1894.] NATURAL SCIENCES OF PHILADELPHIA. 69 



LIST OF PORT JACKSON CHITONS COLLECTED BY DR. J. C. COX, WITH A 

 REVISION OF AUSTRALIAN ACANTHOCHITID^. 



BY HENRY A. PILSBRY. 



The followiiig pages contain a part of the results of the study of a 

 collection of the Chitons of Port Jackson, New South Wales, Australia, 

 recently made by Dr. J. C. Cox, the well-known Australiau con- 

 chologist. Dr. Cox, with great liberality, transmitted to the 

 Academy a large number of specimens both dry and preserved in 

 spirits, with the request that they be studied and reported on. I am 

 therefore enabled to make a contribution toward an exact knowledge 

 of the distribution of the Polyplacophora inhabiting the New South 

 Wales coast, as well as to elucidate several important points relating 

 to particular species and genera. 



With the exception of a few records by Mr. E. A. Smith, of Port 

 Jackson species collected by Coppinger,^ and by Professor Haddou 

 of those collected by the "Challenger,"'^ our knowledge of the Chi- 

 ton fauna of the New South Wales coast is limited to the lists pub- 

 lished by Mr. G. F. Angas^ many years ago. At that time, the 

 morphology of Polyplacophora was very imperfectly understood ; 

 and consequently these admirable lists, which have been so helpful 

 to subsequent conchologists in dealing with most families of mollusks, 

 are almost useless in the study of Chitons, so many errors do they 

 contain. 



Angas, however, found some forms in Port Jackson which subse- 

 quent observers have not yet found, and among them several, such 

 as Microplax Grayi, of exceptional interest to the general student 

 on account of their peculiar and ill-understood features. 



To direct the attention of local malacologists to these forms, if for no 

 other reason, it is thought expedient to quote Angas' list of species, 

 the modern equivalents of his names, so far as known to me, being 

 given in another column. 



'Zool.Coll. H. M. S. "Alert." 



•■^Challenger Reports, Vol. XVII. 



sproc. Zool. Soc. London, 1867, p. 221. and 1871, p. 97. 



