SYKES : POLYPLACOPHOEA FEOM POKT PHILLIP. 91 



14. AcANTHOCHiTEs Bednalli, Pilsbiy. 



AcantJiocliites Bednalli, Pilsbry : Proc. Acad. Nat. Sci. Pliilad. 1894, 

 p. 81, pi. ii, figs. 7-11. 



Two examples of this species, recently described, from St. Vincent 

 Gulf. I have to thank Mr. Pilsbry for the identification. 



15. ACANTHOCHITES PiLSBEYI, n.Sp. PI. YI, PigS. 6, 6fl5. 



Shell elongate ; the valves of general greyish hue ; girdle 

 olivaceous. Intermediate valves (the exposed poi'tions) convex behind, 

 sculptured on the latere -pleural areas with coarse, round, scattered 

 pustules. In valves ii to viii there is a narrow band -like jugal area, 

 which appears smooth to the naked eye, but under a lens is seen 

 to be obscurely striate both longitudinally and transversely. 

 Posterior valve small, having the mucro obtuse and posterior ; the 

 posterior slope is nearly vertical. Girdle rather narrow, with eighteen 

 tufts. The interior of the valves is of a white colour. Posterior 

 valve with two slits, median with one, anterior not observed. Length 

 about 10 mm., breadth 3-5 mm. 



Only a single specimen, which I have much pleasure in dedicating 

 to Mr. Pilsbry, who has done so much to advance our knowledge of 

 the Australian species of AcmithocJutes. It falls in his "Key"' to the 

 Australian species between A. Coxi, Pils., and A. granostriatus, Pils. 

 " A typical Acanthochites, but different from any known to me from 

 Australia in the narrow band-like jugal tracts, smoothish and 

 transversely striate, the latere -pleural areas being sculptured as 

 in A. Coxi, Pils., which species the tail-valve also resembles. The 

 specimen is probably young" (Pilsbry in MS.). To this extremely 

 lucid description I have nothing to add. 



16. Acanthochites (Notoplax) speciosus (H. Adams). 



Cnjptoplax {Notoplax) speciosus, H. Adams: Proc. Zool. Soc. 1861, 



p. 385. 

 Acanthochites {JSfotoplax) speciosus, H. Ad. : Pilsbry, Man. Conch., 



ser. I, vol. XV, p. 32, pi. i, figs. 23-6 ; Proc. Nat. Sci. 



Philad. 1894, p. 83, pi. iv, figs." 3 1-3. 



This species, originally known from Tasmania and Flinders Island, 

 has I'ecently been noted from New South Wales. We are now able to 

 extend its range to Victoria. 



17. Acanthochites (Notoplax) Matthewsi, Bcdnall and Pilsbry. 



Acanthochites {Notoplax) Matthewsi, Bednall and Pilsbry: Nautilus, 

 vii, p. 120; Proc. Acad. Nat. Sci. Philad. 1894, p. 83, 

 pi. iv, figs. 27-30. 



One damaged specimen : the remarkable sculpture (longitudinal 

 riblets) on the pleural tracts will serve to distinguish this species. It 

 was described from South Australia. 



1 Troc. Acad. Nat. Sci. Thil. 1894, p. 77. 



