99 



18. Plaxiphoka costata, Blain. 



Chiton costatus, Blain, Diet. Sc. Nat., xxxvi., p. 548; 

 Pilsbry, Man. Conch., vol. xv., p. 105. 



Plaxiphora glauca, Quoy and Gaim. ■ Bednall, Proc. Mai. 

 Soc, London, vol. ii., part 4, April, 1897. 



Chiton glaucus, Quoy and Gaim., Voy. Astrolabe, Zool. iii.„ 

 p. 376. 



Plaxiphora glauca, Pilsbry, Man. Conch., ser. i., vol. xiv. r 

 p. 325. 



Plaxiphora costata, Iredale, Proc. Mai. Soc, London, voL 

 ix., part 2, June, 1910, p. 97. 



Mr. Iredale says: "Blainville's costatus is easily recog- 

 nizable as the species I have noted as glauca, Q. et G." He 

 agrees with Dr. Thiele in his "Revision des Systems der 

 Chitonen" in placing P. jjetholata, Sow., as all) Ida of Blain- 

 ville and P. glauca, Q. et G., as costatus, Blain. 



Good specimens of P. costata were found at Rottnest 

 Island, Albany, and Bunbury, and valves were plentiful at 

 Ellenbrook and Yallingup. 



I notice that Blainville took P. costata, or, as he named 

 it, Chiton costatus, from the "Port of King George. " Wes- 

 tern Australia, therefore, is the first locality where the 

 shell was found. Quoy and Gaimard found it in d'Entre- 

 casteaux Channel, Tasmania. 



19. Acanthochites asbestoides, Smith, 1884. 



Chiton ( Acanthochiton) asbestoides (Carpenter, MS.), Smith, 

 Zool. Coll., H.M.S. "Alert," p. 833; Pilsbry, Man. Conch., 

 ser. i., vol. xv., p. 17. 



Acanthochites asbestoides, Carpenter; Pilsbry, Proc. Acad.. 

 Nat. Sec, Philacl., 1894. 



Two specimens taken at Albany. 



20. Acanthochttes speciosus, H. Adams, 1861. 



Cryptoplax (noloplax) speciosus, H. Adams, Proc. Zool. Soc... 

 1861, p. 385. 



Acanthochites speciosus, H. Adams, Pilsbry, Man. Conch. r 

 ser. i., vol. xv., p. 32. 



One specimen of this rare shell was found at Rabbit 

 Island, near Albany. 



21. Acanthochites verconis, Torr and Ashby, 1898. 



Acanthochites Verconis, Torr and Ashby, Trans. Roy. Soc.,. 

 S.A., 1898, p. 217. 



One specimen dredged from 20 fathoms at Geographe 

 Bay. Mr. Hedley, conchologist, of Sydney, is unable to 

 separate A. Verconis from A. Wilsoni, of Sykes, Proc. MaL 

 Soc, London, vol. ii., part 2, July, 1896. 

 d2 



