860 MR. G. F. ANGAS ON NEW BIVALVE SHELLS. [Nov. 5, 



Hab. China seas ? {Belcher). Coll. Hanley. 

 An exquisitely sculptured species of great beauty, unique in the 

 collection of Mr. Hanley. 



>s Semele aspasia, n. sp. (Plate LIV. fig. 3.) 



Shell orbicularly ovate, nearly equilateral, subequivalve, mode- 

 rately thin, yellowish white, concentrically very finely and regularly 

 sculptured with close-set erect frilled laminae, the interstices being 

 crossed by fine thread-like descending striae that correspond to the 

 undulations of the transverse frills ; concentric ridges smooth and 

 more distant at the umbones ; interior of the valves very faintly 

 tinged with flesh-colour. 



Long. 12^, alt. 10, lat. 6 lines. 



Hab. 1 In coll. Hanley. 



This species differs from £. phryne in being thinner, more ovate, 

 and less tumid in form, and in the transverse sculpture consisting of 

 elegantly undulating frilled erect laminae, whilst the interstices 

 between the descending striae are not squares but narrow paral- 

 lelograms. 



\Z~ Semele phryne, n. sp. (Plate LIV. fig. 4.) 



Shell suborbicular, subequilateral, equivalve, somewhat tumid, 

 solid, white, very finely regularly concentrically sculptured with 

 close-set thread-like striae, the interstices of which are crossed 

 throughout by similar thread-like descending stria?, giving the surface 

 of the valves a beautifully neat and regular reticulated appearance, 

 excepting at the umbones, where the concentric ridges are more 

 distant and the descending striae finer and nearly obsolete ; posterior 

 side very slightly truncate and sinuate below, with a nearly obsolete 

 flattened ridge extending upwards towards the umbo on the right 

 valve ; interior slightly tinged with flesh-colour towards the base. 



Long. 15, alt. 14, lat. 8 lines. 



Hab. ? In coll. Hanley. 



A solid, white, somewhat tumid species, very regularly and finely 

 latticed throughout, the interstices taking the exact form of minute 

 squares. 



(/ Lucina citrina, n. sp. (Plate LIV. fig. 5.) 



Shell quadrately orbicular, very inequilateral, equivalve, rather 

 thin, primrose-yellow, paler towards the base, concentrically sculp- 

 tured with very fine thread-like striae, that become more distant as 

 they approach the base ; lunule very small, depressed ; umbones 

 tumid ; beaks small, incurved ; anterior side produced and somewhat 

 flexuous above ; interior of valves crenate at the edge, pale yellow. 



Long. 4,<alt. 3|, lat. 2\ lines. 



Hab. ? Coll. Hanley. 



A small species, of a peculiar primrose-yellow colour. 



Lucina rosea, n. sp. (Plate LIV. fig. 6.) 



Shell elongately orbicular, equivalve, inequilateral, a little tumid, 



