1936] SchuUz: Keys to Fishes 121 



48b. Body uniformly and evenly covered with scales in local species. 



49a. Slit behind 4th gill a mere pore or wanting; anal spines 

 III, dorsal spines XII to XVII ; preopercle with 5 or 6 

 strong spines. Fig. 10. 

 Rockfish. Rock Cod 63. Scorpaenidae, p. 163 



49b. Slit behind the 4th gill larger than a pore, an obvious slit; 

 preopercle without 5 or 6 strong spines. 



50a. Nostril single on each side and the second if present re- 

 duced to a mere pore ; dorsal fins contiguous or con- 

 nected often with a deep notch between the spines and 

 soft rayed portion. 



51a. Mouth smaller, the maxillary not reaching or barely 

 reaching to orbit; jaws without strong canine teeth. 

 Greenlings 66. Hexagrammidae, p. 171 



51b. Mouth large, the maxillary reaching beyond orbit; 

 jaws with strong canine teeth. 

 Ling Cod 67. Ophiodontidae, p. 172 



50b. Nostrils 2 on each side and of nearly equal development. 



52a. Dorsal fins widely separated ; dorsal rays XX to 

 XXII, 16 to 18; anal 15 to 17. 

 Skilfish. Black Cod.. 64. Anoplopomidae, p. 170 



52b. Dorsal fin deeply notched; dorsal XIV-I, 15; anal 

 ii+11. 

 Priest Fish 65. Erilepidae, p. 170 



45b. No bony suborbital stay or plates on side of head as in 45a. 



53a. Pelvic fins completely united with each other ; fig. 16, the 

 rays being normal and not modified into round pads as in the 

 Liparididae ; fig. 17. 

 Gobies 74. Gobiidae, p. 191 



53b. Pelvic fins separate, not united. 



54a. Body covered with scales. 



55a. (See 55b, p. 123.) Pelvic fins definitely I, 5, the spine some- 

 times grown fast to the first soft ray ; pectoral fin entire. 



56a. Dorsal and anal each followed by finlets. Fig. 11. 



57a. There is no middle keel on each side of caudal peduncle, 

 only the small pair of keels dorsally and ventraliy ; 1st 

 dorsal separated from 2nd dorsal by an interspace as 

 long as or longer than snout ; color on back of almost 

 vertical stripes. 

 Mackerels 51. Scombridae, p. 160 



57b. There is a middle keel on each side of caudal peduncle, 

 and a small keel above and below the large one. 

 Tunny and Albacore 52. Thunnidae, p. 160 



