XIV. KEY TO THE FAMILIES. 



* * Ventrals Jugular. 

 t Spinous dorsal greater than the soft. 



BlenniidcB. Spinous part of anal less than the soft ... p. 31 



Acanthod'mldcB. Spinous part of anal greater than the soft ... p. 34 

 + + Spmous dorsal less than the soft. 



1. Two dorsal tins. 



Pediculati. Body covered with minute spines ... ... p. 30 



TrachtnldcB [lixvt). Body smooth, or scaly ... ... p. 22 



2. One dorsal fin. 



TracldnklcB {^axi). Mouth vertical, or oblique ... ... p. 22 



Trkhonotklce. Body eel-like, upper jaw longer ... ... p. 37 



*** Ventrals Abdominal. 



1. Two dorsal fius. 



MugUidcB. Dentition feeble ... ... ... p. 35 



2. One dorsal fin. 



Centrlschlce. Mouth produced into a tube, body elevated ... p. 38 

 FistularklcB. Mouth produced into a tube ; body elongated ... p. 38 

 Notacantlii. Dorsal a few small free spines ... ... p. 39 



b. An adhesive disc between the ventrals. 

 Gohiesocidce. No spmous portion to dorsal ... ... p. 40 



B. Gills comb-like ; anal and ventral without spinous rays ; body scaly or smooth. 



* Body Symmetrical, with an Eye on e.vch side of the Head. 

 + Ventrals jugular. 



Gadidx. Two or three dorsal fins ... ... ... p. 44 



OphldUdcB. One dorsal, united to caiidal ... ... p. 47 



ti" Ventrals thoracic. 



MncrurldcB. Tail tapering to a fine point ... ... p. 48 



•W\ Ventrals abdominal or absent. 



1. Second dorsal adix^ose. 



Sternoptychklaa. Marine ; mouth very large ... ... p. 55 



HaplochitonklTR. Fresh water ; first dorsal before the vent ... p. 57 



Salmonklve. Fresh water ; first dorsal over the vent ... p. 57 



2. No adipose fin. 



Scomberesoculx. Scaly ; mouth terminal ; dorsal o^jposite to anal p. 52 



Clupeklas. Scaly ; mouth terminal ; dorsal in front of anal ... p. 02 



Gonorhynchklsc . Scaly ; mouth inferior ... ... ix 61 



Galaxklx. Naked ; dorsal short ... ... ... p. 58 



Mu7'senidiG. Naked; dorsal very long ; no ventrals ... p. 04 



* * Both Eyes on the same side of the Head. 



Pleuronectidsi. Body flat, only one side colored... ... p. 50 



C. Gills composed of rounded tufts, opening small ; body covered with bony rings, 



never scalJ^ 

 Syngnathldx. Tail long, tajiering ... ... ...13.67 



D. Gills comb-like, opening n!h-row ; body %\'ith spines or scutes, never scaly. 



SeUrodenm. Jaws with teeth ... ... ... p. 70 



Gymnodontes. Jaws formed into a beak ... ... p. 72 



