20 MR. G. F. ANGAS ON NEW AUSTRALIAN SHELLS. [Jan. 3, 



pressed ; aperture ovate ; outer lip thin ; columella nearly straight, 

 white, with a narrow dark brown band behind. 



Length 8 lines, breadth 4 lines. 



Hab. Sinclair's Range, King George's Sound. 



This pretty species belongs to the same natural group as B. an- 

 gasiana, Pf., B. baconi, Benson, and B. mastersi, Cox, all from the 

 S.W. region of the Australian continent. 



29. Corbula venxjsta, n. sp. (Plate I. fig. 29.) 



Shell triangularly ovate, solid, rather ventricose, inequivalve, irre- 

 gularly rugosely plicately concentrically striated, the striae finer and 

 more even towards the umboes, white, beneath a thin yellowish epi- 

 dermis, with a short carnelion-coloured ray at the anterior side of the 

 umbones ; umbones tumid, approximating ; umbonal ridge strong and 

 angulate ; anterior side rounded ; posterior side narrowed and sub- 

 truncate. 



Length G lines, alt. 4, lat. 3 lines. 



Hab. Dredged on the " Sow and Pigs " bank, Port Jackson. 



The only other species of the genus distinguished by the red um- 

 bonal ray is, as far as I am aware, O. marmorata, Hinds, which is 

 a very much smaller shell, quite smooth, and comes from the west 

 coast of Veragua. 



30. Ne^era (Leptomya) pura, n. sp. (Plate I. fig. 30.) 



Shell thin, semitransparent, white, subovate, rather convex, equi- 

 lateral, equivalve, ornamented with rather distant concentric raised 

 lines ; umbones tumid, rather prominent, approximating ; anterior 

 side rounded, posterior side obliquely truncate ; ventral margin 

 arcuate, slightly sinuate posteriorly ; umbonal ridge distinctly angu- 

 late. 



Length 6 lines, alt. 5, lat. 3 lines. 



Hab. Lane Cove, Port Jackson, New S. Wales ; in sandy mud 

 (Brazier). 



31. Mactra (Spistjla) flxjviatilis, n. sp. (Plate I. fig. 31.) 



Shell elongately ovate, rather compressedly convex, inequilateral, 

 irregularly concentrically very finely ridged, covered with a rusty - 

 brown epidermis ; umbones small, submedian ; anterior extremity 

 rounded ; posterior extremity somewhat produced and acuminately 

 oval ; ventral margin arcuate. 



Length 6 lines, alt. 4, lat. 2f lines. 



Hab. Dredged in brackish water, in 2 fathoms, Hawkesbury River, 

 New S.Wales (Brazier). 



32. Crassatella fulvida, n. sp. (Plate I. fig. 32.) 



Shell subtriangularly ovate, inequilateral, rather compressed, yel- 

 lowish, faintly streaked and mottled with pale orange, concentrically 

 strongly ribbed, the interstices rather wider than the ribs ; umbones 

 pointed, rather small, approximate, tinged with orange-red ; dorsal 

 margin laterally rather concave ; ventral margin strongly arcuate ; 



