Atiliti. GASTROPODA. 443 



KEY TO SPECIES. 



A. Shell biconic, smooth, a few oblique stria 1 on the base ; suture false- 



margined ; outer lip smooth inside . . . . . . liiconica. 



B. Shell fusiform, second whorl and base with tine spiral stria? ; suture 



simple ; outer lip with faint denticles inside . . . . daemon*. 



1. Atilia biconica, Suter, 1908. Plate 20, fig. 5. 



Atil-in biconica, Suter, P. Mai. S., viii, 1908, 182, pi. 7, f. 10. 



Shell small, biconic, very thin, translucent, not shining, yellowish- 

 white, with a distinct canal. Sculpture consisting of oblique spiral 

 threads upon the neck ; the growth-lines are microscopic, fine, and 

 dense. Colour yellowish-white, with a few light-brown zigzag mark- 

 ings. Spire elevated conic, of about the same height as the aperture 

 with canal ; outlines straight. Protoconch papillate, of 1| smooth 

 whorls. Whorls 5. regularly increasing, flattish, the last well rounded 

 at the periphery, considerably contracted below. Suture impressed, 

 very distinctly false-margined below. Aperture high and narrow, ob- 

 lique, angled above, produced below into a straight short and widely 

 open canal, truncated at its base. Outer lip distinctly convex at the 

 middle, contracted below, thin and sharp. Columella subvertical, 

 lightly convex in the middle, the spirals of the neck passing over it. 

 Inner lip obsolete. Operculum unknown. 



Diameter, 2-1 mm. : height, 4-7 mm. 



Animal unknown. 



Type in my collection. 



Hab. Hauraki Gulf, in 25 fathoms. 



Remark. The two specimens at my disposal for drawing up the 

 above diagnosis do not appear to be quite full grown. 



2. Atilia daemona, Webster, 1906. Plate 20. tig. 6. 



Ooliunlii'llii (tiewoiiti, \Vebst., T.N.Z.I., xxxviii, l!M)f> (UMJ>), :50iS. pi. 38. f. 8. 



Shell small, fragile, fusiform, smooth, with rufous markings. Sculp- 

 ture : The second whorl finely axially striated, lower part of the base 

 with about 15 obscure spiral striations ; the whole shell with fine 

 grcwth-stiise. Colour pale cream, dull, with rufous zigzag markings. 

 Spire narrowly conic, of the same height as the aperture ; outlines 

 almost straight. Protoconch papillate, the nucleus smooth. Whorls 

 5. regularly increasing, slightly convex ; base flatly contracted. Suture 

 impressed. Aperture subvertical. high and narrow, sharply angled 

 above, narrowed below, with a. distinct open canal. Outer lip lightly 

 arched, thin and sharp, with numerous faint denticles inside. Colu- 

 mella vertical, slightly arched, smooth. Inner lip narrow and thin, 

 produced over the faintly convex parietal wall. Operculum unknown. 



Diameter, 2 mm. ; height. 6 mm. (type). 



Animal unknown. 



Type in the Dominion Museum, Wellington. 



Hnb.Qft Great Barrier Island, in 1 10 fathom?. 



