422 GASTROPODA. [Pectinibranchia. 



1. Thais haustrum, Martyn, 1784. Plate 48. fig. 3. 



Buccinuiii haustrum, Mart., Un. Conch., i. 1784, f. 0. Purpura haustrum, 

 Mart,, Voy. Astrol., ii, 554, pi. 37. f. 4-8; Dieff. N.Z., 233 ; C.M.M., 16 ; 

 Crit, List, 21 ; J. de Conch., 1878, 19 ; M.X.Z.M., .16 ; Man. Conch. 

 (1), ii, KiO, pi. 43, f. 25 ; Conch. Icon., iii. pi. 2, f. 6. Polylropa (Lepsia) 

 haustrum, Mart. : Hutton, T.N.Z.I., xvi. 222. Pur pit rn (s. str.) haustrum, 

 .Mart.: Baker, Bull. Chicago Acad. 8ci.. ii, 1895, 182, footnote. Buc- 

 C'inuin haustorium, (imel., Syst. Nat., ed. xiii. i, 1790. 3498. 



She]] ovato-oblong. ventricose, solid, with a depressed spire and 

 wide aperture. Sculpture formed by smootli close spiral lira?, sepa- 

 rated by shallow linear grooves : young shells have deeper grooves 

 and crispate growth-lamella? ; sometimes obsolete axial ribs, produced 

 into rounded nodules upon the angle of the whorls, are present, dis- 

 appearing, however, in the adult shell : fascicle narrow, distinct. 

 Colour grey or purplish-brown : interior greyish-white, with a broad 

 band of brownish-purple on the outer lip, the edge white ; columella 

 white, a brown patch on the parietal wall. Spire low. concave above, 

 about one-third the height of the aperture. Protoconch subcylindrical. 

 of about 2 smooth whorls, the nucleus minute ; in adult specimens 

 the protoconch is almost always lost by erosion. Whorls 1 to 8. more 

 or less distinctly shouldered, the shoulder concave on the first three 

 whorls below the protoconch, flat or lightly convex on the later whorls, 

 the last whorl large, high and ventricose. convex ; base flattish. Suture 

 superficial. Aperture large, oval, rounded above, with a very short 

 and widely open canal below. Outer lip regularly convex, lightly and 

 broadly angled above, sharp, crenulated by the spiral sculpture, lirate 

 within. Columella vertical, somewhat excavated above, flattened: 

 smooth, and tapering to a fine point below. Inner Up large, 

 polished, spreading over the inner and upper part of parietal wall as 

 ;i thick callus, leaving a brown patch free. Fasciole slightly detached 

 from the inner lip. Operculum dark brown, oval, the outer side con- 

 vex, the inner nearly straight ; nucleus lateral, interior with gyratory 

 scars. 



Diameter, 39 mm. : height. 62 mm. 



Animal having a large quadrangular foot; the tentacles large, 

 nearly cylindrical, obtuse, the eyes near the ends. Colour white. 



Dentition (Troschel, Das Gebiss d. Schneckeii, ii. 132, pi. 12, f. 20 ; 

 Hutton, T.N.Z.I., xv. 12<. pi. 13. f. <)). Central tooth with "> cusps, 

 the median longest, the middle side cusps slightly shorter than the 

 lateral cusps. Lateral teeth long and pointed. 



Type lost. 



Hab. Throughout New Zealand, but more common in the south ; 

 Chatham Islands. On rocks between tide-marks. Brought to England 

 i>y Captain Cook. J^j 



Remark. Hutton mentions a variety in which the whole of the 

 interior is yellow; hub., Dunedin. I have not seen it. 



Maori. Kakara (fide Captain Bollons). 



