The Embryology of Heterodontus japonicus 659 



names are used for different genera of sharks. I have not found the name Centracion used 

 by any writers other than Gray and Garman. 



For the reasons stated, I prefer the generic name Heterodontus Blainville for those 

 species of Bullhead Sharks that are represented by specimens living at the present time. 

 Since many authors, mainly paleontologists, have used the name Cestracion for the same 

 genus, it is necessary to recognize this term in reviewing their publications. For con' 

 venient reference, I have compiled the following synonymy : 



HETERODOHTUS (Blainville) 



Port Jackson Shark (in genus Squalus). Phillip, 1789, Voyage to Botany Bay, pp. 283-284, pi. 

 Heterodontus. Blainville, 1816, Bull. Soc. Philom. Paris, 3. ser. 3, p. 121 (not Heterodon 



Latreille, 1802). 

 Les Cestracions. Cuvier, 1817, Regne Animal, II, p. 129 (not Cestracion Klein, 1742 and 



1776; nor Walbaum, 1792). 

 Centracion. Gray, 1831, Zool. Misc., I, p. 5. 

 Heterodontus, Tropidodus, and Gyropleurodus. Gill, 1863, Proc. Acad. Nat. Sci. Philadelphia, 



14, p. 489. 

 Heterodontus. Dumeril, 1865, Histoire Naturelle des Poissons, I, p. 424. 

 Heterodontus Bl. Maclay and Macleay, 1879, Plagiostomata of the Pacific. Proc. Linn. Soc. 



New South Wales, 3, p. 309. 

 Heterodontus Bl. Ogilby, 1890, Australian Palaeichthyes. Proc. Linn. Soc. New South Wales, 



2. ser. 4, p. 184. 

 Cestracion Cuvier. Woodward, 1889, Catalogue Fossil Fishes British Museum. Part I, 



p. 331. Woodward, 1891, Hybodont and Cestraciont Sharks of the Cretaceous Period. 



Proc. Yorkshire Geol. and Polytech. Soc, 12, part 1, p. 67. 

 Heterodontus Bl. Jordan and Fowler, 1903, Proc. U. S. Nat. Mus., 26, p. 599. 

 Centracion. Garman, 1913, Plagiostomia. Mem. Mus. Comp. Zool., 36, p. 180. 



Having adopted the name Heterodontus for the genus that includes the only living 

 representatives of the Bullhead Sharks, I think it appropriate that the family name for 

 these sharks should be Heterodontidae. This name or its equivalent in a different language 

 has already been used, in the sense indicated, by several authors: e.g., Striiver, 1864; 

 Dumeril, 1865, p. 623; Maclay and Macleay, 1879, p. 307; McCoy, 1890; Ogilby, 1890, 

 p. 184; Bridge, 1904 ("Cambridge Natural History", vol. VII, p. 444); Jordan and Clark, 

 1930, p. 10. Since Klein (1742), Dumeril (1865), and Garman (1913) have assigned the 

 generic name Cestracion to the Hammerhead Sharks, it seems advisable to reserve 

 the name Cestraciontidae for the family that includes these sharks, as done by Garman 

 (1913, p. 155). Nevertheless, it should be borne in mind that the name Cestraciontidae 

 has been widely used, particularly by paleontologists, for the family that includes the 

 genus Heterodontus (Cestracion). It is so used by Woodward, 1889 ("Catalogue Fossil 

 Fishes British Museum," Part I); Regan (1906 and 1908); and Zittel (1911, 1923 and 1932). 

 These are authors who retain the name Cestracion for the genus of Bullhead Sharks under 

 consideration. Goodrich (1909) uses the name Cestraciontidae for the family though he 

 seems to prefer Heterodontus for the genus. 



