A REVISION OF TUK AUSl'UALIAN TUHRID^F: HEDLEY. 321 



Vai'. viNCBNTINUS Croxfc and Fischer. 

 (Plate liii., fig. 149.) 



Plenrotiwiii (Mmujelia) rincentiiM Crosse and Fiscliei-, Journ. de Conch., 



xiii., 1865, p. 422, pi. xi., fig. 6. 

 Mnitqelia viuceutina Angas, Pi'dc. Zool. Soc, 1865, p. 160, and 1877, p. 185. 



Id. Sowerby, Proc. Malac. Sue, ii., 1896, p. 80. Id. Pritchard and 



Gatliff, Proc. Roy. Soc. Vict., xii., 1900, p. 174. Id. Tate and May, 



Pioc. Linn. Soc. N.S.W., xxvi., 1901, p. 869. Id. Ve.co, Trans. Roy. 



Soc. S.A., xxxiii., 1909, p. 816. 

 Daphiiella viuceutina Tryon, Man. Condi., vi., 1884, p. 811, pi. xvi., tig. 91. 



Id. Cooke, Ann. Mag. Nat. Hist. (5), xvi., 1885, p. 85. 

 MmujiVni tdnrinaus Sowerby, Proc. Malac. Soc, ii., 1896, p. 29, pi. iii., 



fio-. 12, and var. onuUa, pi. iii., fig. 18. Id. Pritchard and Gatliff, 



Ptoc. Roy. Soc. Vict., xii., 1900, p. 175. fd. Tate and May, Proc. 



Linn. Soc. N.S.W., xxvi., 1901, p. 369. 

 Mam/ilia lineata Angas (not Reeve), Proc. Zool. Soc, 1865, p. 160. 

 Clathurella hroivniana (Tenison- Woods) Tate and May, Proc Linn. Soc. 



N.S.W., xxvi., 1901, p. 445. 



Hah. South Australia: — Rapid Bay (type of vinceiiHana, Angas); 

 Yankalilla Bay (type of aluciiuin.fi); St. B'rancis Island; 110 fathoms, 

 Beachport (Verco). Victoria: — Port Phillip; Western Port; Portland 

 (Pritchard and Gatliff). Tasmania: — Long Bay (May); King Island 

 (Tate). N. S. Wales: — Cabbage Tree Bay; 20 fathoms, Port Jackson 

 Heads (Brazier); Twofold Bay (self). Western Australia :— King Georges 

 Sound (Dakin). 



It is improbable that Cooke was correct in identifying this from the 

 Gulf of Suez. 



This is one of the most wide-spread and variable of AustraliaiT marine 

 temperate gasteropods. Typically G. pictvs is an elongate round-shouldered 

 shell, 11-5 mm. long and 3-5 mm. broad. Colour white, with a broad 

 band, liable to splitting and paler at the edges, of sienna brown, which 

 extends from the angle down to the suture ; also a narrow spiral biowii 

 thread above the angle. The ribs are eight to a whorl, distant, oblique, 

 continuous above, and gradually fading out on the base of the last whorl. 

 To the unaided eye the surface is smooth and glossy, but under the 

 microscope appear narrow, shar[)ly incised, spiral grooves, faint above, 

 and gradually becoming more distinct on the base ; of these there are 

 thirty on the last whorl. 



More common is the form called meredithice by Tenison-Woods. This 

 is comparatively broader, more acutely angled at the shoulder, 9*5 mm. 

 long, and 4 mm. broad. Colour pale cream, with brown dashes in the 

 intercostal spaces on the shoulder. The ribs are more prominent, and 

 vary from nine to twelve on a whorl. The spiral stria? multiply by 

 intercalation to about sixty on the last whorl. A colour variety, with 

 several narrow spiral brown bands, has been figured by Sowerby as 

 ornata. 



