SCIENTIFIC SURVEY. 43 



Isthmus — A narrow connecting space. 



Intermaxillary — Applied to bones situate between the upper jaws 

 or cheek bones. 



J. 



Jugular — Pertaining or relating to the throat or neck. 



L. 



Lateral line — A line extending from the head of a fish to the tail 

 on each side of the body. It contains numerous pores or ducts 

 from which proceeds the mucus or slimy matter covering the 

 body offish. 



LoPHOBRANcmi — Tufted gills or crested gills ; from lophoura a crest, 

 and branchii gills. The sixth order in some systems. 



M. 



Malacopterygii — Soft fins. Fish, the rays of whose fins are soft 

 and not spinous, belong to the Malacopterygii or Malacopteri ; 

 the fourth order of fishes ; from malakos soft, and peterygii little 

 wing. 



Malacopteri — Same as above. 



Milt — The roe of fishes. The spermatic part of the male fish cor- 

 responding to the roe in the female. 



Monophyllous — Literally having one leaf. In Ichthyology, when 

 the gill lid is composed of but one piece, it is said to be mono- 

 phyllous. 



0. 



Opercle — The gill flap, {see gills.) 



Opercular — Belonging to the opercle. 



Operculum — The opercle ; which see. 



Osseous fishes — Fishes whose spinal column and skeleton are made' 



of bones. 

 Ovoviparous — Fishes whose eggs are hatched in the uterus and are 



excluded with the fry or young fish. 



P. 



Palatines — The bones belonging to and forming the back part of 

 the roof of the mouth. 



