286 Transactions. 



the middle, drawn out to a point on approaching the anterior 

 beak. Altitude, 157 mm. ; diameter, 5'75 mm. 



Type in the Colonial Museum, Wellington. 



Obs. This species is in its sculpture nearly allied to P. sep- 

 temlirata and trilirata, Harris, from the Eocene of Australia. 

 Three perfect specimens, one not quite adult, and a number of 

 fragments, were obtained, all dead shells. 



18. Pleurotoma (Leucosyrinx) augusta, n. sp. Plate XXII, 



figs. 11-17. 

 Shell fusiform, slender, fragile, spire and body-whorl of about 

 the same length, whorls with a spiral keel bearing small nodules, 

 canal long. Sculpture : The whorls are strongly keeled at the 

 periphery and with a row of gemmules set slightly oblique there- 

 on, on the last whorl there is a lower smooth keel present ; a 

 few inconspicuous spiral striae are on the area between the keels 

 and on the anterior extremity. The axial sculpture consists 

 of minute and irregular growth-lines only. Colour pure-white, 

 slightly shining. Spire pagodiform, elongated. Protoconch 

 smooth and shining, consisting of about two turns ; the nucleus 

 is slightly tilted, and with a distinctly marked smooth carina, 

 which is much strengthened on the succeeding whorl. Whorls 7, 

 regularly and rather slowly increasing, the last biangulate, con- 

 cave below the keels and produced into a rather long narrow 

 and truncated beak. Suture deep, minutely bimarginate. Aper- 

 ture angularly ovate, broadly angled above, contracted below 

 and terminating in a rather long open canal, which is some- 

 what turned to the left. The outer lip has its margin not quite 

 perfect, which perhaps lends to the scarcely fully adult ap- 

 pearance of the shell ; it is biangled and concave above, between, 

 and below the angles ; sinus broad and moderately deep, ex- 

 tending almost from the suture to the keel. The inner lip 

 spreads as a very thin narrow callus over the concave body 

 and the columella, which is nearly straight and slightly twisted, 

 ending in a fine point on the left margin of the canal. Altitude, 

 10-32 mm. ; diameter, 3-9 mm. ; angle of spire, 28°. 



Type in the Colonial Museum, Wellington. 



Obs. Only two specimens of this graceful little shell were 

 found. It is allied to Pleurotoma aha, Harris ( = pagoda, Hutton, 

 non Reeve)*, from which, however, it may be readily distinguished 

 by the gemmules on the keel and the distinct carina on the 

 protoconch, both of which characters are absent in the Tertiary 

 fossil. 



* Cat. Teri, Moll. Brit. Mus., Australasia, part i, p. 4.">. 



