714 STUDIES ON AUSTRALIAN MOLLUSCA, xii., 



Helcioniscus variegatus Blainville. 



Patella tramoserica Chemnitz, Conch. Cab., xi., 1795, p. 179, 

 PL 197, figs. 191 2, 1913; Id., Tapparone-Canefri, Zool. Magenta, 

 1873, p.l77; Id., Ten.-Woods, Journ. Roy. Soc. N.S.Wales, 

 xxii., 1888, p.140, P1.3, f.l, 2, P1.6, f.8; Id., Pritchard & Gatliff, 

 Proc. Roy. Soc. Vict., xv., 1903, p. 191; Helcioniscus tratnosericus 

 Brazier, These Proceedings, xviii., 1893, p.ll9; Id., Suter, Proc. 

 Malac. Soc, vi., 1905, p. 346; Id., Yerco, Trans. Roy. Soc. S.A., 

 XXX., 1906, p. 205, and xxxvi., 1912, p. 181; Id., Iredale, Trans. 

 N. Z. Inst., xL, 1908, p.380; Id., Shirley, Proc. Roy. Soc. Queens- 

 land, xxiii., 1911, p. 97. Not Patella tramoserica Martyn, Univ. 

 Conch., i., 1784, fig.l6; Menke, Moll. Nov. Holland. Spm., 1843, 

 p.33; von Martens, Malak. Blatt., xix., 1872, p.26. 



Patella variegata Blainville, Diet. Sci. Nat., xxxviii., 1825, 

 p.lOO ; Reeve(?), Conch. Syst., ii., 1842, P1.136, fig.l. Not 

 Patella variegata Reeve, Conch. Icon., viii., 1854, PL 16, fig.36a, 

 h,c = eucosmia Pilsbry, 1891. 



Patella jacksoniensis Lesson, Zool. Coquille, ii., 1830, p. 418. 



Patella diemenensis Philippi, Zeit.s. f. Malak., 1848, p. 162; 

 Helcioniscus diemenensis Gatliff & Gabriel, Proc. Roy. Soc. Vict., 

 xxL, 1908, p.382. 



Patella antipodum Smith, Zool. Erebus <fe Terror, 1874, Moll., 

 p.4, Pl.i., f.25; Helcioniscus antipodum Suter, Man. N. Z. Moll., 

 1913, p.79, PL7, fig.9. 



Patella sp., Maplestone, Month. Microscop. Journ., viii., 1872, 

 p.51, PL xxvii., fig. 3. 



The nomenclature of the common Sydney limpet has been a 

 difficulty to Australian conchologists. Under the name of Patella 

 tramoserica, it was excellently figured and described by Chemnitz 

 in 1795, and, until lately, his determination was current. 



But unfortunately the original P. tramoserica, figured in 1784 

 by Thomas Martyn, differs widely from the Sydney limpet by 

 being rounder, having the apex more central, fewer bolder ribs, 

 scattered black dots, interior submarginal angle and interior 

 broader, and fewer coloured radials than that of Chemnitz. A 

 ininor point is that Martyn misquoted his shell as from North- 



