CHECK-LIST OF CEPHALOCUOBDATES, cJc.—OGILBY. 93 



KEYS TO THE SPECIES OF QUEENSLAND SELACHIANS. 



1. Carchakias : — 



a^. Head nol depressed ; 4th and 5th teeth on each side of upper jaw niiich smaller than the adjacent 

 teeth; eye-diameter one fifth of preoral length .. .. .. 1. arenarius. 



2. Alopias : — 



A single species, inliabitating the wanner parts of the Atlantic and Pacific Oceans; v, supra, p. 74. 



3. IsuRUS : — 



a^. First dorsal originating close behind vertical from hinder angle of pectoral ; second dorsal 

 partly before anal . . . . . . . . . . . . . . 3. glaucus. 



4. Carcharodon : — 



Monotypic ; the single species inhabitating all warm seas ; v. supra, p. 74. 



5. Nebrius : — 



Monotypic ; an inhabitant of the warmer latitudes of the Indian & Westei-n Pacific Oceans ; 

 V. supra, p. 75. 



6. Orectolobus : — 

 a^. Nasal cirrus lobate, 



b^. Sides of head with a nearly continuous series of branched lobes. 



c*. Origin of first dorsal well postmedian . . . . . . . . . . 6. ogilbyi. 



b-. Sides of head with only a few widely spaced lobes. 

 d^. Lobe of nasal cirrus bifid or trifid, rarely simple. 



c^. Body with large light ocelli . . . . . . . . . , . . 7. maculatus. 



e^. Body marbled, with distinct cross-bands . . . . . . . . . . 8. ornatus. 



a". Nasal cirrus simple; dermal lobes three on each side, widely separated and entire 9. tentaculatus . 



7. Brach^lurus : — 



One species onlj% from Eastern Australia ; v. supra, p. 76. 



8. Heteroscyllium : — 



One species only, from South Queensland ; v. supra, p. 76. 



9. Chiloscylt.itjm : — • 



a^. Fold of lower lip interrupted ; a large ocellus above the pectoral fin. 



b^. Body with large scattered dai'k spots . . . , . . . . . . 12. ocellatum. 



b-. Body with numerous small close-set dark spots .. .. .. ..13. trispeculare. 



a^. Fold of low^er lip continuous ; no ocellus above the pectoral fin. 



c^. Origin of first dorsal above anterior section of ventral-base . . . . 14. punctatum. 



10. Stegostoma : — 



Monotypic ; inhabitating the warmer parts of the Indian and Western Pacific Oceans. 



11. Hal/Elurus : — 



o^. Base of anal less than ano-caudal interspace. 



b^. Anterior nasal valve not overlapping mouth ; lower labial fold nearly reaching symphysis 



16. labiosus. 



12. MUSTEL-CS : — 



a^. Dorsal originating above inner angle of pectoral. 



b^. Teeth each with an obscure transverse ridge ; upper labial fold the longer 17. antarcticus. 



13. Galeus : — 



a^. Second dorsal and anal fins subequal ; snout sonaewhat produced, as long as width of mouth. 

 b^. First dorsal equidistant from pectoral and ventral ; ventral originating well behind middle 

 of length . . . . . . . . . . . . . . . . 18. austraJis. 



