GASTROPODA. 441 



interspaces i axial riblets irregular, low and rounded, more distinct 

 on the spire, often obsolete, they are frequently cutting up the 

 spirals into minute gemmules. Colour light reddish-brown, some- 

 times a pale band around the periphery, occasionally a darker narrow 

 band at the suture. Spire conical, a little higher than the aperture. 

 Protoconch of 2 whorls, somewhat globose, smooth and polished, the 

 nucleus oblique to the succeeding whorl. Whorls 5, lightly rounded, 

 a little contracted at the base. Suture impressed, usually margined 

 with a wider riblet. Aperture narrow, oblique, angled above, broadly 

 truncated at the base. Outer lip thin, a little flattened, broadly 

 sinuate above, thickened at the middle. Columella almost straight, 

 concave, smooth, twisted and with a slight fold below. Inner lip thin 

 and narrow. Op&rculum unknown. 



Diameter, 1-7 mm. ; height, 4*6 mm. 



Animal unknown. 



Type in the Dominion Museum, Wellington. 



Halt. Whangaroa Harbour, type (C. Traill). 



6. Alcira transitans, Murdoch, 1905. Plate 20, fig. 3. 



Columbella transitans, Murd., T.N.Z.I., xxxvii, 1904 (1905), 224, pi. 7, f. 13. 



Shell small, subulate, somewhat shining, spirally lirate, brown. 

 Sculpture consisting of close and numerous subequal spiral riblets, the 

 interstices narrow and not very deep, 5 to 8 on the penultimate and 

 15 to 20 on the last whorl, occasionally one or two riblets at the peri- 

 phery of the body-whorl are broader than the others ; the whole crossed 

 by irregular fine growth-lines. Colour light or dark brown, olive, 

 or reddish-brown, sometimes with a lighter band immediately below 

 the suture and produced around the periphery of the last whorl, but 

 occasionally this band is darker than the ground-colour. Spire high, 

 subulate, about 1| times the height of the aperture ; outlines straight. 

 Protoconeh of 2| whorls, smooth and shining, the nucleus globose. 

 Whorls 6, regularly increasing, flattened ; base very little contracted, 

 Suture impressed. Aperture oval, acutely angled or subchannelled 

 above, slightly narrowed below, without a canal, base lightly notched. 

 Outer lip simple, uniformly curved, sharp. Columella vertical, very 

 little excavated, smooth, with a basal plait. Inner lip very narrow 

 and thin, extending over the straight parietal wall. Operculum un- 

 known. 



Diameter, 2-2 mm. ; height, 5-1 mm. (type). 



Animal unknown. 



Type in the Dominion Museum, Wellington. 



Hab. Whangaroa Harbour, type (0. Traill) ; Stewart Island ; 

 Bounty and Snares Islands, in 50 fathoms (Captain Bollons) ; Auck- 

 land Islands (Professor W. B. Benham) ; Campbell Island (Professor 

 C. Chilton). 



Fossil in the Pliocene. 



