462 BULLETIN 10 0, UNITED STATES NATIONAL MUSEUM 



ll^ to 114 in tail. Snout I2/3 to Ifs in head; rostral fins forming 

 broadly convex lobe in front ; eye 3% to 5, 2% to 2% in snout, Z% 

 to 4 in interorbital ; dentary width 214 to 21/2 in head ; teeth with 

 broad median row 2 to 6 times wide as long, with 2 lateral rows 

 each side; upper lip with narrowly fringed edge, lower pleated; 

 nostrils simple, deep pits, internarial width II/5 in dentary width; 

 interorbital 1 to 1% in head, level, with wide median depression 

 due to broad fontanel. Gill openings equidistant, last shortest. 

 Spiracle deep lateral slit, twice eye, opens laterally. 



Skin smooth. Caudal spine 1^ in interorbital. 



Dorsal length 3l^ in head; no anal; tail long, slender, whiplike; 

 pectorals wide, triangular, front edge nearly straight, hind edge 

 slightly concave, ends in rather obtuse front point and acute hind 

 point; ventrals short, broad, hind edge broadly convex; claspers 

 short, flat, somewhat pointed. 



Rather dark brown above. Under surface whitish. Tail and 

 dorsal all dusky, at least terminally. 



Queensland, New South Wales, Victoria. According to McCulloch 

 attains a width of 1,220 mm. 



U.S.N.M. No. 59887. Port Jackson. D. G. Stead. Length, 445 mm. 

 U.S.N.M. No. 59888. Wouboyn? River, New South Wales. D. G. Stead. Length, 

 498 mm. 



HOLORHINUS TENUICAUDATUS (Hector) 



MyUoiatis tenuicaudatus Hectob, Trans. New Zealand Inst., vol. 9, p. 468, pi. 10, 

 1877 (type locality: Wellington Harbor, New Zealand). — Waite, Rec. Can- 

 terbury Mus., vol. 1, No. 1, p. 9, 1907 (reference) ; vol. 1, No. 2, p. 152, 1909 

 (off Poverty Bay and Bay of Plenty, in 16 to 57 fathoms). — Gabman, Mem. 

 Mus. Comp. ZooL, vol. 36, p. 433, 1913 (New Zealand; not Australia). — ■ 

 Waite, Rec. South Australian Mus., vol. 2, p. 34, fig. 48, 1921. — Fowlee, 

 Proc. 4th (1929) Pacific Sci. Congr., Java, p. 507, 1930 (reference; part). 



Myliobatis aquila (not Linnaeus) GtJNTHEE, Cat. Fishes British Mus., vol. 8, 

 p. 489, 1870 (part). 



Head to hind spiracle edge 6 in total length. Snout 1% in head 

 to hind spiracle edge, as seen from above front profile broadly con- 

 vex; eye 5, 3 in snout, 3i/^ in interorbital; teeth in pavementlike 

 plates, upper flat, lower curved, all yellow; both plates in 2 series, 

 median broad row and 2 laterals, latter of rows of subcircular plates, 

 3 in width and together about half width of median series, not ex- 

 tending to front of mouth; upper median plates 11, lower 7; nostrils 

 close together, separated by thick columnar f renum ; nasal fold long 

 and rectangular, hinder border concave and papillose, widest at free 

 edge where twice its length; interorbital 1% in head. Spiracle 

 twice eye diameter. 



Body smooth. 



Dorsal small, base Yq less than spiracle, on tail with middle over 

 hinder ventral edge; 2 serrated spines on tail behind fin; tail little 



