81 



Affinities. — This new species resembles E. polygyra, H. 

 Adams (type compared), but it has a blunter apex, and the 

 aperture is of a different shape. The rhomboidal aperture 

 differentiates it from E. polygyra and E. augur, and in addition 

 is is distinguishable from the latter by a subangular base. 



Localities. — South A-USTRALIA ; Holdfast and Aldinga Bays 

 (R. Tate, many examples). 



(b) Shell tortuous. 



In the following descriptions I have employed the phrase 

 " torsion in one or two directions," that is lateral or vertical, or 

 both. Hitherto the torsion has been described as either to the 

 left or right, upwards or backwards ; but as these positions are 

 relative to the aperture, it is obvious that if the spire be inclined 

 to the left at a given stage of growth, the addition of a half-turn 

 to the body-whorl will bring the torsion to the right. The same 

 change will happen when the torsion is in a vertical plane : at 

 one stage, if the inclination be forwards, it becomes backwards 

 with the increase of a half-turn. 



The application of the terms expressive of the direction of the 

 torsion can only be absolute as to the plane of the twist, that is 

 whether vertical or lateral. It is only possible to extend their 

 application when growth of the shell shall have ceased, or if the 

 shell-growths be periodic and of one or more complete turns. 

 This latter condition is certainly presented by E. Tenisoni, as 

 pointed out to me by Dr. Verco, as traces of periodic growths are 

 visible on the spire, and in alignment on the one side. But 

 there are no distinctive features by which to recognise an adult 

 Eulimid. 



S. E. Tenisoni, T^-yon, Man. Conch., vol. VIII., 1886, p. 269, t. 68, f. 16. 



E. micans, Tenison- Woods, Proc. Roy. Soc, Tasmania, for 

 1875, p. 144 (1876), non Carpenter. 



The early spire-whorls are very narrow, and impart to the adult 

 shell an almost mucronate termination. The apical whorl is 

 blunt, higher than wide, but it cannot be described as mamil- 

 lated. 



The shell attains to a length of 6 mm., and width of 2*5 mm.; 

 the spire-whorls nine in number ; the torsion of the spire is in 

 two directions ; aperture roundly oval. 



This species makes a near approach to E. brevis, Sow. (with 

 the type of which I have made comparison), but the shell is more 

 tortuous, and the body-whorl more depressed. 



Distribution. — Tasmania {Ten.-Woods, type); Victoria!; 

 South Australia, Holdfast, Aldinga, Streaky, and Fowler Bays, 

 Wauraultie, Spencer Gulf (E. Tate, many exs.). 



