160 RECORDS OF THE ACSTRALIAX MUSEUM. 



Pilsbrv comments on this controversy."* He suggests that 

 • means for discrimination might be furnished by the gizzard plates. 



Such plates from a Norwegian specimen are figured by Sars'* 

 - and more elaborately from a French specimen by Guiart'* and 



Vayssiere. " " 



For contrast with these I now ofier figures from Sydney 

 material of the small ventral and one of the larger dorso-lateral 

 plates of P. angasi. Unfortunately I have no plates of the 

 European form for actual comparison. The likeness to a cocked 

 hat noted by the original authors holds good with our specimens. 

 Angas stated that the gizzard of the Australian form resembles 

 that of the British P. quadripartita ( = P. aperta).' ^ It has l>een 

 generally overlooked that tigures of the radula of a Victorian 

 specimen were published by Maplestone. "^ 



"^^ Pilsbry— Man. Couch., xvi., 1895, p. 8. 

 '5 Sars — Moll. Reg. Arct. Norv., 1878, pL xi. (anat.), fig. 15. 

 '6 Guiart— Mem. Soc. Zool. France, xiv., 1901, p. SO, figs. 40, 41, 42. 

 "^^ Vayssiere — Ann. Mus. Marseilles, Zool., ii., 1SS5, p. 33, pi. i., 

 J figs. 20, 21. 



"^ Angas — Proc. Zool. Soc, 1S67, p. 227. 

 ^^ Maplestone — Monthly Micro. Journ., 1S72, p. 53, pL xxvii., fig. 23. 



