94 MEMOIRS OF TEE QUEENSLAND MUSEUM. 



14. Galeocerdo : — 



a^. Monotypic ; inhabiting all tropical and temperate seas . . .. .. .. 19. arcticus. 



15. Physodon : — 



a^. Snout long ; labial folds short ; anal more than thrice as long as second dorsal 20. mulleri. 



a^. Snout short ; labial folds well developed ; anal less than twice as long as second dorsal 



21. taylori. 



16. SCOLIODON : — 



a^. Labial grooves very short. 



h^. Snout short, preoral length two fifths of head ; anal wholly in advance of second dorsal 



22. jordani. 



b^. Snout long, preoral length more than half of head ; anal partly in advance of second dorsal. 



c^. First dorsal higher than long ; eye midway between tip of snout and fourth gill-opening 



23. affinis. 

 C-. First dorsal longer than high ; eye midway between tip of snout and first gill-opening 



24. acutus. 

 a-. Labial folds well developed, outer about one third ramal length. 



d^. Second dorsal five ninths of base of anal . . . . . . . . . . 25. longmani. 



17. Aprionodon : — 

 a^. Snout short and broad. 



b^. Second dorsal rather larger than and originating somewhat in advance of anal 26. acutidens. 



18. Rhizoprion : — 



A single species from the coasts of South and Middle Queensland ; v. supra, p. 80. 



19. Carcharhinus : — 



o^. Tail shorter than head and trunk ; snout broadly rounded . . . . . . 28, stevensi. 



a^. Tail as long as head and trunk. 



6^. Pectoral extending to below anterior third of first dorsal ; snout three fourths of width of 



mouth . . . . . . . . . . . . . . . . 29. amblyrhynchus. 



b^. Pectoral extending to below end of first dorsal. 



c^. Snout two thirds of width of mouth . . . . . . . . . . 30. spenceri. 



c^. Snout as long as width of mouth .. .. .. .. .. ..31. melanopterus. 



20. Cestracion : — 



n'. Nostril remote from eye .. .. .. .. .. .. .. .. 32. blochii. 



a^. Nostril adjacent to eye. 



b^. Rostral dilation at nostril longer than wide ; narial groove less than one third width of 

 head . . . . . . . . . . . . . . . . . . 33. lewini. 



6*. Rostral dilation at nostril wider than long ; narial groove more than one third width of 

 head . . . . . . . . . . . . . . . . . . 34. tudes. 



21. Heterodontus : — 



a*. Base of anal rather less than half of ano-caudal interspace . . . . . . 35. phillipi. 



22. Gyropleurodus : — 



a^. Base of anal longer than ano-caudal interspace ; first dorsal originating above end of pectoral 

 base . . . . . . . . . . . . . . . . . . 36. galeatus. 



23. Hypnos : — 



Monotypic ; the single species inhabiting temperate Australia, 



