1897.] NATURAL SCIENCES OF PHILADELPHIA. 363 



T. rufilabris and T. huonensis have been united by Mr. Smith, 

 and the union has been accepted by Australian and Tasmanian 

 writers. The differences mentioned above seem constant in the 

 rather small series of each before me; so that I would suggest a 

 renewed comparison of Australian and Tasmanian specimens by 

 someone having abundant material, in order that Mr. Smith's 

 decision may be confirmed or reversed. The series before me is 

 hardly ample enough to justify an opinion adverse to that of so 

 fair minded an investigator as my honored confrere of the British 

 Museum, but is still sufficient to raise a doubt. 



Genus ADEORBIS Wood. 



Adeorbis sigaretinus n. sp. PI. IX, figs. 4, 5, 6. 



Shell much depressed, shaped somewhat like the flat Sigaretus 

 species, upper surface slightly convex, base broadly and deeply um- 

 bilicated ; thin, white. Whorls 4?, the first minute, brownish, 

 elevated, the others convex, rapidly widening, the last very wide, 

 rounded at the periphery and base, as well as on the umbilical mar- 

 gin. Sculpture, close and fine wrinkles of growth, somewhat irreg- 

 ular, and fine, crowded, thread-like spiral strise. Aperture large, 

 very oblique, subcircular, only slightly excised by the parietal mar- 

 gin ; peristome thin and simple. Alt. 2, greater diam. 4 - 8, lesser 

 3*8 mm., or slightly larger, diam. 5 - 5 mm. 



Rockhampton, Australia (Dr. J. C. Cox). 



A. sigaretinus differs from A. striatellus from New Caledonia in 

 the larger size, wider last whorl, open umbilicus without a border- 

 ing keel, and different ornamentation ; Montrouzier's species being 

 distinctly punctured along the strise in the specimens before me, as 

 stated in the original description. The absence of a constricting, 

 delicate umbilical keel is a very obvious point of difference. 



Genus CORBULA Bruguiere. 



Corbula Coxi n. sp. PI. IX, figs. 1, 2, 3. 



Shell solid, strong and quite inequivalve, inequilateral, very ven- 

 tricose, the diameter nearly or quite equal to the height ; in fully 

 mature individuals, oblong, the beaks nearly central, anterior end 

 rounded, posterior end narrower, very obliquely truncated, much 

 narrowed below and projecting in a short truncate rostrum ; basal 

 margin moderately arcuate. Surface dull, whitish, with remnants 

 of a thin yellowish cuticle at the ends. Right valve somewhat 



