48 THE PLAGTOSTOMIA. 



Fins of moderate size, angles not produced. Dorsals subequal; origin of 

 first above the middle of the bases of the ventrals, base extended little beyond 

 the ends of these fins and ending about mid total length ; base of second distant 

 from that of first little more than half its length. Anal small, near the caudal, 

 origin below the end of the base of the second dorsal. Caudal short, lower 

 subcaudal margin a broad convex, not lobed. Claspers ending in a slender, 

 sharp, flexible point. 



Brownish to greyish brown, back darker, belly yellowish; young with about 

 ten transverse bands of darker on back and sides, separated by narrower spaces, 

 with irregular scattered small spots of whitish on body and fins. Adults more 

 nearly uniform brownish. 



New South Wales. 



Brachaelurus (Heteroscyllium) colcloughi. 



Brachaelurus colcloughi Ogilbt, 1908, Proc. Roy. Soc. Queensland, 21, p. 3. 

 Heteroscyllium colcloughi Regan, 1908, Ann. mag. nat. hist., ser. 8, 2, p. 455. 



Body robust. Preoral length one third of that of the head. Anterior 

 angle of the nostril equidistant from the mouth and the tip of the snout; inter- 

 narial width about equal the preoral length, eight ninths of the width of the 

 mouth; nasal cirrus five sevenths of the preoral length, not extending to the 

 lower labial groove, one and one half times the diameter of the eye. Mouth 

 much nearer to the eye than to the tip of the snout, width seven sixteenths of 

 the length of the head. Eye somewhat nearer to the tip of the snout than to the 

 first gill opening, length of orbit six and two fifths times in the length of the head. 

 Spiracle smaller than the eye. Length of body to vent four fifths of the caudal 

 length. Origin of the first dorsal above the middle of the bases of the ventrals, 

 hind angle pointed. Second dorsal similar in shape to the first, somewhat 

 smaller. Distance between the origin of the anal and the second dorsal less than 

 the interdorsal space; free space between the anal and the caudal less than 

 twice the length of the anal base. Distance of the pectoral from the ventrals 

 two thirds of that from the tip of the snout; pectoral base rather more than half 

 the greatest width of the fin, and rather less than half the length, which is six 

 sevenths of that of the head. Origins of the ventrals a little nearer to the first 

 dorsal than to the pectorals. 



Back, flanks and tail ashy grey; lower surfaces white. 



Type about 18.1 inches (460 mm.). 



Coasts of Queensland; Moreton Bay. 



