86 THE PLAGIOSTOMIA. 



reaching the mouth, not as wide as the space between them, slightly lobed at 

 their outer angle ; posterior valves short, broad, not confluent with the anterior 

 at their inner edges. Mouth wide, somewhat angular in outline, arched around 

 the symphysis, with a short labial fold around the angles on each jaw. Teeth 

 small, striate based, smaller in three to five or more of the symphyseal rows, 

 three to five cusped, median cusp largest. Eye medium, as long as the mouth. 

 Spiracle small, near the corner of the eye. Gill openings moderate, hindmost 

 two above the pectorals. Dorsals subequal, smaller than the anal; origin of 

 the first dorsal above the hinder ends of the bases of the ventrals; origin of the 

 second at the front end of the hindmost fifth of the anal base, base of the dorsal 

 extending two thirds of its length behind that of the anal. Bases of the ventrals 

 one and one half times that of the dorsal, hind margins of the fins oblique. 

 Base of the anal nearly twice that of the dorsal, about two thirds of its distance 

 from the caudal. Subcaudal narrow, width about one fourth of the length. 

 Scales small, tricuspid, median cusp strong. 



Olivaceous to greyish brown, with scattered small spots of darker, with 

 eight or more blotches across the back; lower surfaces lighter, mottled. Here 

 described from a female of 21 inches from Port Jackson. 



New South Wales. 



Halaelurus bivius. 



Scyllium bivium A. Smith, 1837, Proc. Zool. soc. Lond., p. 85 (name only); Muller & Henle, 1841, 



Plagios, p. 8; Dumeril, 1865, Elasm., p. 321; Gunth., 1870, Cat. fishes Brit, mus., 8, p. 405. 

 Scyllium brei'icolle Philippi, 1887, Ann. Univ. Chtfe, 71, p. 561, pi. 7, f . 5. 

 Scyllium gayi Philippi, 1887, Zool. garten, p. 86. 



Scyllium chilense, Vaillant, 1891, Cap Horn. Poissons, p. 10, pi. 1, f. 1. 

 Scylliorlu nits chilensis Smitt, 1898, Bih. kon. Svenske vet.-akad. HanUl., 24, p. 72. 

 Scylliorhinus brevicollis Delfin, 1901, Cat. peces Chile, p. 15. 

 Scyliorhinus bivius Regan, 190S, Ann. & mag. nat. hist., ser. 8, 1, p. 462. 



Body shorter than the tail. Head short, broad, depressed. Snout short, 

 narrowed forward, blunt. Nostrils with two valves; anterior valve not reaching 

 the mouth, widely separated on the internarial space, without cirri; posterior 

 valves short. Mouth large, with labial folds, around the angles, on each jaw 

 about half its length. Eye moderate. Spiracles small, close to the angle of 

 the eye. Gill openings moderate, hindmost two above the pectoral. First 

 dorsal little smaller than the second, base two thirds to one half the length of 

 that of the anal, about one third of the distance from the second dorsal, extend- 

 ing forward above the posterior third of the bases of the ventrals. Base of the 

 second dorsal longer than that of the first, extending forward above the posterior 

 third of the anal. Anal small, base little longer than that of the second dorsal, 



