370 GASTROPODA. [Pectinibranrhia. 



spiral lira? and axial ribs, the last more or less dilated, rapidly excavated 

 at the base ; aperture pyriform, with a long, narrow, and curved 

 canal. 



2. Siphonalia dilatata, Quoy and Gaimard. 1833. Plate 43, 

 fig. 6. 



Fusus dilatatus, Q. & G., Voy. Astrol., ii, 1833, 498, pi. 34, f. 15, 16 ; Hutton, 

 C.M.M.. 8 ; Conch. Icon., iv, pi. 13, f. 49. Neptuncea dilatata, Quoy : 

 Hutton, M.N.Z.M., 50. Siphonalia dilatata, Q. & G. : Hutton, 

 T.N.Z.I., xvi, 228 ; Tryon, Man. Conch. (1), iii, 135, pi. 54, f. 356-59. 

 Fusus adusius, Philippi, Abbildungen, ii, 184547, Fusus, pi. 2, f. 7. 

 F. pastinacea, Reeve, Conch. Icon., iv, 1847, f. 50. Siphonalia oligostira, 

 Tate, T.R.S. S.Aust., xiv, 1891, 258, pi. 11, f. 6. 



Shell large, ovato-fusiform, solid, spirally lirate, and with a pro- 

 minent nodulous keel on the lower whorls. Sculpture consisting of 

 unequal spiral cords, strong ones alternating with much narrower 

 and lower lirfe, the sculpture extending over the base to the canal ; 

 the axial sculpture is formed by vertical, broad, and rounded ribs, 

 almost obsolete on the last two whorls, but produced into strong 

 triangular nodules, absent on the base ; the growth-lines are oblique 

 and flexuous, strong, and close together. Colour yellowish, the spiral 

 cords reddish-brown, aperture white. Spire conical, lower than the 

 aperture with canal ; outlines straight. Protoconch consisting of 3 

 smooth convex whorls, globose, the small nucleus slightly tilted. 

 Whorls about 10. the apex almost always broken off or much corroded ; 

 first very slowly but then rapidly increasing ; the upper whorls lightly 

 the lower ones strongly shouldered and carinated, shoulder straight, 

 the last whorl slightly convex below the carina. very rapidly con- 

 tracted at the base. Suture impressed, not deep, undulating. Aper- 

 ture slightly oblique, large, angularly pyriform, acutely angled above 

 and on the outer lip, produced below into a mther long, open, oblique, 

 and slightly curved canal, lightly sinuate at its base. Outer lip slightly 

 concave above the angle of the carina, sinuate below, the edge dis- 

 tinctly crenulated by spiral sculpture down to the end of the canal. 

 Columella somewhat oblique and arcuate, smooth. Inner Up rather 

 thick, extending beyond the pillar and over the parietal wall, narrowed 

 below on approaching the canal, and forming the inner slightly raised 

 and sharp margin of it, usually leaving a deep groove on the outside. 

 Operculum small, oval, pointed, and unguicul.iir 



Diameter, 42 mm. ; height, 75 mm. (type) : angle of spire. 50 C . 

 Diameter, 68mm. ; height, 115mm. (large Auckland specimen). 



Animal having a rather large foot, pointed posteriorly ; the tentacles 

 thick and short, with the eyes on the outer sides near the middle ; 

 sides of the foot marbled with vellow and reddish-brown ; sole yellowish. 



/ / 



Dentition. Troschel, Das Gebiss d. Schnecken, ii, 74, pi. 6, f. 17 : 

 Hutton, T.N.Z.I., xv, 119, pi. 13, f. F ; Verco, T.R.S. S.Aust,, 1895^ 

 pi. 3, f. 9 ; Atlas, pi. 1, f. 5. 



