1871.] MR. G. F. ANGAS ON NEW AUSTRALIAN SHELLS. 1") 



the body-whorl ; columella with four plaits, the posterior one a little 

 obliquely descending. 



Length 1| line, breadth 1 line. 



Hab. From shell-sand, coast of New South Wales. 



7. Scala (Cirsotrema) morchi, n. sp. (Plate I. fig. 7.) 

 Shell acuminate, solid, whitish ; whorls 9, rounded, decussated 



with longitudinal ribs and more numerous transverse ridges, the 

 longitudinal ones evanescent at the base ; sutures impressed; aperture 

 nearly circular, entire. 



Length 5 lines, breadth 1 line. 



Hab. Dredged near the " Sow and Pigs," Port Jackson {Brazier). 



8. Mathilda elegantula, n. sp. (Plate I. fig. 8.) 



Shell elongately acuminated, thin, semitransparent, whitish ; 

 whorls 14, nearly flat, each ornamented witb three rounded trans- 

 verse ribs, the one below the suture the smallest, the interstices 

 between the ribs finely longitudinally striate ; striae raised and very 

 thin ; base of last whorl smooth and flattened ; nucleolar whorl 

 sinistral ; aperture subquadrate ; outer lip thin, acute ; columella 

 straight, a little produced in front. 



Length 5^ lines, breadth 1 line. 



Hab. Dredged in Lane Cove Creek, Port Jackson {Brazier). 



This exquisitely sculptured shell appears to belong to Semper's 

 genus Mathilda, which he separates from Eglesia in consequence of 

 the nucleolar whorl being sinistral. It, however, has much in com- 

 mon with the latter genus, the nucleolar whorl of its typical species 

 not having, as far as I know, been yet observed. 



9. Agatha australis, n. sp. (Plate I. fig. 9.) 



Shell acuminately ovate, rather thin, opaque, whitish ; whorls 8, 

 sli°4itlv convex, suture a little canaliculated ; spire acuminate, nu- 

 cleus sinistral ; aperture narrowly ovate ; outer lip simple, thin ; 

 columella furnished with a strong spiral plait. 



Length 4 lines, breadth 1 h line. 



Hab. Port Jackson, N. S. Wales. Dredged near " Sow and Pigs " 

 reef. 



10. Odostomia simplex, n.sp. (Plate I. fig. 10.) 



Shell acuminately ovate, rather solid, smooth, whitish ; whorls 7|, 

 rather flat, a little angulate at the sutures ; spire acuminate ; aper- 

 ture subovate ; outer lip simple, furnished within with elevated striae ; 

 columella with a single sharp transverse plait. 



Length 2 lines, breadth J line. 



Hab. Port Jackson, N. S. Wales. Dredged off " Sow and Pigs." 



11. Syrnola tincta, n. sp. (Platel.fig.il.) 



Shell subulate, rather solid, smooth, shining, whitish, irregularly 

 banded and marked with brown; whorls 10g, nearly flat; sutures 



