284 J. D. OGILBY AND A. B. McCULLOCH. 
HETEROSCYLLIUM COLCLOUGHI, Ogilby. 
Brachelurus colcloughi, Ogilby, Proc. Roy. Soc. Queensl., xxi, 
1907, p. 4. 
** Blue-gray Cat Shark.’’ 
Body robust, its depth 7°60 in the total length. Width 
of head subequal to its depth immediately in front of the 
gill-openings and 1°50 in its length, which is 1°50 in that of 
the trunk and 5°60 in the total length. Upper profile of 
head evenly rounded; precral length 3°00 in the length of 
the head. Anterior angle of nostril equidistant from the 
mouth and the tip of the snout; internasal space about 
equaling the preoral length and 1°15 in the width of the 
mouth; nasal cirrus 1°40 in the preoral length, not extend- 
ing to the lower labial groove, and 1°50 times the diameter 
of the eye. Mouth much nearer to the eye than to the tip 
of the snout, its width 2°70, that between the outer angles 
of the labial grooves 2°30 in the length of the head. Kye 
somewhat nearer to the tip of the snout than to the first 
gill-slit, its longitudinal diameter 6°40 in the length of the 
head. Interorbital region mesially concave, its width 2°75 
in the head. Spiracle subvertical, situated ina deep ovate 
rimmed pit, its diameter 1°50 in that of the eye. Branchial 
region 2°40 times the diameter of the eye; width of first 
gill-slit 1°50 in the eye and 1°60 in the last slit. Length 
of head and trunk 1°25 in that of the tail. First dorsal fin 
originating above the middle of the base of the ventrals, 
its distance from the tip of the snout 2°25 in the total 
length; anterior and outer borders of fin sublinear, the 
intervening angle broadly rounded; posterior angle pointed, 
the hinder border proximally emarginate, its length 1°50 
times the diameter of the eye and rather more than 3°00 
in its basal length, which is one-half more than the vertical 
height of the fin: second dorsal similar to but not quite so 
large as the first, its distance from the origin of which is 
1°75 in that from the tip of the tail. Distance between 
