312 



Mnnaelia alternata, Tenison-Woods, Proc. Roy. Soc, Tas- 

 mania, (1878) 1879, p. 39; Tate and Mav, Proc. Linn. Soc, New 

 South Wales, 1901, vol. xxvi.,p. 369. 



Dredged in from 14 to 26 fathoms in Gulf St. Vincent 

 and Investigator Strait ; in Encounter Bay in about 5 fath- 

 oms (W. Reed). Taken on the beach of Banks Island, Spen- 

 cer Gulf. 



I think, probably, M. tasma/iica grades from a long, 

 narrow form with sharply-angulate whorls through M. jack- 

 soniensis, and then through M. niifralis into M. australis, 

 and forms one variable species. 



Mangilia adcocki, Sowerby. 



Mnngilia adcocki, Sowerby, Proc. Mai. Soc, London, 1896, 

 vol. ii., p. 29, pi. iii., fig. 18; Pritchard and Gatliff, Proc Roy. 

 Soc, Victoria, (1899) 1900, p. 174, "Western Port, etc."; Tate and 

 May, Proc. Linn. Soc., New South Wales, 1901, vol. xxvi., p. 

 370, "North coast of Tasmania." 



Mangilia bella, Adams and Angas, Proc. Zool. Soc, London, 

 1863, p. 419, pi. xxxvii., fig. 6 (non Hinds). Type locality — 

 "Rapid Bay, St. Vincent Gulf." 



Dredged in 14 and in 22 fathoms Investigator Strait 

 and taken abundantly on the beach on Troubridge shoal, and 

 of Antechamber Bay, Kangaroo Island. 



Mr. Gatliff records its variations. 



Mangilia gatliffi, n. sp. PL xxviii., fig. 9. 



Shell small, white, solid, shining, elongate-oval, blunt, 

 of 5 whorls, including a protoconch of 2 smooth convex 

 whorls, and a very flatly convex apex. Spire-whorls sloping 

 convex. Suture distinct, subcanaliculate, undulating, mar- 

 gined. Body- whorl nearly as long as the spire, slightly at- 

 tenuated at the base and truncate. Aperture oval, slightly 

 narrowed behind, wide in front, notched, without a canal. 

 Outer lip straightly convex, with a shallow, wide sinus be- 

 hind, sharp, not inflected, smooth within. Inner lip nar- 

 row, smooth, applied, free at the front, with a callus pos- 

 teriorly at the junction with the outer lip. Columella sub- 

 concave, joining the body- whorl at a very open angle. Spiral 

 sulcations equidistant, 9 in the penultimate, 17 in the body- 

 whorl. Axial accremental striae, distinct under the micro- 

 scope, cross the spirals, sinuous, comparatively distant, espe- 

 cially on the body-whorl. 



Dim. — Length, 5"25 mm.; of aperture, 2"25 mm. ; 

 breadth, 225 mm. 



Locality. — Type from 17 fathoms Backstairs Passage, 

 with 2 others ; Gulf St. Vincent, 3 good ; in 15-20 fathoms 



