78 THE PLAGIOSTOMIA. 



than to the end of the snout; anterior valves not reaching the mouth, broad, 

 widely separated on the internarial space; posterior valves shorter. Mouth 

 large, its width more than twice its length; a short labial fold on the lower jaw. 

 Dorsals small; first nearly equal the anal, origin above the ends of the bases 

 of the ventrals ; second dorsal much smaller, origin behind the middle of the base 

 of the anal. Subcaudal short, base nearly twice as long as the base of the 

 anal. Scales rough, with one to three sharp cusps, a median keel and diverging 

 striae. A small species the males of which mature at about twenty inches in 

 length. 



Brown or greyish brown with nine or ten large irregular subquadrate blotches 

 of darker across the back and the sides, and (on young) with scattered spots of 

 whitish over ground color and blotches. Lower surfaces light, plain. 



Misaki, Japan. 



Catulus cephalus. 



Catulus cephalus Gilbert, 1891, Proc. U. S. nat. inns., 14, p. 541; Johd. & Everm., 1896, Bull. 47, U. S. 



nat. mus., p. 24. 

 Scyliorhinus cephalus Regan, 1908, Ann. & m:ig. nat. hist., ser. 8, 1, p. 460. 



A small species from deep waters, taken off the Revillagigedo Islands in 

 460 fathoms, and in the Gulf of California at 362 fathoms. The description does 

 not include the nasal valves, the labial folds, the eyes, etc., consequently the 

 position of the species is not at all certain. It is placed here provisionally. 



Head wider and snout shorter than in Parmaturus xaniurus. Length of 

 snout less than half its greatest width. The dorsals are the larger, the anal is 

 the smaller, nearly equal the second dorsal and ending slightly in front of it. 

 The first dorsal terminates above the ventrals instead of behind them. The 

 position of the second dorsal is said to agree with that of Halaelurus canescens, 

 that is its origin is nearly above the middle of the base of the anal. Males of 

 about ten inches in length were nearly mature. 



Uniform brown, above and below. 



( 'ephaloscyllium. 



Scyliorhinus Blaix., 1816, Bull. Soc. philom., p. 121 (part). 

 Cephaloscyllium Gill, 1861, Ann. X. Y. lye, 7, p. 412. 



Body robust, longer than the tail. Head broad, depressed. Snout short, 

 blunt, narrowing rapidly forward. Nostrils distant from one another, near the 

 lip. nearer to the end of the snout than to the angles of the mouth; no nasoral 

 groove; valves not extended on the internarial space, without cirri, posterior 



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