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Show 1871.] MR. G. F. ANGAS ON NEW AUSTRALIAN SHELLS. 15 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 with three rounded transverse ribs, the one below the suture the smallest, the interstices between the ribs finely longitudinally striate; strise 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 common 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, sliglitly convex, suture a little canaliculated ; spire acuminate, nucleus sinistral; aperture narrowly ovate ; outer lip simple, thin ; columella furnished with a strong spiral plait. Length 4 lines, breadth 11 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 ; aperture subovate ; outer lip simple, furnished within with elevated strise; columella with a single sharp transverse plait. Length 2 lines, breadth | line. Hab. Port Jackson, N. S. Wales. Dredged off " Sow and Pigs." II. 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 |