86 ADEORBIS. 



the suture, concavely flattened below, with the folds of the growth 

 striae very prominent, umbilicus wide, aperture large, basal. 

 Diam. 4'5 mill. 



Australia; Singapore (Archer). 



A. VINCENTIANUS, Angas. PI. 30, fig. 100. 



Widely umbilicated, rather thin, semipellucid, white ; whorls 3, 

 rapidly increasing, the last very large, convex, finely undulatelv 

 concentrically striated, obtusely keeled below the periphery, and 

 with a basal keel surrounding the umbilical region, which is slightly 

 crenated by rude growth-lines; aperture semilunar, the inner lip 

 nearly straight, sinuously angulated above. Diam. 6 mill. 



Aldinga Bay, St. Vincent's Gulf, Australia. 



A. SCABER, Phil. PI. 30, figs. 99 a, b. 



White, scabrous, with elevated, subserrated spiral lines above, 

 and sublamellar incremental lines below, whorls rapidly increasing, 

 the last with acutely angulated periphery. Diam. 3 mill. 



Panama. 



A. TENUILIRATUS, Smith. PL 30, figs. 1-3. 



Moderately umbilicated, yellowish, marked with spiral interrupted 

 lines and oblique radiating streaks of dark olivaceous, base yellowish 

 white, unicolored ; whorls 4, convex, rapidly increasing, with deep 

 suture, obliquely striate, and with thin spiral lirse ; aperture sub- 

 circular, receding at the base, whitish, showing the external mark- 

 ings. Diam. 3 mill. 



San Christoval, Solomon Is. 



I think this will prove to be a Trochus ; there are slight evidences 

 of pearly nacre on the specimens before me. 



Unfigured and doubtful species. 



A. COSTATUS, Garrett. Fossarus Garretti, Pease, Manual, ix, 272. 



A. VARIUS, Hutton. =Fossarina, Manual, ix, 276. 



A. ABJECTA, C. B. Ad. Fossarus, Manual, ix, 274. 



A. STRTATUS, Chemn. =Circulus striatus, Phil. 



A. IMPERSPICUUS, Monts. Sicily _ 



A. ORBIGNYI, Fischer. Cuba. 



A. FIMBRIATUS, Martens. New Guinea. 



A. PICTUS, Tenison-Woods. Tasmania. 



