PSEUDOMPHALUS. 115 



Subgenus PSEUDOMPHALUS, Ancey, 1882. 

 D. FABREF, Crosse. PL 24, figs. 85-87. 



Widely and perspcctively umbilicated, nautiliform, profoundly 

 biconcave, last whorl largely enveloping the others, especially 

 above, translucent, subflexuosely closely striate, reddish brown. 

 Diam. 15, alt. 8'5 mill. 



New Caledonia. 

 D. MEGEI, Lambert. ' PL 24, figs. 82-84, 59, 60. 



Umbilicated, nautiliform, profoundly biconcave, translucent, 

 very closely finely striate, chestnut-brown. Diam. 9, alt. 7 mill. 



New Caledonia. 



Is smaller, with fewer whorls than the preceding species of 

 which it may be the young. 



Crosse describes a variety (figs. 59, 60) with only 4^ (instead 

 of 5) whorls, dark reddish brown, the apex immersed, whitish ; 

 diam. 8'25, alt. 5'5 mill. Probably younger? 



D. GENTILSIANA, Crosse. PL 24, figs. 62, 63. 



Perforated, subnautiliform, numerously, closely, slightly 

 costulate ; light olivaceous ; whorls 5, the last obtusely angulate 

 near the suture, base subplanate. Diam. 9, alt. 5'5 mill. 



New Caledonia. 

 D. VINITINCTA, Cox. PL 24, figs. 88, 89. 



Openly, deeply umbilicated, spire depressed, sunken; nautili- 

 form, thin, corneous, epidermis reddish chestnut, costulate. 

 Diam. 6'5, alt. 2-5 mill. 



Upper Richmond River, Australia. 



D. OMICRON, Pfr. PL 24, fig. 79. 



Umbilicated, spire profoundly immersed, umbilicus rather 

 wide, conical; very thin, closely filiformly striate, corneous, 

 obsoletely strigate with chestnut. Diam. 5*25, alt. 3 mill. 



Is Helix ammonitoides, Reeve. Australia- 



*** 

 D. LIFOUANA, Montrouzier. PL 25, figs. 93, 94. 



Nautiliform, minutely umbilicated, minutely striate, corneous, 

 epidermis olivaceous, subradiate with brown above ; last whorl 

 subangulate above, a little gibbous in the middle, more convex 

 below ; lip simple, whitish within the margin. 



Diam. 11, alt. 7 mill. Lifu Island, Loyalty Archipelago. 



