The Embryology of Heterodontus japonicus 657 



volume on "Cyclostomes and Fishes" published in 1909. Therefore it appears that the 

 portion of Dean's manuscript dealing with the phylogenetic aspects of cleavage is in- 

 tended as a repetition, with revision, of the contents of his article published in 1901. 



Considering these written records in their totality, none of the miscellaneous notes 

 and only certain portions of the manuscript are in a condition suitable for publication 

 without revision. These portions will be quoted verbatim. The manuscript was 

 originally typed, but much of it is so complicated by changes and additions (in script) 

 that both its style and its organisation are impaired. It seems best to treat these 

 portions as notes, to be rewritten and incorporated in the present article. Notwith- 

 standing its limitations. Dean's manuscript does give us much interesting information 

 not recorded elsewhere. 



In concluding the introductory portion of his manuscript. Dean made the following 

 acknowledgments : 



Before beginning his descriptive paper, the writer wishes to acknowledge numerous 

 courtesies which were extended him during various stages of his work. Especially to his 

 colleagues in Japan, Dean Mitsukuri and Professor Ijima his sincere thanks are due for ar- 

 rangements made at Misaki which resulted in the success of his collecting. He acknowledges 

 also his indebtedness to the assistant at the station, Mr. T. Tsuchida, whose never-faihng 

 patience and diplomacy stood in good stead with the fisherpeople. Finally, he is indebted 

 to Dr. Naohide Yatsu, whose help, at all seasons and in all ways both in Misaki and in New 

 York, greatly lightened the burden of the work. 



CLASSIFICATION AND SYNONYMY 



Regan (1908) grouped the species of living Cestraciontidae (Heterodontidae) into 

 two genera, Gyropleurodus and Cestracion. Nearly all later authors recognise only one 

 genus (variously designated Heterodontus, Cestracion or Centracion) of the living Hetero- 

 dontidae. The species included in this genus are collectively equivalent to those of 

 Regan's two genera. The common name Bullhead Sharks has been used by Jordan and 

 Evermann (1896), by Bridge (1904), and by many later authors, for the members of the 

 family Heterodontidae. 



HETERODOKTUS AND HETERODONTIDAE 



In the present article I have adopted the generic name Heterodontus for the six 

 species of Bullhead Sharks represented by specimens living at the present time. Of these, 

 the best-known is the Port Jackson Shark, H. pMlipi (Text-figure 4). For the genus 

 a synonym, Cestracion, is so firmly imbedded in the literature that it cannot be ignored. 

 Nevertheless, there are fairly convincing reasons why the name Heterodontus should 

 prevail. For my information regarding this matter I am indebted chiefly to Dumeril 

 (1865, pp. 423-426); Maclay and Macleay, (1879, pp. 303 and 309) and Carman (1913, 

 pp. 4, 155, and 180). 



