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



4a. No photophores on cheeks or on shoulder ; only 2 to 4 precaudal or- 

 gans, often confluent with the anal organs (always count the last 

 4 organs in these series as precaudals) ; pectorals very small or ves- 

 tigial, not reaching beyond the base of the pelvics, sometimes absent ; 

 33 or more scales in lateral line ; dorsal 12 to 19 ; anal 14 to 25. 



5a. Usually 5 ventral organs ; only 2nd ventral organ elevated ; head 

 3 to 3 l / 2 in standard length ; supra-anal organs in a straight, oblique 

 series. Range : North Pacific Ocean in deep water. Marine. Rare. 

 109. Lampanyctus nannochir (Gilbert) 



5b. Usually 4 ventral organs ; supra-anal organs in a straight, oblique 

 series ; head 3.6 to 3.8 in standard length ; eye 3.5 in head. Range : 

 Alaska to San Diego. Marine. Rare. 

 110. Lampanyctus leucopsarus (Eigenmann and Eigenmann) 



4b. No photophores on shoulder, one or many minute ones on each cheek ; 

 supra-ventral organ twice as far from the base of the pelvic fin as 

 from the lateral line ; eye about 5j4 in head ; about 37 or 38 scales 

 in lateral line ; numerous minute photophores on each cheek and a 

 somewhat larger organ in the lower posterior corner ; anal organs 

 8+7 to 8; 4 precaudal organs. Range: Coast of Washington. Ma- 

 rine. Rare. 

 111. Lampanyctus regalis (Gilbert) 



2c. (See 2a, and 2b.) Precaudal organs 4, usually or always distinctly sep- 

 arate from the posteroanals ; no supra.- and infra.- caudal luminous scales, 

 except in a few species ; luminous scales are also probably always present 

 at the suprapectoral organ, but never along the bases of dorsal and anal 

 fins ; the 2 subpectoral organs always form an approximately straight series 

 with the 1st thoracic organ; antorbital organs often greatly enlarged, 

 each of the photophores on the body is divided by a black septum into 

 an upper and a lower part, but this feature may be difficult to make out 

 in poorly preserved specimens. Range : Alaska to San Diego in the Pa- 

 cific. Marine. Not rare. 

 112. Diaphus rafinesquei (Cocco) 



Family 34. Alepisauridae. Handsawfishes. Lancet Fishes 



Range : North Atlantic and North Pacific oceans. Marine. Not rare. 



Lancet Fish 113. Alcpisaurus jerox Lowe 



Family 35. Esocidae. Pickerels 



Range : Mississippi River and tributaries of Great Lakes. Probably intro- 

 duced into Washington. Freshwater. Locally abundant in eastern 

 Washington. 

 Little Pickerel 114. Esox vermiculatus LeSueur 



Family 36. Novumbridae. Western Mud-minnow 



Range : Chehalis River at Satsop, Washington. Freshwater. Rare. 



Western Mud-minnow. Fig 38 115. Novumbra hubbsi Schultz 



