18G7.] MR. G. F. ANGAS ON NEW AUSTRALIAN MOLLUSCA. 909 



nearly straight, the umbonal slope angulated ; ventral margin convex. 

 The hinge witli the cartilage processes small. Pallial sinus extend- 

 ing beyond the umbones. 



Long. 7, alt. 4i, lat. 2| lines. 



Hab. Dredged off Ball's Head, Port Jackson, in 1.5 fathoms. 



DOSINIA PUELLA, n. s. (PI. XLIV. fig. 4.) 



Shell small, orbicular, rather thick, moderately convex, whitish, 

 finely and closely irregularly concentrically striated ; umbones some- 

 what produced and approximate ; ligamental area but slightly exca- 

 vated ; lunule small, superficial, not impressed. 



Long. 6, alt. 6, lat. 3 lines. 



Hab. Botany Bay, New South Wales. 



SUNETTA ADELINE, U. S. (PI. XLIV. fig. 5.) 



Shell smooth, elongately ovate, anterior side rounded, posterior 

 slightly truncate ; ventral margin somewhat bulged in the middle, a 

 little tumid towards the umbones, whitish, painted with angular cho- 

 colate markings along the posterior slope, with a few of the same 

 description, but fainter, proceeding downwards from the umbones, 

 and covered towards the margins with a very slight pale olive epi- 

 dermis ; ligamental area narrowly excavated ; lunule strongly defined 

 and narrow, with the lips projecting beyond the line of the dorsal 

 slope ; interior white, tinged with flesh-colour, edges of the valves 

 finely crenated within. 



Long. 8, alt. 6, lat. 3 lines. 



Hab. Dredged in deep water near Port-Jackson Heads. 



This species differs from Meroe Mans, Reeve (from Cochin China), 

 in being smaller, much less tumid, more rounded at the ventral mar- 

 gin, and somewhat truncate posteriorly ; the lunule also is prominent 

 and projecting, whereas in M. Mans it is flat ; and the dark purple 

 spot so characteristic of the interior of the latter is wanting in the 

 species described above. 



Spisula cretacea, n. s. (PI. XLIV. fig. 6.) 



Shell triangularly ovate, solid, rough, chalky-white, rudely cou- 

 centrically striated ; umbones nearly central, acute, approximate ; 

 basal margin arcuate ; anterior side rounded ; posterior side slightly 

 angled, and obtusely keeled from the umbones ; the dorsal area 

 broad, with the margin slightly arcuate ; lateral teeth elongate and 

 strongly cross-ribbed on both sides. 



Long. 9, alt. 6|, lat. 5 lines. 



Hab. Dredged at Port Stephen, off Tarlee. 



Spisula producta, n. s. (PI. XLIV. fig. 7.) 



Shell small, rather solid, ovately cuneiform, white, finely irregu- 

 larly concentrically striated, and covered with a thin membranaceous 

 epidermis towards the sides and basal margin ; umbones tumid, acute, 

 approximate ; anterior side rounded, shorter ; posterior side pro- 



