Victorian Marine Mollusca. 155 



Obs. — This species was identified by Bednall as P. glauca, Q. 

 and G., and he sent a specimen to Thiele, who said it was not 

 that species, and named it P. bednalli. 



Plaxiphora costata, Blainville. 



1825. Chiton costata, Bl. Diet. Sci. Nat., vol. XXXVL, 



p. 548. 

 1893. Chiton costatus, Bl. Pilsbry, Man. Conch., v. XV., 



p. 105. 

 1902. Plaxiphora petholata, Sowerby. Frit, and Gat., 



these Proc, v. XV., p. 204. 



Genus Acanthochitona, Gray 1821, replaces Acanthochites, 



Risso 1826. 



AcANTHOCHiTONA COST ATA, Adams and Angas. 



1864. Acanthochites costatiis. Ad. and Ang. P.Z.S., 



Lond., p. 194. 

 1893. Acanthochites costatus, Ad. and Ang. Pilsbry, 

 Man. Conch., v. XV., p. 40, pi. 3, f. 74. 

 //06.— Portland. 



Obs. — Size of type. Length 18, breadth 7 mm. This was ob- 

 tained in New South Wales; it is also recorded in Queensland; 

 South Australia; and Tasmania. 



ACANTHOCHITONA GATLIFFI, Ashby. 



1919. Acanthochiton gatliffi, Ashby. T.R.S., S.A., v. 



XLIIL, p. 398, pi. 42, f. 2-5. 

 1921. Acanthochiton gatliffi, Ashby. These Proc, v. 

 XXXIII., for 1920, p. 152. 

 Hab. — Dredged off Point Cook, Port Phillip, in 8 fathoms. 

 Obs. — Size: Length 6, breadth 3 mm. 



AcANTHOCHiTONA TATEi, Torr and Ashby. 



This proves to be a synonym of A. granostriatus, Pilsbry. 



Genus Rhyssoplax, Thiele 1893. 



Under this new genus are now classed the species listed as 

 Chiton bednalli, Pilsbry; C tricostalis, Pilsbry; C. jugosus, 

 'Gould ; C. exoptanda, Bednall ; C. verconis, Torr and Ashby ; and 

 «C. calliozona, Pilsbry. 



7a 



