20 DIVISION OF FISH AND GAME 



2a. Ventral fins with more or less than 5 rays. 



3a. Ventral fins with more than 5 rays and a more or less evident spine. 

 4a. Barbel on the lower jaw ; 3 separate dorsal fins and 2 separate anal fins. 



Tomcod, Microgadus proximus (page 47). 

 4b. No barbel ; 2 dorsal fins, the second deeply notched ; a single deeply 

 notched anal fin. 



Hake, Merluccius productus (page 46) . 

 3b. Ventral fin with less than 5 rays ; spine present or absent. 

 5a. Upper jaw prolonged into a sword. 



Striped marlin, Makaira mitsukurii (page 64). 

 nb. Upper jaw not prolonged into a sword. 



6a. A narrow bone extends just under the skin from below the eye back 

 across the cheek. Large, antler-like spine on preopercle. 



Staghorn sculpin, Leptocottus armatus (page 115). 

 6b. There is no such bone. 



7a. Body with many luminous organs. 



Midshipman, genus Porichthys (page 117). 

 7b. Body without luminous organs, scaled ; tail forked. 



Kelpfish, Heterostichits rostratus (page IIS). 

 2b. Ventral fins definitely with 1 spine and 5 rays. 



Sa. A narrow bone extends just under the skin from below the eye back acro.ss 

 the cheek. 

 9a. Anal fin with 11 or less rays ; no slit after the fourth gill. 

 10a. Dorsal spines 15 or more. 



Channel rockfish, Selastolohus alascanus (page 109). 

 10b. Less than 15 dorsal spines. 



11a. Dorsal spines 12. Sculpin, Scorpaena guttata (page 110). 



lib. Dorsal spines 13 (rarely 14). Rockfish, genus Sehastodes (page 94). 

 9b. Anal fin with 12 or more rays ; definite slit behind the fourth gill. 

 12a. Body scaleless, the skin smooth ; 11 dorsal spines. 



Cahezone, Scorpaenichthys marmoratus (page 114). 

 12b. Body uniformly scaled. 



13a. Well-separated dorsal fins ; 2 nostrils on each side of snout. 



Sablefi-sh, Anoplopoma fimbria (page 111). 

 13b. Dorsal fin continuous, notched ; 1 nostril on each side of snout, 

 a pore above it. 

 14a. One lateral line ; the jaws with strong canine teeth. 



Lingcod, Ophiodon elongatus (page 113). 

 14b. Several lateral fines ; jaws without canine teeth. 



Greenling seatrout, Hexagrammos decagram mns (page 112). 

 8b. There is no such bone. 



15a. Soft dorsal and anal fins followed by 4 or more fiulets. 



16a. Spiny and soft dorsals widely separated ; about 30 distinct wavy vertical 

 bars on the sides. 



Pacific mackerel, Pneumatophoriis diego (page 58). 

 16b. Spiny and soft dorsals joined or almost joined. 



17a. Lower part of the sides with 4 or 5 dark horizontal stripes. 



Skipjack, Katsuivonus pelamis (page 63). 

 17b. No stripes on the lower part of the sides. 



18a. Upper part of the sides with several dark stripes. 



19a. Stripes oblique ; 15 or more gill rakers on the lower limb of the 



first arch. California bonito, Sarda lineoluta (page 62). 



19b. Stripes horizontal ; 10 or less gill rakers on the lower limb of the 



first arch. Mexican bonito, Sarda veioa; (not illustrated). 



18b. No such stripes present. 



20a. Spiny dorsal much longer than head ; sides with bronze spots. 

 Sierra, Scomberomoriis sierra (not illustrated). 

 20b. Spiny dorsal shorter than head ; no such spots on sides. 

 21a. Pectoral long, extending beyond the anal insertion. 

 22a. Vent round ; ventral surface of liver striated. 



Albacore, Thunnus germo (page 59). 

 22b. Vent oval ; faint marginal striations on ventral surface 

 of liver. 



Big-eye tuna, Parathunnus mebachi (not illustrated). 



