324 BULLETIN 10 0, UNITED STATES NATIONAL MUSEUM 



Queensland, New South Wales, South Australia, New Zealand. 

 The large vertebral and shoulder tubercles, besides the blackish 

 lower surface of the snout are very characteristic. One seen in the 

 Queensland Museum from Southport. 



U.S.N.M. No. 40033, Port Jackson. Australian Museum. Length, 247 mm. 

 U.S.N.M. No. 29015. No locality. Australian Museum. Head and body partly 



skinned out 980 mm. long. Under surface of snout with suffused dusky 



to blackish. 



APTYCHOTREMA BGUGAINVILLII (Muller and Henle) 



Rhvnobatus (Syrrhina) bougainvillii (Valenciennes) Mtjlleb and Henle, Syst. 

 Beschr. Plagiostomen, p. 117, 1841 (locality unknown). — Gray, List fish 

 British Museum, p. 95, 1851 (reference). — Dum^kil, Hist. Nat. Elasmobr., 

 vol. 1, p. 491, pi. 10, fig. 1 (snout), 1865 (type). 



RhinoMtus Vougainvillii Gxjntheb, Cat. Fishes British Mus., vol. 8, p. 445, 1870 

 (compiled). — Ogilby, Proc. Linn. Soc. New South Wales, vol. 10, p. 464, 

 1885 (New South Wales; Cape York) ; Cat. Fishes Australian Mus., pt. 1, 

 p. 15, 1888 (Port Jackson, Parramatta River). — Waite, Mem. Australian 

 Mus., vol. 4, p. 38, pi. 3, 1899 (off Cape Hawk to Shoalhaven Bight, in 

 10 to 48 fathoms).— Gabman, Mem. Mus. Comp. Zool., vol. 36, p. 277, 1913 

 (Port Jackson). 



Rhinobatos ioiigainvillii Fowleb, Proc. 4th (1929) Pacific Sci. Congr., Java, 

 p. 498, 1930 (reference). 



Aptychotrema bougainvilUi Noeman, Proc. Zool. Soc. Loudon, 1926, p. 978, text 

 fig. 29 (rostra) (Port Jackson). 



Depth 13 to 16 to subcaudal origin ; head 3% to 5% ; disk width 

 1^ to 114 its length. Snout 1^/^ to 1% in head, long, tapers to point ; 

 eye 7 to 10^4:? W5 to 7 in snout, 2% to 2% in interorbital ; dentary 

 width 3 to 3% in head with 2 very short labial folds at each mouth 

 angle ; teeth in 50 rows in jaws, nearly smooth or with very low cusp to 

 each tooth, rhomboid ; nostrils moderate, y^ of dentary width or 1% 

 in internarial width; nasal valves moderate, anterior rather slender 

 curved flap; posterior valve of similar size, extends little beyond 

 middle of nostril, flaps rather small with inner little broader or 

 larger than outer; interorbital 2% to 3% in head, depressed or level 

 medially, elevated supraorbital ridges. Gill openings equidistant, 

 nearly subequal. Spiracle deep, close behind eye, hind edge with 

 low fold. 



Scales very fine, smooth to touch. Spines all short and only one 

 to several inconspicuous before eye or above spiracles and about 28 

 inconspicuous larger in vertebral row to first dorsal, few more in- 

 conspicuous in interdorsal vertebral row besides 2 widely separated 

 low short spines at each shoulder. 



First dorsal with front edge 2% to 3 in head, rather broad ; second 

 dorsal similar, front edge 24^ to 3; caudal 1% to 2i^, subcaudal 

 without lobe, moderately low; pectoral moderately wide; ventral 



