SQUALUS. 191 



little more than twice as long as deep, vertebral axis rising backward, terminal 

 portion of fin separated from the subcaudal by a shallow indentation, subcaudal 

 lobe not produced. Scales rough, tricarinate, median keel produced and sharp, 

 lateral keels short. 



Back brown, edges of fins lighter; lower surfaces light. 



Description from an eighteen inch specimen taken in the Mediterranean. 



OXYNOTUS BRUNIENSIS. 



Centrina bruniensis Ogilby, 1893, Rec. Australian mus., 2, p. 62. 

 Oxynotus bruniensis Waite, 1907, Rec. Cantcrb. mus., 1, p. 8. 



Back and sides rounded, belly flattened. Head small, strongly depressed; 

 snout short, obtuse, nostrils halfway from the eye to the end. Eye large, midway 

 from the first gill opening to the end of the snout. Spiracles large. Mouth 

 small, transverse, lateral grooves broad and deep. Upper jaws with a patch of 

 small, conical, curved teeth of about four irregular series; lower teeth in a single 

 series of larger, erect, compressed, minutely serrated, scalpriform teeth. Gill 

 openings small, in front of the pectoral. Origin of first dorsal above the third 

 gill opening, height of fin equal to the distance between the end of the snout and 

 the first gill opening; spine equal to length of head in front of the spiracle, rising 

 straight with a slight forward inclination, its base in the anterior portion of the 

 last fourth of the base of the fin, midway from the end of the snout to the 

 caudal fin. The distance between the bases of the dorsals is little more than the 

 length of the base of the first dorsal in front of the spine. Second dorsal smaller 

 than the first, basal length equal to interdorsal space and to height of fin. Pec- 

 torals pointed, length of front margin equal to the distance from the nostril. 

 Origins of the ventrals below the spine of the second dorsal, the distance from 

 their ends to the caudal equal to that between the second dorsal and the caudal. 

 Caudal well developed. Scales rough, with a central spine from which radiate 

 fom* compressed wings, each terminating in a shorter spine. 



Uniform sandy brown. 



Distinguished from 0. centrina by the great height of the dorsal fins, their 

 distance from one another, and by the scales. 



Type from Bruny Island, Tasmania. 



Squalus. 



Squalus Linn:e, 1735, Syst. nat. (part); Artedi, 1738, Ichthyologia (part); Linn6, 1758, Syst., 1, p. 233 



(part). 

 Dalatias Rafinesque, 1810, Caratteri, p. 10 (part). 



