxillary" in descrip- 

 tions, measured from tip of the upper jaw (premaxillary sym- 

 physis) to the posterior end of the maxillary. 



Length of body (standard length). Usually this length is measured 

 from the tip of the snout to the base of the caudal rays (end 

 of the last vertebra or hypural plate). 



Lingual. Pertaining to the tongue. 



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

 fork. 



Mandible. Lower jaw. 



Marbled. Variegated ; clouded. 



Maxilla or maxillary. Upper jaw. See length of upper jaw and see 



maxillaries. 

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



fishes they are joined to the premaxillaries in front or below, 



and usually extend farther back than the latter. They often 



lie above the premaxillaries. 

 Mesocoracoid. Median bone in the form of an arch in front of the 



coracoids, found only in certain soft rayed fishes. 

 Mesethmoid. See ethmoid. 

 Mesopterygoid. A bone of the suspensorium. 

 Metapterygoid. A bone of the suspensorium, supporting the lower 



jaw. 

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



teeth. 

 Mottled. Color spots running together, blotched. 

 Mouth inferior. The mouth is located ventrally and a little behind 



the tip of the projecting snout. 

 Mouth oblique. The mouth is a modified terminal one in which the 



jaws usually lie at an angle of about 40 degrees or more to the 



anterior-posterior axis of the body. 

 Mouth ventral. The mouth is located much behind and below the 



tip of the snout, usually a distance equal to or more than 



length of snout. 

 Muciferous. Producing or containing mucus. 

 My comma (pi. Mycommata). A septum between two myotomes. 

 Myodome. Cavity under the brain cavity for reception of the rectus 



muscles of the eye. 

 Myotomes. Muscle segments. 

 Myxopterygia. See claspers. 



